Abstract
The effects of dietary cholesterol on the levels of serum calcium (Ca) and magnesium (Mg) and the ratio of Ca/Mg in female rats were determined and compared with the serum levels of cholesterol (Chol) and tocopherol (Toc). Dietary Chol (0–1%) had a significant effect on serum Ca and Ca/Mg ratio (r=0.64, p<0.01 and r=0.54, p<0.05, respectively), but not on the level of serum Mg. Serum Chol was significantly and positively related to the levels of serum Ca (r=0.66, p<0.01) and Ca/Mg ratio (r=0.59, p<0.01). An increase in serum Ca levels correlated positively with the ratio of serum Ca/Mg and Toc (r=0.83, p<0.001 and r=0.64, p<0.01, respectively) and negatively with Ca/Chol (r=−0.61, p<0.01). The relative nutritional status of Toc to Chol, Toc/Chol, showed an inverse relation to Ca and the Ca/Mg ratio in serum (r=−0.64 and r=−0.60, p<0.01, respectively), but a direct relationship to the Ca/Chol ratio (r=0.91, p<0.001). These results indicate that when Chol levels were high in the diet and in serum, the levels of Ca and the ratio of Ca/Mg in serum were also high. A high Toc/Chol ratio would decrease the levels of Ca and the Ca/Mg ratio. Our findings suggest that the ratios of Ca/Mg and Ca/Chol in serum would be useful as indicators of the risk of coronary heart disease.
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