EFFECTS OF YOGURT AND FERMENTED-THEN-PASTEURIZED MILK ON LACTOSE ABSORPTION IN AN INSTITUTIONALIZED ELDERLY GROUP

In the present study we evaluated lactose malabsorption (LM) after ing estion of three dairy products in 53 healthy institutionalized elderly people. A preliminary screening with milk (250 ml, 11 g lactose) was carried out to select the LM subjects using the H2 breath test. The ef fect of consuming an equivalent amount of lactose contained in yogurt and fermented-then-pasteurized milk (FPM) was then assessed in LM subj ects. Results indicated that 36% of the elderly population studied was considered as LM and that breath H2 excretion was significantly highe r after ingestion of milk than after ingestion of yogurt. This benefic ial effect was partially eliminated when FPM was tested. Moreover, bre ath H2 excretion was significantly higher (p < 0.05) 3 hours after ing estion of FPM compared to the normal yogurt. These results demonstrate a high prevalence of LM in the elderly and confirm the positive effec t of yogurt on lactose absorption, whereas pasteurized yogurt did not cause the same effect.