The most important health number

Here's an important health number to remember : it's 5.

That's the minimum number of years you should maintain a steady, healthy weight- no yo-yo dieting! Experts say the more consistent your body weight is, the stronger your immune system. That's because weight fluctuations impair the body's ability to produce infection-fighting cells. Get down to a healthy weight, and try to maintain in for as long as possible.