The next number Dr. Oz says everyone needs to know is one you can measure at home—waist size. "Waist size tells you about the belly fat, and it's that belly fat that puts pressure on your kidneys, and your kidneys regulate your blood pressure," he says. "So by squeezing your kidneys, you're actually forcing your blood pressure up."

Dr. Oz says your waist size should be half your height. "For an average size female, that's less than 35 inches; less than 40 inches for a male. Those numbers are obesity thresholds," he says. "Ideally, I'd like you less than 32 and a half inches if you're a woman and less than 35 inches if you're a male."

Dr. Oz says you can measure once a week or once a month. "You can take your choice. I favor once a month because it doesn't change that much from day to day," he says. "But when you're getting in good shape and you're building up muscle, your weight won't drop that much, but your waist size will."


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