Dieting Will Help You br Lose Weight More Than Exercise According to the National Institute of Diabetes br and Digestive and Kidney Diseases, up to 15 of an average person's daily calories br are burnt through exercise. This isn't even close to food consumption, br which takes up to 100 of a body's energy. Nutritionist Lisa Drayer, via 'CNN' A study from Harvard Medical School adds that the benefits of exercise are very easily undone br by eating the wrong foods. Eating a few chocolate chip cookies can cancel out 200 calories burned from walking 30 minutes at a brisk pace. So if you want to lose some weight, br its more effective to improve your diet.