Abstract
Weanling Sherman rats were pair-fed for 8 days on a control or a magnesium deficient diet containing 70.5% sucrose. After a 12-hour fast, the rats were injected intraperitoneally with glucose (250 mg/100 g body weight) and arterial blood was drawn at 0, 15, 30, 60, 90 minutes after injection. Before glucose loading, in magnesium deficient rats, plasma magnesium levels were significantly increased. The plasma triglyceride concentration was significantly higher in magnesium deficient rats compared to controls. After glucose loading, in the control group, the plasma insulin concentrations increased to 67.9 +/- 5.8 microU/ml at 15 minutes and returned to pretreatment levels by 30 minutes; in the magnesium-deficient rats, the plasma insulin levels were significantly lower at 15 minutes 32.9 +/- 5.6 microU/ml (P less than 0.01) and returned more slowly to the pre-challenge level. No significant differences were observed in plasma glucose levels between the two groups of rats.
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