Researchers at the University of California, Irvine, have been looking into the link between the body's biological clock and aging.  What they found is that our body's natural circadian rhythm slowly derails metabolism over time.  Basically speaking that means just getting older makes us fatter!

So how to slow down a natural process?  They say the best way to combat this effect is to eat a low-calorie diet.

Cue the white lab coats and mice! When the scientists looked at mice, they found the group that was fed a diet with 30 percent fewer calories for six months processed energy in a more stable way.  Like the tortoise, with metabolism and aging -slow and steady wins the race.

At least that's what scientist believe. The implications for humans could be significant, but more research would need to be done to prove it.