Abstract
IN 1957 Borgstrom et al.1 introduced the use of un-absorbable polyethylene glycol (PEG) for quantitative investigations of absorption of fat, protein and carbohydrate from the intestine. Stimulated by their communication, a number of authors2–4 used PEG to examine absorption. (After the administration of PEG and a food mixture of known composition in the withdrawn specimen of the intestinal contents the PEG concentration and investigated nutrients are estimated. From the two values the percentage ratio of the absorbed nutrient is calculated.)
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