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"The BMI numbers are way too general to be really useful," says Tammy Callahan, marketing manager of Life Measurement Inc., which manufactures a fat analyzer for use in ti gymnasiums and medical settings. "These numbers were developed using data ti from enormous numbers of people. They don't tell you anything about your own body composition, how much of your weight is fat, and how much is muscles and tissue." But don't throw out that BMI chart just yet. Are You At ti Risk? "I'm not against people using devices to figure out fat percentages, but it is a well established fact that your BMI number does tell you a lot about your risk of diseases, especially heart disease and diabetes," says Harry DuVal, PhD, associate professor of exercise science at the University of Georgia in Athens. "Fat percentages just don't have enough research behind them yet to tell you how much risk of disease you face." You're probably familiar with body mass index. BMI is an equation that gives you a numerical rating of your health based on height and weight.
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