If you've been obese, or even overweight, at any time in your adult life, that can be a matter of life and death.

A new study finds with extra weight, your risk goes up of dying from cardiovascular disease, cancer, respiratory disease, and all other causes.

Researchers from The Boston University and Harvard Schools of Public Health, looked at the weight and health of 225,000 people over 16 years. The doctors say given that about one-third of adults in the U.S. are overweight, this is more reason why people should follow a healthful lifestyle and try to keep a normal weight.