Your body needs fuel to exercise, and the source of that fuel is food. That's why some people report feeling hungrier when they start to work out. If you're trying to lose weight, this could be counterproductive—unless you find the right balance of healthy, filling foods. (Snack AND lose weight with this box of Prevention-approved treats from Bestowed.)
The typical American diet is loaded with refined or simple carbohydrates such as white flours, rice, and pasta, and pastries, soda, and other sugary foods and drinks. These carbs, which lack the fiber found in complex carbs (whole grains, fruits, and veggies), are metabolized by your body quickly. So while you may feel raring to go after eating them, that energy boost will soon be followed by a major energy slump, making it hard to give your all during your workouts.
In addition, if many of the foods you eat are metabolized quickly, you'll find yourself feeling hungry more often, which could mean more snacking and a higher calorie intake. To keep from eating back all the calories you've burned, stick to a diet based on these 6 science-backed components.