Not eating can mess with your body’s ability to control your appetite. But it also destroys willpower, which is just as damaging. “Regulating yourself is a brain activity, and your brain runs on glucose,” says Martin Ginis. If you skip breakfast or a healthy snack, your brain doesn’t have the energy to say no to the inevitable chowfest.

So skipping a feed helps turn us into gluttons at night. Your starving brain “just doesn’t have the fuel it needs to keep you on track, monitoring your diet.”

Break it: This one’s easy. Spread your calories out into three meals of about 500 calories each, and two snacks of 100 to 200 calories each, says Liz Applegate, Ph.D., director of sports nutrition at the University of California at Davis. Most men who are trying to lose weight still need at least 1,800 to 2,200 calories a day, says Applegate. More important, change your mindset, she says. Think I’m going to start a new routine, not I’m going to restrict myself. Restriction leads to overeating.