What happens if I do exercise without dieting? But is exercising — without adhering to a healthy diet — an effective strategy for weight loss? The short answer: No. As good as exercise is for you, it won’t help much without dietary modifications if you’re trying to lose weight and fend off heart disease, diabetes and other ailments, dietitians and researchers say.
Why is exercising better than dieting? “It looks like exercise makes fat more fit,” Dr. Gaesser said. The primary takeaway of the new review, he concluded, is that you do not need to lose weight to be healthy. “You will be better off, in terms of mortality risk, by increasing your physical activity and fitness than by intentionally losing weight,” he said.