Exercise vs. diets: weighing the benefit

"There's even more evidence that it is never too late to start exercising. When overweight older people start walking or riding a stationary bike, they are able to improve their exercise efficiency, according to a new study. Exercise efficiency refers to using fewer calories to perform a physical activity. Also, exercisers burn more fat and lose less muscle than older people who simply diet for weight loss. People tend to lose lean muscle mass as they age, and if they lose too much, it can interfere with the activities of daily living. The study is published in the Journal of Applied Physiology" - WebMD