Energy is fungible. Eating less can result in the same caloric deficit as exercise over a "normal" diet. Since fasting itself has some health benefits, it's pr

Energy is fungible. Eating less can result in the same caloric deficit as exercise over a "normal" diet. Since fasting itself has some health benefits, it's probably better to do any exercise at all while reducing food intake, than it is to eat "normally" and try to make up for it with exercise which is not likely to confer much more marginal health benefit.