Yes, but just because they are slim, does not mean they are fit. It is important what you put into your body. I read you should have at least 10 servings of fruit and vegetables a day to stay healthy. Also, it is important to eat a lot of fish. We need to start thinking about when we get older. My grandmother has osteoporosis, a really humped back, and her doctor said it was because she didn't get enough calcium when she was young