Eat at least 1,000 calories each day.
Your body and metabolism thrive on food. When you fast, crash diet, or restrict your intake to 1,000 calories or below, your metabolism will respond by slowing down to conserve energy. Imagine your metabolism as a blazing fire — feed the fire consistently with wood and it continues to burn at a good rate, but if you run out of wood the fire goes out. Even when you're cutting calories to lose weight, it's important to feed your fire and keep your metabolism at its optimal level by eating at least 1000 calories a day.