Breakfast can give you a much-needed energy boost to start your day. But when it comes to shedding pounds, it may be smarter to push your morning meal to after your workout, according to a new study in The Journal of Physiology. During the six-week study, participants who ate a high-cal, high-fat breakfast before hitting the gym packed on an average of three pounds. The after-workout eaters? They gained almost no weight—although they ate the same breakfast. Exercise elevates levels of the fat-burning hormone adrenalin, says lead researcher Karen Van Proeyen, Ph.D. But when you work out after eating, the insulin your body releases to help you digest the food blunts the spike in adrenalin. Result: You burn less fat. Can’t push through with a growling belly? "Try splitting your breakfast," suggests Leslie Bonci, R.D., director of sports nutrition at the University of Pittsburgh. "Have a 4-ounce yogurt before your workout and have whole-grain toast with peanut butter and a banana afterward."