Inhibitory effect of soybean protein vs. casein on apparent absorption of magnesium in rats is due to greater excretion of endogenous magnesium

Article Abstract:

The result of soybean protein and casein ingestion on apparent magnesium absorption in rats was investigated. Rats were fed experimental diets containing varying levels of soybean protein, casein, lactose and phosphate for 13 days and magnesium was subsequently administered until the 21st day. Results indicated that true magnesium absorption remained constant although apparent magnesium absorption was decreased by soybean protein and phytate, probably by increasing fecal excretion of endogenous magnesium. Lactose stimulated magnesium absorption and urinary excretion. The increased fecal excretion may be due to pH changes or epithelial turnover.

Soybean, Soybeans, Lactose, Magnesium in the body, Magnesium (Nutrient)

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Interaction of calcium and phosphate decreases ileal magnesium solubility and apparent magnesium absorption in rats

Article Abstract:

The cause of the decreased intestinal absorption of magnesium in rats in the presence of high levels of calcium and phosphate was investigated. Results showed that high calcium concentration did not cause reduction in magnesium absorption in the absence of phosphate. It was concluded that the reduction of magnesium absorption is caused by the formation of a calcium-phosphate-magnesium complex which reduces the bioavailability of magnesium. It was also suggested that the magnesium to phosphate ratio determined the formation of the complex.

Phosphates, Calcium, Calcium (Chemical element), Magnesium, Magnesium (Metal)

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Excessive cholesterolemic response in analbuminemic rats fed a cholesterol-rich diet conaining casein

Article Abstract:

The hypercholesterolemic effect of casein on Nagase analbuminemic rats and Sprague-Dawley rats was investigated. The test animals were fed with purified cholesterol-free diets supplemented with either casein or soybean protein. Results showed that Nagase analbuminemic rats were more prone to hypercholesteronemia. The lack of inhibition in cholesterol synthesis might have led to this condition in analbuminemic rats.

Hypercholesterolemia

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