[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/08/07/art.treadmill.gi.jpg caption="Whether because exercise makes us hungry or because we want to reward ourselves, many people eat more — and eat more junk food, like doughnuts — after going to the gym."] By John Cloud TIME As I write this, tomorrow is Tuesday, which is a cardio day. I'll spend five minutes warming … Continue reading TIME: 'Why exercise won't make you thin'