Seems the healthy fats from olive oil keeps bellies flat, which is a mighty good thing. You know why? Because excessive amounts of abdominal fat increases your risk for high blood sugar and other health problems. Now olive oil alone won't do the trick -- you've got to eat an overall healthy diet and exercise too. But getting a good amount of your calories from unsaturated fats, like those found in olive oil, can surely help prevent tummy troubles over time. They will also help you maintain better insulin sensitivity.

The Mediterranean diet is one you might want to adopt. About 30 to 40% of calories in this diet come from unsaturated fats. A diet you'll want to avoid: The high-carb diet. It tends to cause body fat to relocate to the belly.