EXERCISE IS NOT A MAGIC BULLET FOR WEIGHT LOSS It's the classic weight loss formula: burn more calories than you eat, and the pounds will melt away. But anyone who's ever sweated through a bootcamp class and then found the scale barely budged knows it's not quite that simple. Research is clear: while exercise alone doesn't lead to dramatic weight loss for most people, it plays a surprisingly big role in keeping lost weight off ( Jakicic et al., 2019 ; Swift et al., 2018 ). Why doesn't exercise melt fat away like we'd expect? Part of the answer is that working out can make us hungrier. After a tough session, people often eat more—sometimes without even realizing it. On top of that, our bodies adapt to increased activity by burning fewer calories during the rest of the day, a phenomenon known as "metabolic adaptation" ( Rosenbaum & Leibel, 2010 ). Our ancestors' bodies evolved to conserve energy during hard times, and that survival trick now ma...