In 1967 Gryboski presented 21 children with chronic gastrointestinal allergies to milk which manifested as diarrhea 15/21, vomiting 5/21, vomiting and diarrhea 1/21 and colic 2/21. The symptoms improved when proteins causing the symptoms were eliminated from the diet and recurred when they were reintroduced.
Gryboski, en 1967 mostró 21 niños con alergia gastrointestinal después de la ingesta crónica de leche, manifestada como diarrea 15/21, vómito 5/21, vómito y diarrea 1/21 y cólico 2/21, los síntomas mejoraron cuando las proteínas causales se eliminaron de la dieta y recurrieron con su reintroducción.