The world is getting rounder, one person at a time.

I'm Dr. Caroline Cederquist, giving you the Skinny on Your Health.

Researchers looking at global data find that more people are getting bigger around the midsection over the last couple decades, with the sharpest increase over the last five years.

Now, we're not just talking about people being overweight, though that is certainly part of the problem. This trend shows up even among normal-weight people

And this is not your father's pot belly paunch. Data show that the greatest increase in average waist circumference is among people aged 20 to 29!

Why does it matter? Waist Circumference is very closely correlated with several major health risks, including heart disease and diabetes. People who tend toward an apple-shaped body suffer more frequently from these illnesses than folks whose bodyfat tends to be around their hips and thighs.

Healthy men should have a waist no bigger than 40 inches across the belly button. And for women, no more than 35. If it is more, you may have bigger worries than just your weight.

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Caroline J. Cederquist, M.D. is a board certified Family Physician and a board certified Bariatric Physicians (the medical specialty of weight management). Dr. Cederquist is the founder of Bistro M.D., a home diet delivery program that specializes in low calorie gourmet food that is delivered to your home or office. Bistro M.D. serves as culmination of Dr. Cederquist's expertise and experience in the world of medical weight loss.