Stable isotopes are safe, versatile, scientifically rigorous tools for
studying nutrient metabolism in humans, They can be used to follow th
e metabolism of nutrient minerals from specific foods or diets, includ
ing the determination of efficiency of absorption and the effects of d
ietary constituents on absorption, and to investigate fundamental aspe
cts of nutritional biochemistry. In this article we describe stable is
otope methods and the results of some recent nutrient mineral metaboli
sm studies in humans.