Eat Less!

I know you don't want to hear that, but it's worth a try. Many studies on animals have shown that eating slightly less than your body needs to maintain its weight ends up extending your life span (although there is still controversy over this diet works on humans or not).

Eating less reduces the risk of many of the most common diseases and complaints people have in old age, including extra weight, high blood pressure, high cholesterol, and heart disease.

At the same time, a restricted-calorie diet should be used with caution, as there are possible negative consequences, including: loss of muscle mass, less bone density, anemia, dizzyness, and depression.

Here is some more information from the Mayo Clinic on restricted-calorie diets:

http://www.mayoclinic.com/health/anti-aging/HQ00233