Abstract
The effects of varying the osmolality of liquid nutrient diets on the absorption of water, electrolytes, and carbohydrate from the small intestine were studied in Yucatan miniature swine. Pigs were killed and their gastrointestinal contents recovered at either 30 or 60 min after consuming liquid diets adjusted to 340, 450, 540, or 700 mOsm/kg and labeled with 3H2O, 22NaCl, U--14C-sucrose, and 51Cr-EDTA as a passage marker. Intragastric dilution and gastric emptying were not effected by diet osmolality. Gastric contents of all pigs converged toward 450 mOsm/kg, and osmolality of small intestine contents did not differ between diets. The absorption of carbohydrate, water, sodium, and potassium from jejunal contents increased with increasing osmolality of the diets. The rates of appearance of 3H, 22Na, and 14C in plasma also increased with increasing diet osmolality. These findings suggest that moderately hyperosmotic liquid diets may be beneficial, as compared with isoosmotic diets.
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