It Takes Guts

Eat less, move more. That’s been the mantra of the weight loss movement for decades. But as those who have fought the battle of the bulge will tell you, there’s a lot more to obesity than just too much junk food or too little willpower. Even when genes are taken into account, scientists have struggled to explain why one person can eat cake and stay skinny, while another munches on carrots and can’t shed a pound.