Our biology makes it hard to lose weight. In this episode, we won't tell you how to lose weight — or whether you even need to. We will give you five realities about biology, and they might even help you be kinder to your body. Here's what to remember: - Metabolism slows when you lose weight. - Hormonal changes that come with weight loss make you hungrier. - What you eat is more important than how much you exercise. - Exercise seems to play a big role in maintaining weight and preventing further gain.