Why Thin and Trim Might Not Equal Healthy. Get the skinny on what habits need to be part of the equation: A lot of us may buy into it- the idea that being slender equals being healthy and in good shape. But that might be a risky assumption. There is more to it than that. For example, it's essential to eat right and get regular exercise- no matter your body weight. In fact, research shows that inactive people at normal weights may have higher rates of disease and early death than those who are obese and active. This doesn't mean weight isn't important. But think big picture- with physical activity and smart eating in your sights too.