Low levels of intestinal lactase activity art: at the time of the study. The oldest was discharged found in many otherwise healthy adults and 8 years ago; the most recent, Iyear ago. children. Attention in recent years has fo.. Twenty-two were well-nourished siblings. This group was made up of the next-born siblings of cused on this problem in American Negroes the malnourished index cases. They were raised in (1-4), Asians (5-9), Bantu tribes (10), South a protected environment for the first 18 to 27 American Indians (11), Thais (12-14), and months of life 9nd then returned to their homes. other groups. Current evidence further in-During this initial period, they were given ideal g tdiets, with approximately one-half their calories dicates that low lactase levels are the norm and protein derived from milk. Their height at in the mnajority of adults in nmost populations the time of discharge ranged between the 3rd and of the world (15). 90th percentile, with the mean at the 25th. When In reasing consideration is being gi\,:n to studied, they were all between 10 months and 5 years of age, Another 50 children in the study were

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