Nutrition can be complicated. How do you know what foods are healthy and what aren't? How much should you eat? How do you tell if you're overweight? Being overweight or obese is a big problem these days. All around the world, lots and lots of people, both adults and young people, weigh more than is healthy. Find out what it means to be obese or overweight. Discover what to eat to lose weight, and how to stay healthy.