Objective:

To determine the prevalence of cow's milk allergy and lactose intolerance in a sample of late adolescents.

Methods:

Through a population-based study, data corresponding to students with aged 15 to 18 years were analyzed.

Results:

A total of 1992 adolescents was analized. The revalence of cow's milk allergy was 1.4% (95% CI: 0.2% to 0.8%) and the revalence of lactose intolerance was 0.5% (95% CI: 0.2% to 0.8%). Adolescents with cow's milk allergy had fewer gastrointestinal symptoms (p = 0.036), but more skin (p < 0.001) and respiratory (p = 0.028) ailments than adolescents with lactose intolerance.

Conclusions:

The manifestations associated with cow's milk consumption in late adolescents seem to correspond mainly to cow's milk allergy than to lactose intolerance.

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