Abstract
The concentrations of glucose and fructose in the portal vein and femoral artery were determined after gastric instillation of sucrose to six adult baboons. The animals were then given a high sucrose diet for nine weeks. The plasma levels of glucose and fructose after a sucrose meal were determined at intervals while on the diet and three weeks after the animals had returned to their standard diet. The concentration of fructose in the portal and femoral blood increased as a consequence of the high sucrose diet, whereas the level of glucose was not so affected. It is postulated that the high sucrose diet has increased the absorption rate of fructose across the gut. wall.

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