Your waistline is a window to your heart's health. Waist size is a better predictor of heart disease than total body fat, new research shows.

It probably won't shock you to learn that larger waists mean greater heart disease risk. It's no secret that being out of shape is a major risk factor for heart disease.

Now, scientists have pinpointed the exact numbers to watch out for.

Using a tape measure is easier than calculating your body mass index (BMI), and it's also better at assessing heart disease risk, say the researchers in February's American Journal of Clinical Nutrition.

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