The survey on malabsorption of food in rural communities of Guatemala indicated that the experimental introduction of drinking water in a community resulted in a definite decline in the incidence of diarrhoea in children from 3 to 7 years of age. Longitudinal evaluation of the capacity of healthy men to absorb d-xylose revealed malabsorption in 30% of individuals living under poor sanitation conditions, as compared with 9% among those living under sanitation conditions which were better than those in rural areas. A definite improvement in d-xylose absorption was observed in the community where drinking water was introduced. Findings of longitudinal studies on intestinal absorption indicated that between 50 and 60 per cent of all the adult men were losing about 350 calories per day, a loss which, expressed in economic terms, is equivalent to 5-7 per cent of the cash cost of the diet.
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