Eat before a workout! You won’t burn more fat if you exercise on an empty stomach. Exercising on an empty stomach does not affect how you lose weight. In fact, it may hinder it if you don’t have the energy to exercise. Jillian Michaels says that your body needs some glucose (blood sugar) for fuel in addition to what it can use from fat stores when you’re working out. If you don’t have any blood sugar available, your body will eat the muscles’ glycogen, or stored glucose. Low blood sugar will also make you tired and sluggish during your training session. For these reasons, you should at least have a banana before you start to exercise. The best time to eat is between 45 minutes to an hour before training, this way you’ll have more energy and endurance to work harder, burn more calories, and improve your muscle tone.