Leptin is a type of hormone called an adipokine that is released exclusively from fat cells. Leptin interacts with your brain to get your body to eat less and burn more calories. The more body fat you have, the more leptin your fat cells will release. However, too much body fat leads to too much leptin being released—a condition called leptin resistance. When this occurs, your brain becomes numb to leptin’s signal. To maximise leptin sensitivity, get adequate sleep and pack your diet full of antioxidant-rich berries and green and red vegetables. Losing weight also enhances leptin sensitivity and gives you some momentum, as the more weight you lose, the more effective leptin will become in your body.