In order to lose weight, most people need to maintain a calorie deficit over a sustained period, says Bethan Crouse, a performance nutritionist at Loughborough University. “This can be done by increasing exercise to boost your calorie expenditure and therefore create a deficit,” she says. “In that case, exercise might be the key to losing weight. But you could approach it the other way: by choosing less calorie-dense foods and reducing your energy intake, you can create a deficit without changing how much you exercise.”
Relying on workouts alone for weight loss can be challenging. “If you’re aiming to burn an extra 300 to 500 calories a day, that’s an awful lot of exercise. You’re likely to need some kind of nutritional intervention as well to create that gap between energy intake and output.”
