It is not as easy to tell which is best dieting or exercising. But it is the net calorie deficit – burning more calories than you consume that counts the most.
Researchers divided three-dozen overweight but healthy men and women into three groups. First group decrease their calorie intake by 25 percent while the second group increase their calories consumption by 12.5 percent while burning 12.5 percent more calories by exercising. And the third group makes no change to its dieting or exercising pattern.
The researchers noticed the weight loss, body composition and measures of superficial and deep fat. But they found that it does not matter whether you lose weight by exercising or by dieting or combination of both dieting and exercising. But exercising has its own health benefits (From The Boston Globe).