<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0036-3634</journal-id>
<journal-title><![CDATA[Salud Pública de México]]></journal-title>
<abbrev-journal-title><![CDATA[Salud pública Méx]]></abbrev-journal-title>
<issn>0036-3634</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud Pública]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0036-36342005000400009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Trastornos de la conducta alimentaria como factor de riesgo para osteoporosis]]></article-title>
<article-title xml:lang="en"><![CDATA[Eating disorders as risk factors for osteoporosis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Gallardo]]></surname>
<given-names><![CDATA[Ma Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Parra-Cabrera]]></surname>
<given-names><![CDATA[Ma del Socorro]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barriguete-Meléndez]]></surname>
<given-names><![CDATA[Jorge Armando]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Fundación Ariwá para el Tratamiento, Prevención e Investigación de los Trastornos de la Conducta Alimentaria Grupo Médico Río Mayo ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Salud Pública Centro de Investigación en Nutrición y Salud ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán Departamento de Neurología y Psiquiatría Fundación Franco Mexicana para la Medicina]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2005</year>
</pub-date>
<volume>47</volume>
<numero>4</numero>
<fpage>308</fpage>
<lpage>318</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0036-36342005000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0036-36342005000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0036-36342005000400009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los trastornos de la conducta alimentaria son comunes en mujeres jóvenes con una prevalencia estimada de entre 4-5%. La pérdida de masa ósea es una complicación física de la anorexia nervosa y trastorno alimentario no especificado que afecta tanto a hueso cortical como trabecular. El efecto sinérgico de la desnutrición y la deficiencia de estrógenos produce una pérdida de masa ósea a través del desacoplamiento entre resorción osteoclástica y formación osteoblástica. La severidad varía dependiendo de la duración de la enfermedad, el peso menor alcanzado y la actividad física. La repercusión a largo plazo es evidente pues existe un incremento en el riesgo de fractura en las pacientes que han padecido anorexia nervosa. La primera línea de tratamiento para recuperar la masa ósea es la rehabilitación nutricia y un incremento de peso. La terapia de reemplazo hormonal podría ser efectiva si se combina con métodos anabólicos. Los términos osteopenia y osteoporosis fueron adoptados para definir la deficiencia de masa ósea en adultos. Los autores de las publicaciones que fueron revisadas utilizaron dichos términos para definir datos densitométricos en sujetos jóvenes que no han alcanzado la masa ósea pico. Sugerimos el término "hipo-osteogenesia" para definir el desarrollo deficiente de masa ósea en adolescentes o niños.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Eating disorders (TCA per its abbreviation in Spanish) are common in young women, with an estimated prevalence of 4-5%. One of the physical complications of eating disorders, especially anorexia nervosa (AN) and eating disorder not otherwise specified (TANE) is bone mass loss, which affects both cortical and trabecular bone. The synergistic effect of malnutrition and estrogen deficiency produces significant bone mass loss, resulting from the uncoupling of bone turnover characterized by a decrease in osteoblastic bone formation and an increase in osteclastic bone resorption. The mechanisms implied in the pathogenesis of bone loss are the hypoestrogenism, hypercortisolism, serum leptin levels and insulin-like growth factor decrease. Severity of bone loss in anorexia nervosa varies depending on duration of illness, the minimal weight ever and sedentarism or strenuous exercise. Long term consequences occur, such as a fracture risk increase in patients who have suffered anorexia nervosa, compared with the general population. The first treatment line to recover bone mass is nutritional rehabilitation together with weight gain. Hormonal replacement therapy may be effective if combined with an anabolic method. Osteopenia and osteoporosis are terms adopted to define the deficiency of bone mass in adults. Authors have used these terms to define densitometric data in young subjects who have not reached their peak bone mass. We suggest the term "hypo-osteogenesia" to define the deficiency in the development of bone mass in adolescents or children.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[pérdida de masa ósea]]></kwd>
<kwd lng="es"><![CDATA[anorexia nervosa]]></kwd>
<kwd lng="es"><![CDATA[trastorno alimentario no especificado]]></kwd>
<kwd lng="es"><![CDATA[terapia sustitutiva hormonal]]></kwd>
<kwd lng="es"><![CDATA[hipo-osteogenesia]]></kwd>
<kwd lng="en"><![CDATA[bone mass loss]]></kwd>
<kwd lng="en"><![CDATA[anorexia nervosa]]></kwd>
<kwd lng="en"><![CDATA[eating disorder not otherwise specified]]></kwd>
<kwd lng="en"><![CDATA[hormonal substitutive therapy]]></kwd>
<kwd lng="en"><![CDATA[hipo-osteogenesia]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana"> <b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="verdana"><b>Trastornos de la conducta alimentaria como    factor de riesgo para osteoporosis </b></font></p>     <p>&nbsp;</p>     <p><font size="3" face="verdana"><b>Eating disorders as risk factors for osteoporosis</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Ma Teresa Rivera-Gallardo, LN<SUP>I</SUP>;    Ma del Socorro Parra-Cabrera, Dr en C<SUP>II</SUP>; Jorge Armando Barriguete-Mel&eacute;ndez,    Psiq.<SUP>III</SUP></b></font></p>     <p><font size="2" face="Verdana"><sup>I</sup>Grupo M&eacute;dico R&iacute;o Mayo,    Fundaci&oacute;n Ariw&aacute; para el Tratamiento, Prevenci&oacute;n e Investigaci&oacute;n    de los Trastornos de la Conducta Alimentaria. Cuernavaca, Morelos, M&eacute;xico    <br>   <sup>II</sup>Centro de Investigaci&oacute;n en Nutrici&oacute;n y Salud, Instituto    Nacional de Salud P&uacute;blica. Cuernavaca, Morelos, M&eacute;xico    ]]></body>
<body><![CDATA[<br>   <sup>III</sup>Fundaci&oacute;n Franco Mexicana para la Medicina, Departamento    de Neurolog&iacute;a y Psiquiatr&iacute;a, Instituto Nacional de Ciencias M&eacute;dicas    y Nutrici&oacute;n Salvador Zubir&aacute;n. M&eacute;xico, DF</font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>RESUMEN</b></font></p>     <p><font size="2" face="Verdana">Los trastornos de la conducta alimentaria son    comunes en mujeres j&oacute;venes con una prevalencia estimada de entre 4-5%.    La p&eacute;rdida de masa &oacute;sea es una complicaci&oacute;n f&iacute;sica    de la anorexia nervosa y trastorno alimentario no especificado que afecta tanto    a hueso cortical como trabecular. El efecto sin&eacute;rgico de la desnutrici&oacute;n    y la deficiencia de estr&oacute;genos produce una p&eacute;rdida de masa &oacute;sea    a trav&eacute;s del desacoplamiento entre resorci&oacute;n osteocl&aacute;stica    y formaci&oacute;n osteobl&aacute;stica. La severidad var&iacute;a dependiendo    de la duraci&oacute;n de la enfermedad, el peso menor alcanzado y la actividad    f&iacute;sica. La repercusi&oacute;n a largo plazo es evidente pues existe un    incremento en el riesgo de fractura en las pacientes que han padecido anorexia    nervosa. La primera l&iacute;nea de tratamiento para recuperar la masa &oacute;sea    es la rehabilitaci&oacute;n nutricia y un incremento de peso. La terapia de    reemplazo hormonal podr&iacute;a ser efectiva si se combina con m&eacute;todos    anab&oacute;licos. Los t&eacute;rminos osteopenia y osteoporosis fueron adoptados    para definir la deficiencia de masa &oacute;sea en adultos. Los autores de las    publicaciones que fueron revisadas utilizaron dichos t&eacute;rminos para definir    datos densitom&eacute;tricos en sujetos j&oacute;venes que no han alcanzado    la masa &oacute;sea pico. Sugerimos el t&eacute;rmino "hipo-osteogenesia"    para definir el desarrollo deficiente de masa &oacute;sea en adolescentes o    ni&ntilde;os. </font></p>     <p><font size="2" face="Verdana"><b>Palabras clave:</b> p&eacute;rdida de masa    &oacute;sea; anorexia nervosa; trastorno alimentario no especificado; terapia    sustitutiva hormonal; hipo-osteogenesia</font></p> <hr size="1" noshade>     <p><font size="2" face="Verdana"> <b>ABSTRACT</b></font></p>     <p><font size="2" face="Verdana">Eating disorders (TCA per its abbreviation in    Spanish) are common in young women, with an estimated prevalence of 4-5%. One    of the physical complications of eating disorders, especially anorexia nervosa    (AN) and eating disorder not otherwise specified (TANE) is bone mass loss, which    affects both cortical and trabecular bone. The synergistic effect of malnutrition    and estrogen deficiency produces significant bone mass loss, resulting from    the uncoupling of bone turnover characterized by a decrease in osteoblastic    bone formation and an increase in osteclastic bone resorption. The mechanisms    implied in the pathogenesis of bone loss are the hypoestrogenism, hypercortisolism,    serum leptin levels and insulin-like growth factor decrease. Severity of bone    loss in anorexia nervosa varies depending on duration of illness, the minimal    weight ever and sedentarism or strenuous exercise. Long term consequences occur,    such as a fracture risk increase in patients who have suffered anorexia nervosa,    compared with the general population. The first treatment line to recover bone    mass is nutritional rehabilitation together with weight gain. Hormonal replacement    therapy may be effective if combined with an anabolic method. Osteopenia and    osteoporosis are terms adopted to define the deficiency of bone mass in adults.    Authors have used these terms to define densitometric data in young subjects    who have not reached their peak bone mass. We suggest the term "hypo-osteogenesia"    to define the deficiency in the development of bone mass in adolescents or children.    </font></p>     <p><font size="2" face="Verdana"><b>Key words:</b> bone mass loss; anorexia nervosa;    eating disorder not otherwise specified; hormonal substitutive therapy; hipo-osteogenesia</font></p> <hr size="1" noshade>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana"> Los trastornos de la conducta alimentaria (TCA)    son s&iacute;ndromes psiqui&aacute;tricos<SUP>1,2 </SUP>en los cuales la anorexia    nervosa (AN) se caracteriza por un miedo intenso a subir de peso, rechazo a    mantener el peso m&iacute;nimo esperado para la talla y edad, amenorrea y alteraci&oacute;n    en la percepci&oacute;n de la imagen corporal. Puede o no haber episodios de    "atrac&oacute;n" seguidos del uso de purgas o m&eacute;todos compensatorios.<SUP>1</SUP>    La bulimia nervosa (BN) presenta episodios de atrac&oacute;n y purgas, ejercicio    extenuante o ayunos, y el trastorno alimentario no especificado (TANE) es aplicable    a aquellas pacientes que a&uacute;n no re&uacute;nen todos los criterios diagn&oacute;sticos    para AN o BN.<SUP>1</SUP> A pesar de que esta clasificaci&oacute;n est&aacute;    sujeta a cr&iacute;ticas por sus definiciones tan estrechas,<SUP>3</SUP> y que    los s&iacute;ntomas se presentan a trav&eacute;s de un continuo entre los propios    de la AN y la BN,<SUP>4,5</SUP> facilita a los profesionales cl&iacute;nicos    hacer el diagn&oacute;stico de un TCA. </font></p>     <p><font size="2" face="Verdana"> La estimaci&oacute;n de la incidencia o prevalencia    de los TCA var&iacute;a dependiendo del tama&ntilde;o y edad de la muestra y    de los m&eacute;todos de evaluaci&oacute;n.<SUP>4,6</SUP> Estudios en Estados    Unidos de Am&eacute;rica y Europa Occidental encontraron una tasa de prevalencia    promedio de 0.3% para AN, de 1% para BN en mujeres j&oacute;venes y 0.1% para    BN en hombres j&oacute;venes.<SUP>7</SUP> En adolescentes espa&ntilde;olas se    ha reportado una prevalencia que fluct&uacute;a entre 0.3 y 0.45% para AN, 0.41    y 0.8% para BN, 3.1 y 4.71% para TANE; entre 4.1 y 5.17% de la poblaci&oacute;n    total sufre un TCA.<SUP>6,8</SUP> Los TCA se presentan con una raz&oacute;n    de prevalencia hombre/mujer de entre 1:6 y 1:10.<SUP>4,8</SUP> Respecto de la    incidencia de AN, la tasa global es de por lo menos 8 por 100 000 a&ntilde;os    persona<SUP>7,9</SUP> y de BN 12 por 100 000 a&ntilde;os persona.<SUP>7,10</SUP>    Para el grupo de mujeres de 15 a 24 a&ntilde;os de edad la incidencia se ha    incrementado el &uacute;ltimo siglo desde 1970.<SUP>7,9</SUP> En M&eacute;xico    no hay datos sobre la incidencia y prevalencia de los TCA en adolescentes pero    se ha detectado que 0.9% de los hombres y 2.8% de las mujeres en edad estudiantil    (12 a 19 a&ntilde;os), presentan alto riesgo de padecer un TCA;<SUP>11</SUP>    la encuesta nacional de epidemiolog&iacute;a psiqui&aacute;trica en M&eacute;xico,    en poblaci&oacute;n mayor de 18 a&ntilde;os, destac&oacute; una prevalencia    de bulimia de 0.6% en hombres y 1.8% en mujeres.<SUP>12 </SUP> </font></p>     <p><font size="2" face="Verdana"> La AN y BN est&aacute;n relacionadas con una    tasa de morbilidad de 33% despu&eacute;s de casi 12 a&ntilde;os de la primera    admisi&oacute;n en servicios hospitalarios; se han reportado tasas de mortalidad    estandarizada de 9.6, siendo las principales causas de muerte las arritmias    y enfermedades infecciosas.<SUP>13</SUP> </font></p>     <p><font size="2" face="Verdana"> El Consenso Mexicano de Osteoporosis de 2000    determina que "la osteoporosis es un trastorno esquel&eacute;tico generalizado    caracterizado por una masa &oacute;sea disminuida y deterioro de la calidad    del tejido &oacute;seo, con un aumento subsecuente en la fragilidad del hueso    y mayor riesgo de fractura".<SUP>14 </SUP>Los criterios diagn&oacute;sticos    fueron propuestos por la Organizaci&oacute;n Mundial de la Salud para evaluar    el riesgo de fractura de cadera en mujeres blancas cauc&aacute;sicas empleando    la medici&oacute;n de masa &oacute;sea con absorciometr&iacute;a dual de rayos-X.<SUP>15    </SUP>Sin embargo, estos criterios no deben emplearse para evaluar el riesgo    de fractura en ni&ntilde;os o adolescentes que todav&iacute;a no alcanzan su    masa &oacute;sea "pico", es decir, la densidad &oacute;sea m&aacute;xima    que se alcanza alrededor de los 20 y 30 a&ntilde;os de edad.<SUP>14</SUP> </font></p>     <p><font size="2" face="Verdana"> Un mecanismo efectivo para reducir el riesgo    de padecer osteoporosis en la edad adulta es alcanzar una masa &oacute;sea "pico"    m&aacute;xima durante la juventud.<SUP>16,17 </SUP>Alrededor de la mitad del    calcio &oacute;seo del adulto es depositado durante la adolescencia;<SUP>18    </SUP>por ello, la falla en la obtenci&oacute;n de suficiente densidad &oacute;sea    en los a&ntilde;os de m&aacute;xima formaci&oacute;n aumenta el riesgo de osteoporosis    y fracturas en la edad adulta.<SUP>19-21 </SUP>Durante esta ventana de oportunidad    para alcanzar una mineralizaci&oacute;n &oacute;sea &oacute;ptima, un alto porcentaje    de adolescentes mexicanas podr&iacute;a presentar TCA,<SUP>11 </SUP>lo que limitar&iacute;a    su desarrollo por diferentes v&iacute;as<SUP>21</SUP> y repercutir&iacute;a    a&ntilde;os m&aacute;s tarde en su salud &oacute;sea, como se muestra en la    figura 1. Los TCA pueden generar m&uacute;ltiples complicaciones que derivan    de la desnutrici&oacute;n, as&iacute; como del uso de purgas, lo que afecta    el sistemas cardiovascular, renal, gastrointestinal, endocrino, metab&oacute;lico    y, con mayor frecuencia, el esquel&eacute;tico.<SUP>22 </SUP>Por ello, en relaci&oacute;n    con el tema de TCA y su efecto en la densidad mineral &oacute;sea (DMO), los    autores presentar&aacute;n los hallazgos m&aacute;s importantes publicados hasta    el momento. </font></p>     <p><font size="2" face="Verdana"> El objetivo de este estudio fue realizar una    revisi&oacute;n cr&iacute;tica para identificar el efecto de los TCA en la densidad    mineral &oacute;sea a corto y largo plazo, describir los mecanismos endocrinos    y metab&oacute;licos involucrados, y las estrategias que hasta el momento se    han planteado para su tratamiento. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Material y m&eacute;todos </b></font></p>     <p><font size="2" face="Verdana">Se revis&oacute; la literatura internacional    para un periodo de 20 a&ntilde;os (1984 - 2004) con el objetivo de obtener art&iacute;culos    que informaran sobre TCA y osteoporosis; para esto se utilizaron medios digitales    (Medline) y el servicio mensual de Biomail bajo los siguientes t&iacute;tulos:    Osteoporosis AND eating disorders, estrogen replacement therapy in AN, hormone    therapy in AN y IGF-1 Therapy in AN. Se identificaron 153 art&iacute;culos y    luego se seleccionaron 102 por estar directamente relacionados con el tema.    Los 51 restantes se descartaron por su relaci&oacute;n con amenorrea hipotal&aacute;mica    en atletas, y terapia de remplazo hormonal en la perimenopausia. </font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="3" face="Verdana"><b> Resultados </b></font></p>     <p><font size="2" face="Verdana"><b>Trastornos de la conducta alimentaria asociados    con osteoporosis </b></font></p>     <p><font size="2" face="Verdana">La p&eacute;rdida de DMO es una complicaci&oacute;n    potencialmente cr&oacute;nica de la AN<SUP>23-37 </SUP>y TANE,<SUP>36 </SUP>que    en ocasiones ha sido suficiente para ocasionar fracturas patol&oacute;gicas    ante trauma m&iacute;nimo,<SUP>34,38-43 </SUP>as&iacute; como un retraso en    el crecimiento tanto en mujeres<SUP>44-46</SUP> como en hombres adolescentes.<SUP>47    </SUP>Se ha llegado a estimar una p&eacute;rdida de estatura de 3 cm en relaci&oacute;n    con la esperada en mujeres adolescentes con AN.<SUP>48 </SUP>Esto por la alteraci&oacute;n    en la funci&oacute;n de la hormona de crecimiento y niveles bajos del factor    de crecimiento parecido a la insulina (FCI-1).<SUP>49,50 </SUP> </font></p>     <p><font size="2" face="Verdana"> Se ha comprobado una DMO &oacute;sea disminuida    en columna lumbar,<SUP>24-36,51-58</SUP> cuello femoral,<SUP>25-27,36,52,53,56</SUP>    radio distal,<SUP>37,56</SUP> calc&aacute;neo, cuerpo entero<SUP>29</SUP> y    cadera total<SUP>51,52,54 </SUP>en mujeres; y en columna lumbar, cuello femoral<SUP>59-61</SUP>    y cuerpo entero en hombres con AN.<SUP>61 </SUP>Por su mayor actividad metab&oacute;lica,    la p&eacute;rdida ocurre en hueso trabecular antes que en cortical,<SUP>25,62,63</SUP>    lo que registra p&eacute;rdidas anuales de masa &oacute;sea lumbar de entre    2 y 10%.<SUP>31,64-66</SUP> Diversos estudios han encontrado que la utilizaci&oacute;n    de purga en la AN no incrementa la p&eacute;rdida de DMO.<SUP>28,32,37,51,67    </SUP>Karlsson y su equipo<SUP>68</SUP> se&ntilde;alan que el desconocimiento    del efecto del tama&ntilde;o de los huesos en las expresiones de densidad o    masa &oacute;sea puede ocasionar inferencias err&oacute;neas acerca de la patog&eacute;nesis    de la fragilidad &oacute;sea. </font></p>     <p><font size="2" face="Verdana"> Respecto de BN, &uacute;nicamente cuando hay    antecedentes de anorexia nervosa presentan DMO disminuida.<SUP>31,32,69-71</SUP>    En algunos hombres con BN se ha detectado una DMO disminuida en columna lumbar.<SUP>60</SUP>    </font></p>     <p><font size="2" face="Verdana"> En lo relativo a TANE se ha encontrado una disminuci&oacute;n    de DMO en columna lumbar, radio distal y f&eacute;mur,<SUP>36 </SUP>con un incremento    en el riesgo de fractura durante varios a&ntilde;os despu&eacute;s del diagn&oacute;stico    del TANE.<SUP>72</SUP> </font></p>     <p><font size="2" face="Verdana"><b>Trastornos endocrinos y metab&oacute;licos    que influyen en la sintomatolog&iacute;a de los TCA </b></font></p>     <p><font size="2" face="Verdana">La mayor&iacute;a de los trastornos endocrinos    y metab&oacute;licos en los TCA son secundarios al estado de inanici&oacute;n    y p&eacute;rdida de peso, a la conducta purgativa o al estr&eacute;s psicol&oacute;gico.<SUP>73    </SUP>Existen alteraciones en el eje hipot&aacute;lamopituitaria-ovarios, adrenal    y tiroideo as&iacute; como en la hormona de crecimiento, insulina, neurop&eacute;ptidos,    opioides, leptina y neurotransmisores.<SUP>73 </SUP>Estas anormalidades desaparecen    con la realimentaci&oacute;n y ganancia de peso.<SUP>74 </SUP>La hormona liberadora    de corticotropina, algunos neurop&eacute;ptidos, la dopamina y opioides end&oacute;genos    se han propuesto como factores perpetuantes de la conducta anor&eacute;ctica;    en consecuencia, la desnutrici&oacute;n puede contribuir al c&iacute;rculo vicioso    sosteniendo y perpetuando el deseo para adelgazar m&aacute;s y hacer dieta.<SUP>74</SUP>    </font></p>     <p><font size="2" face="Verdana"><b>Mecanismos que desencadenan la deficiencia    de la DMO en la AN </b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">El efecto sin&eacute;rgico de la desnutrici&oacute;n    y la deficiencia de estr&oacute;genos produce una p&eacute;rdida singnificativa    de hueso<SUP>75,76</SUP> a trav&eacute;s de un desacoplamiento entre resorci&oacute;n    osteocl&aacute;stica y formaci&oacute;n osteobl&aacute;stica,<SUP>28,29,53-55,58,77-80</SUP>    espec&iacute;ficamente cuando el IMC est&aacute; por debajo de 16.4 kg/cm<SUP>2</SUP>.<SUP>67    </SUP>Una p&eacute;rdida generalizada de col&aacute;geno seguida del hipoestrogenismo    es el factor etiol&oacute;gico m&aacute;s importante para la p&eacute;rdida    de masa &oacute;sea en la AN.<SUP>24</SUP> El     FCI-1 es una potente hormona osteotr&oacute;pica,<SUP>81 </SUP>y un indicador    del estado nutricio en pacientes con TCA<SUP>50,82 </SUP>se encuentra disminuido    en mujeres con AN,<SUP>28,50,57,79,82-84</SUP> y su ausencia en las c&eacute;lulas    del hueso ejerce un efecto da&ntilde;ino en la funci&oacute;n del osteoblasto.<SUP>37    </SUP>Los niveles s&eacute;ricos del FCI-1 aumentan con la ganancia de peso<SUP>85,86</SUP>    y con la realimentaci&oacute;n,<SUP>79,82,87,88</SUP> prediciendo la recuperaci&oacute;n    de la masa &oacute;sea en estudios longitudinales.<SUP>85,86</SUP> La deficiencia    de estr&oacute;genos puede ser responsable del d&eacute;ficit en la DMO volum&eacute;trica    (g/cm<SUP>3</SUP>) tanto en columna lumbar y cuello femoral, mientras que la    desnutrici&oacute;n puede ocasionar un d&eacute;ficit en el ancho del cuello    femoral y cuerpo vertebral.<SUP>68</SUP> </font></p>     <p><font size="2" face="Verdana"> La leptina<SUP>88,89</SUP> puede actuar como    factor protector inhibiendo la resorci&oacute;n.<SUP>90-93</SUP> La disminuci&oacute;n    dram&aacute;tica en los niveles de leptina que se observan en la AN<SUP>84,88</SUP>    pueden generar la p&eacute;rdida de hueso a trav&eacute;s de una disminuci&oacute;n    en las tasas de formaci&oacute;n de hueso cortical.<SUP>89 </SUP>Adem&aacute;s,    la correlaci&oacute;n entre la leptina y los marcadores de resorci&oacute;n    &oacute;sea en pacientes con AN durante el proceso de realimentaci&oacute;n,    sugiere una relaci&oacute;n de causa-efecto entre concentraciones de leptina    y el proceso de formaci&oacute;n &oacute;sea.<SUP>79</SUP> </font></p>     <p><font size="2" face="Verdana"> Los niveles bajos de triyodotironina en algunas    pacientes tambi&eacute;n pueden estar involucrados en la p&eacute;rdida de masa    &oacute;sea. Esto debido a que las hormonas tiroideas tienen efectos sobre el    cart&iacute;lago del crecimiento estimulando la mineralizaci&oacute;n de la    matriz, as&iacute; como la formaci&oacute;n y resorci&oacute;n &oacute;seas.<SUP>90    </SUP> </font></p>     <p><font size="2" face="Verdana"> El hipercorticismo tambi&eacute;n tiene influencia.<SUP>94    </SUP>Aunque se observa &uacute;nicamente en una minor&iacute;a de casos con    osteopenia severa,<SUP>57,95 </SUP>y esto es un indicio de que la p&eacute;rdida    de DMO no es ocasionada por este mecanismo en la mayor&iacute;a de las pacientes,    quienes lo presentan tienen un mayor d&eacute;ficit en la formaci&oacute;n &oacute;sea<SUP>83</SUP>    y p&eacute;rdida severa de DMO vertebral.<SUP>28,33</SUP> Los niveles de hormona    paratiroidea se encuentran normales, por ello se descarta la posibilidad de    que el hipercorticismo contribuya al deterioro de la masa &oacute;sea v&iacute;a    hiperparatiroidismo secundario.<SUP>28 </SUP>La ganancia de peso produce una    disminuci&oacute;n en los niveles de cortisol s&eacute;rico y un aumento subsecuente    en marcadores de formaci&oacute;n &oacute;sea relacionado directamente con el    incremento en FCI-1.<SUP>83</SUP> </font></p>     <p><font size="2" face="Verdana"> En cuanto a los factores diet&eacute;ticos,    la ingesti&oacute;n de calcio y vitamina D en mujeres con AN puede ser muy baja<SUP>29,37,62</SUP>    ya que los l&aacute;cteos se perciben como alimentos grasos.<SUP>20,62</SUP>    Adem&aacute;s, el hipoestrogenismo puede generar un aumento en el requerimiento    de calcio<SUP>56</SUP> y la acidosis metab&oacute;lica, una consecuencia del    deterioro nutricio, estimula directamente la liberaci&oacute;n de calcio del    tejido &oacute;seo. Si &eacute;sta resulta prolongada, inhibe la actividad osteobl&aacute;stica    y estimula la osteocl&aacute;stica.<SUP>96,97</SUP> Una ingesti&oacute;n menor    a 600 mg diarios de calcio se considera una variable m&aacute;s implicada en    la osteopenia en mujeres adolescentes.<SUP>25 </SUP>Sin embargo, algunos autores    no han encontrado asociaci&oacute;n entre la ingesti&oacute;n de calcio o vitamina    D consumidos a partir de la dieta y la DMO,<SUP>29,37,51,98</SUP> posiblemente    porque el periodo de evaluaci&oacute;n ha sido corto.<SUP>99 </SUP> </font></p>     <p><font size="2" face="Verdana"><b>Factores de riesgo cl&iacute;nico en pacientes    con AN </b></font></p>     <p><font size="2" face="Verdana">La p&eacute;rdida de DMO est&aacute; relacionada    negativamente con el peso,<SUP>51,54</SUP> es decir, a menor peso alcanzado<SUP>53,100,101    </SUP>y mayor tiempo de permanencia en &eacute;ste,<SUP>67 </SUP>mayor p&eacute;rdida    de masa &oacute;sea se tendr&aacute;. La p&eacute;rdida de masa magra es un    factor pron&oacute;stico importante para la p&eacute;rdida de masa &oacute;sea,<SUP>102    </SUP>con una correlaci&oacute;n significativa entre &eacute;sta y la DMO lumbar<SUP>103,104</SUP>    y total.<SUP>103 </SUP>El peso es tambi&eacute;n un factor pron&oacute;stico    de la recuperaci&oacute;n, pues se ha visto que el incremento de peso por a&ntilde;o    es mayor si el IMC menor alcanzado es &gt; 16.4 kg/m<SUP>2</SUP>.<SUP>67 </SUP>Por    su parte, aquellas pacientes que logran un IMC mayor a 19 cuando son dadas de    alta en cl&iacute;nicas especializadas, tienen una DMO mayor unos a&ntilde;os    despu&eacute;s que quienes no alcanzaron este peso.<SUP>105</SUP> </font></p>     <p><font size="2" face="Verdana"> La duraci&oacute;n de la enfermedad es un factor    predictivo de DMO trabecular<SUP>25,28,30,32,61,98</SUP> y la mejor variable    para predecir DMO cortical.<SUP>98 </SUP>Doce meses despu&eacute;s del inicio    de la AN la DMO ya se encuentra disminuida.<SUP>25,103 </SUP> </font></p>     <p><font size="2" face="Verdana"> Algunos autores han encontrado que si la AN    comienza antes de la menarca<SUP>56,66</SUP> se tiene un peor pron&oacute;stico    para la DMO lumbar en la edad adulta, mientras que otros<SUP>72 </SUP>han detectado    que mujeres diagnosticadas con AN despu&eacute;s de los 20 a&ntilde;os de edad    tienen mayor incidencia de fracturas, comparadas con aquellas diagnosticadas    en edades m&aacute;s tempranas. </font></p>     <p><font size="2" face="Verdana"> El ejercicio se considera un factor protector    de DMO en pacientes con AN.<SUP>25,26,32,38,54</SUP> Sin embargo, hecho de manera    extenuante, tiene un efecto perjudicial.<SUP>36,71 </SUP>El ejercicio "contra-peso"    puede compensar los efectos del hipogonadismo, predominantemente en zonas de    hueso cortical que soportan carga.<SUP>38,106</SUP> Algunos autores<SUP>29,98,100    </SUP>no han encontrado correlaci&oacute;n entre ejercicio y DMO quiz&aacute;    porque los periodos de evaluaci&oacute;n han sido breves.<SUP>107 </SUP> </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"><b>Tratamiento farmacol&oacute;gico para la osteopenia    en la AN </b></font></p>     <p><font size="2" face="Verdana">La ganancia de peso juega un papel crucial para    la recuperaci&oacute;n de la masa &oacute;sea<SUP>29,31,66,67,78,79,108</SUP>    y restablece el desacoplamiento del remodelado &oacute;seo;<SUP>80 </SUP>por    lo tanto, la terapia nutricional es esencial<SUP>79,99,109</SUP> y efectiva    para incrementar marcadores de formaci&oacute;n    &oacute;sea.<SUP>88 </SUP>El entendimiento de los procesos fisiopatol&oacute;gicos    implicados en la p&eacute;rdida de masa &oacute;sea en la AN, ha dado pie a    la implementaci&oacute;n de tratamientos farmacol&oacute;gicos que busquen frenar    o disminuir el d&eacute;ficit.<SUP>65,66,103,110,111</SUP> </font></p>     <p><font size="2" face="Verdana"> La eficacia absoluta del tratamiento con remplazo    hormonal en pacientes con AN no se ha demostrado.<SUP>26,65,68,112,113</SUP>    Su efecto no ha sido suficiente para reducir la p&eacute;rdida de masa &oacute;sea    cuando se ha suplementado por periodos entre 9 y 18 meses, como se muestra en    el cuadro I. La efectividad de los estr&oacute;genos para incrementar o preservar    la DMO en mujeres con AN est&aacute; mitigada por la desnutrici&oacute;n continua,<SUP>51    </SUP>pues la DMO en columna lumbar<SUP>51,58</SUP> y cadera total<SUP>51 </SUP>en    mujeres con AN que toman anticonceptivos orales, no es diferente de aqu&eacute;llas    que no los ingieren. </font></p>     <p><font size="2" face="Verdana"> En el cuadro II se listan otras estrategias    farmacol&oacute;gicas estudiadas para el tratamiento de la p&eacute;rdida de    masa &oacute;sea. El tratamiento combinado que llev&oacute; a cabo Grinspoon    y su equipo,<SUP>104 </SUP>logr&oacute; un incremento significativo de DMO lumbar    en donde la terapia de remplazo hormonal potencializ&oacute; el efecto anab&oacute;lico    del FCI-1. </font></p>     <p><font size="2" face="Verdana"> Respecto de la suplementaci&oacute;n con calcio,    aunque existen evidencias de que 1000 mg de calcio diarios en adolescentes sanas    puede elevar la DMO en columna dentro de los primeros seis meses de tratamiento,<SUP>114    </SUP>en pacientes con AN no se ha observado beneficio.<SUP>29,102 </SUP> </font></p>     <p><font size="2" face="Verdana"><b>Repercusi&oacute;n de la p&eacute;rdida de    masa &oacute;sea a largo plazo en la AN </b></font></p>     <p><font size="2" face="Verdana">Existen pruebas de que la osteopenia persiste    a&uacute;n despu&eacute;s de la recuperaci&oacute;n del peso y la menstruaci&oacute;n<SUP>27,68,115</SUP>    pues la recuperaci&oacute;n de la DMO es muy lenta,<SUP>27,31,116</SUP> especialmente    en hueso cortical.<SUP>37,98,99</SUP> Despu&eacute;s de casi 12 a&ntilde;os    de la primera admisi&oacute;n,<SUP>98 </SUP>y 25 a&ntilde;os despu&eacute;s    de una recuperaci&oacute;n completa,<SUP>115 </SUP>no se logran reponer las    p&eacute;rdidas. </font></p>     <p><font size="2" face="Verdana"> Varios estudios han afirmado que la DMO se normaliza    despu&eacute;s de la recuperaci&oacute;n, pero no han incluido una medici&oacute;n    inicial con la cual se haya podido establecer alguna comparaci&oacute;n.<SUP>61,108,117    </SUP>Las adolescentes j&oacute;venes con un curso de enfermedad corto (17 meses),    y que logran una recuperaci&oacute;n adecuada del peso (IMC&gt;19), tienen un    incremento de la DMO tres veces mayor que la ganancia observada en las adolescentes    sanas. Por ello, se piensa que este grupo pudiera tener mayores posibilidades    de recuperaci&oacute;n.<SUP>64 </SUP>Sin embargo, existe un incremento en el    riesgo de fractura en las pacientes con AN despu&eacute;s de un a&ntilde;o del    diagn&oacute;stico y por m&aacute;s de 10 a&ntilde;os despu&eacute;s de &eacute;ste,<SUP>72    </SUP>siendo 2.9 veces  mayor en mujeres    que han sufrido AN que en la poblaci&oacute;n general. Esto se ha presentado    con una frecuencia mayor en fractura de cadera, columna y radio distal, y ha    ocurrido en promedio a los 38, 25 y 24 a&ntilde;os despu&eacute;s del diagn&oacute;stico,    respectivamente, con una incidencia acumulativa de 57% para cualquier fractura,    40 a&ntilde;os despu&eacute;s del diagn&oacute;stico.<SUP>102</SUP> </font></p>     <p><font size="2" face="Verdana"><b>Recomendaciones para el tratamiento de la    osteopenia en la AN </b></font></p>     <p><font size="2" face="Verdana">A pesar de que no existen estudios que comprueben    la eficacia de la suplementaci&oacute;n con calcio y vitamina D, &eacute;sta    se recomienda para quienes no cumplan con las ingestiones diet&eacute;ticas    de referencia de calcio,<SUP>62,66</SUP> de entre 1 000 y 1 500 mg diarios<SUP>109,118,119    </SUP>junto con 400 a 600 UI de vitamina D<SUP>62,66,109</SUP> y un r&eacute;gimen    de ejercicio moderado<SUP>49,54,62 </SUP>del tipo "de carga de peso"<SUP>62</SUP>    junto con la recuperaci&oacute;n del peso.<SUP>49 </SUP> </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"> La decisi&oacute;n de suplementar con estr&oacute;genos    debe ser individualizada<SUP>104</SUP> y, dado el riesgo potencial de fractura    y el hecho de que la AN es frecuentemente refractaria al tratamiento, la terapia    sustitutiva hormonal para las pacientes adultas o en la adolescencia tard&iacute;a    no debe ser completamente abandonada.<SUP>23,120</SUP> Una desventaja de este    tratamiento es que va a enmascarar el momento cuando el cuerpo ha llegado a    una recuperaci&oacute;n biol&oacute;gica, dando un falso sentido de seguridad    a las mujeres que a&uacute;n se encuentran en un peso bajo y est&aacute;n teniendo    ciclos menstruales regulares.<SUP>65,119</SUP> </font></p>     <p><font size="2" face="Verdana"> La densitometr&iacute;a es un instrumento &uacute;til    para identificar y advertir a las pacientes que se encuentran por debajo del    valor esperado para su edad; asimismo, provee una oportunidad para hacer constar    a la paciente sobre los efectos a largo plazo del peso bajo.<SUP>63,109</SUP>    Debe indicarse cuando se tiene un IMC&lt; 15 una ingesti&oacute;n de calcio    menor a 600 mg diarios, una duraci&oacute;n del trastorno mayor a 12 meses o    una duraci&oacute;n de amenorrea mayor a seis meses,<SUP>23,25,63 </SUP>y repetirse    cada dos a&ntilde;os hasta la recuperaci&oacute;n del peso y de ciclos menstruales    regulares,<SUP>23 </SUP>o cada a&ntilde;o si hay un incremento peque&ntilde;o    y constante de peso.<SUP>63</SUP> </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Conclusiones </b></font></p>     <p><font size="2" face="Verdana">La AN es el padecimiento m&aacute;s susceptible    de presentar DMO disminuida. El TANE y la BN tambi&eacute;n son grupos vulnerables,    el primero porque puede representar un periodo precl&iacute;nico de la AN, y    el segundo porque es com&uacute;n que se presente con antecedentes de AN. El    efecto se hace evidente en hueso trabecular, antes que cortical. </font></p>     <p><font size="2" face="Verdana"> El grado de deficiencia de masa &oacute;sea    est&aacute; relacionado con la severidad de la AN en funci&oacute;n de su duraci&oacute;n    y el grado de p&eacute;rdida de peso. No se tiene claro si la edad de inicio    de la enfermedad, independientemente de su duraci&oacute;n, tiene un efecto    en la DMO. El sedentarismo se identific&oacute; como un factor de riesgo para    deterioro del desarrollo de la masa &oacute;sea; se habla incluso de que el    ejercicio "contra peso" neutraliza los efectos del hipogonadismo en    zonas de hueso que soportan carga. Sin embargo, se requieren estudios que eval&uacute;en    esta variable a largo plazo para determinar la frecuencia e intensidad adecuadas,    y el momento oportuno dentro del proceso    de recuperaci&oacute;n en que debe iniciarse sin que &eacute;ste interfiera    con la ganancia de peso. </font></p>     <p><font size="2" face="Verdana"> Los mecanismos implicados en la patog&eacute;nesis    de la deficiencia de DMO son el hipoestrogenismo, hipercorticismo, concentraciones    bajas de leptina, triyodotironina y FCI-1. En cuanto a factores diet&eacute;ticos    como ingesti&oacute;n de calcio y vitamina D no se encontr&oacute; correlaci&oacute;n    con la DMO porque los periodos de evaluaci&oacute;n no fueron suficientemente    largos.<SUP>107 </SUP>La acidosis metab&oacute;lica, consecuencia de la inanici&oacute;n,    se supone tambi&eacute;n como factor etiol&oacute;gico importante. </font></p>     <p><font size="2" face="Verdana"> La repercusi&oacute;n cl&iacute;nica del deterioro    de la DMO en relaci&oacute;n con el incremento en el riesgo de fractura en la    vida futura es un dato claro que confirma a la AN como factor de riesgo para    osteoporosis en la vida adulta, y hace evidente la necesidad de incluir en los    cuestionarios que actualmente se realizan en campa&ntilde;as masivas de identificaci&oacute;n    de adultos en riesgo de padecer osteoporosis, el antecedente de TCA en sus a&ntilde;os    adolescentes y su perpetuaci&oacute;n en la adultez. </font></p>     <p><font size="2" face="Verdana"> En cuanto a la salud &oacute;sea, el tratamiento    de la AN es complejo debido al curso cr&oacute;nico del trastorno y a la resistencia    com&uacute;n que se presenta al cambio. Algunas de las alteraciones hormonales    y endocrinas que derivan de la inanici&oacute;n, p&eacute;rdida de peso, conducta    purgativa o estr&eacute;s intervienen en la perpetuaci&oacute;n de los s&iacute;ntomas    a trav&eacute;s de la alteraci&oacute;n del apetito, saciedad y estado de &aacute;nimo    haciendo sumamente dif&iacute;cil la recuperaci&oacute;n en t&eacute;rminos    de la realimentaci&oacute;n y el incremento de peso, que es el factor principal    para el restablecimiento del desacoplamiento en el remodelado &oacute;seo. Esto,    aunado a la falta de estrategias farmacol&oacute;gicas adecuadas para contrarrestar    el desarrollo insuficiente de la masa &oacute;sea, impide dar un tratamiento    eficaz. </font></p>     <p><font size="2" face="Verdana"> La efectividad de la terapia de remplazo hormonal    para aumentar la DMO en mujeres con AN no se ha demostrado. La decisi&oacute;n    de utilizarla en la edad adulta o adolescencia tard&iacute;a debe ser individualizada.    La terapia sustitutiva hormonal combinada con la suplementaci&oacute;n de FCI-1    puede tener un efecto sin&eacute;rgico, como lo comprobaron Grinspoon y su equipo.<SUP>104    </SUP>La intervenci&oacute;n con este m&eacute;todo no es &uacute;til porque    requiere de un monitoreo constante de la glicemia. </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"> Para lograr la recuperaci&oacute;n del estado    de nutrici&oacute;n y del peso es necesaria la integraci&oacute;n de la atenci&oacute;n    psicol&oacute;gica, psiqui&aacute;trica, m&eacute;dica y de nutrici&oacute;n.    Al momento, s&oacute;lo se han sugerido medidas generales para el tratamiento    del desarrollo deficiente de masa &oacute;sea. Se recomienda la recuperaci&oacute;n    del peso corporal, ingesti&oacute;n adecuada de vitamina D y calcio, as&iacute;    como un r&eacute;gimen de ejercicio moderado del tipo "contra peso".    Es necesario dise&ntilde;ar estrategias farmacol&oacute;gicas que a la par de    estas medidas logren optimizar el desarrollo de la masa &oacute;sea para reponer    las deficiencias que en su momento fueron ocasionadas por el TCA. Es importante    que el equipo multidisciplinario preste atenci&oacute;n especial a las pacientes    anor&eacute;cticas con una duraci&oacute;n de la amenorrea mayor a seis meses,    un IMC menor a 15 kg/m<SUP>2</SUP> o una ingesti&oacute;n de calcio menor a    600 mg diarios. Cuando alguna de estas condiciones est&aacute; presente el riesgo    de presentar deficiencia en el desarrollo de la masa &oacute;sea es alto, por    consiguiente se debe indicar un estudio densitom&eacute;trico. </font></p>     <p><font size="2" face="Verdana"> Por otra parte, el deterioro de la masa &oacute;sea    que inducen los TCA en adolescentes o adultos j&oacute;venes que a&uacute;n    no alcanzan el pico de masa &oacute;sea, es decir, la acumulaci&oacute;n m&aacute;xima    de los componentes de la estructura de los huesos, representa el grado de ineficiencia    para alcanzar dicha caracter&iacute;stica de las reservas del esqueleto. Los    autores de las publicaciones consultadas utilizaron los t&eacute;rminos osteoporosis    y osteopenia por la popularidad de la clasificaci&oacute;n de la OMS; sin embargo,    no son aplicables para definir datos densitom&eacute;tricos de poblaciones j&oacute;venes    que no han alcanzado su reserva &oacute;sea pico. M&aacute;s a&uacute;n, esto    es una limitaci&oacute;n para ser capaces de proporcionar un enfoque claro al    efecto de los TCA en la salud &oacute;sea en poblaciones j&oacute;venes. En    la actualidad, no existe consenso entre expertos ni una nomenclatura aceptada    que le d&eacute; nombre propio a las deficiencias en el desarrollo de la reserva    &oacute;sea antes de que &eacute;sta alcance su m&aacute;xima concentraci&oacute;n.    Por ello, se considera relevante asignar un nombre a este trastorno diferente    a la osteoporosis en la adultez. La palabra "hipo-osteogenesia" lo    define de forma correcta, independientemente del padecimiento que lo ocasione.    La ra&iacute;z griega "genesia" significa producci&oacute;n,<SUP>121    </SUP>por lo tanto al a&ntilde;adir el prefijo "hipo" estar&iacute;amos    refiri&eacute;ndonos a una producci&oacute;n o desarrollo deficiente del tejido    &oacute;seo. Asimismo, para definir la hipo-osteogenesia de muy mal pron&oacute;stico    en la AN cr&oacute;nica, se agregar&iacute;a el adjetivo "ominosa",    del lat&iacute;n "ominosus" para denominarla como "hipo-osteogenesia    ominosa de la AN". </font></p>     <p><font size="2" face="Verdana"> La Encuesta Nacional de Epidemiolog&iacute;a    Psiqui&aacute;trica del Instituto Nacional de Psiquiatr&iacute;a Ram&oacute;n    de la Fuente Mu&ntilde;iz, cuyo blanco fue la poblaci&oacute;n no institucionalizada    mayor de 18 a&ntilde;os, ya incluy&oacute; datos sobre TCA y detect&oacute;    una prevalencia de bulimia nervosa de 6% en hombres y 1.8% en mujeres.<SUP>12    </SUP>Sin embargo, para tener una visi&oacute;n clara de la magnitud del da&ntilde;o    que ocasionan y emprender programas preventivos, las futuras l&iacute;neas de    investigaci&oacute;n en M&eacute;xico deber&aacute;n enfocarse, en primer t&eacute;rmino,    en investigar la prevalencia e incidencia de los TCA en una muestra que incluya    adolescentes. Adem&aacute;s, deben hacerse estudios    prospectivos a largo plazo que permitan aclarar los mecanismos implicados en    la patog&eacute;nesis de la "hipo-osteogenesia" para dise&ntilde;ar    estrategias de intervenci&oacute;n adecuadas. Es indispensable evaluar el efecto    de estrategias combinadas con estr&oacute;genos y m&eacute;todos anab&oacute;licos    en la recuperaci&oacute;n de la masa &oacute;sea. El entendimiento de las alteraciones    en algunos sistemas de neurop&eacute;ptidos que intervienen en la conducta alimentaria    ayudar&aacute;n a aclarar su influencia en la resistencia al tratamiento, as&iacute;    como su posible participaci&oacute;n en la etiolog&iacute;a de la AN y BN.<SUP>74    </SUP>El an&aacute;lisis gen&eacute;tico de la AN ayudar&aacute; a identificar    nuevas estrategias de medicaci&oacute;n y tratamiento.<SUP>89 </SUP></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Agradecimientos </b></font></p>     <p><font size="2" face="Verdana">Agradecemos al Dr. Edmundo Calva, investigador    titular del Instituto de Biotecnolog&iacute;a de la UNAM, por su apoyo para    la recolecci&oacute;n de diversos art&iacute;culos. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Referencias </b></font></p>     <!-- ref --><p><font size="2" face="Verdana">1. American Psychiatric Association. 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<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana">Fecha de recibido: 30 de noviembre de 2004    <br>   Fecha de aprobado: 8 de julio de 2005 </font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Solicitud de sobretiros: Ma Teresa Rivera Gallardo.    Avenida R&iacute;o Mayo 1306 interior 101, colonia Vista Hermosa 62290. Cuernavaca,    Morelos, M&eacute;xico. Correo electr&oacute;nico:    <a href="mailto:terenut@prodigy.net.mx">terenut@prodigy.net.mx</a> </font></p>      ]]></body><back>
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