Paging Dr. Oz

Dr. Oz introduced us to a part of the body many people had never heard of—the omentum. You know that a poor diet can cause your omentum to get larger, but once it's large, can you shrink it? "Absolutely. That's the whole purpose of the omentum," Dr. Oz says. "We're born with omentums that we can store fat in. So we're supposed to be able to have it get bigger and smaller."

You also know that your target omentum measurement is 32 and a half inches for women and 35 inches for men. If you have trouble remembering that target, Dr. Oz has a shortcut—your waist shouldn't be any larger than half of your height.

But what is the best way to measure your omentum?

Dr. Oz says to first find your belly button. Then, before you measure, suck your stomach in as much as you can. "We're not concerned about how lax your muscles are or your posture. What we want to figure out is what's going on inside the muscles, where the omentum is. You can't suck your omentum in," he says. "If you're sucking as hard as you can and taking a deep breath in, if that lets you measure your waist to just get the omentum, you're doing fine