In my opinion a proper diet not only prolongs our life but also helps us enjoy good health. When we are obese, our average life expectancy reduced of nine year and we are more likely to get cancer, heart diseases and diabets. That's why more and more people decide to go on diet. People, especially young girls, think that must lost their weight. Going on a diet is good when we do this for health, but when someone is slim it is very dangerous. It causes many other diseases. I think that are benefits and many risks going to a diet. People are feeling healthier and more happy when they have lost weight. Overweight has risk to have high blood pressure. They are often diabetics, so diet is very important for them. People who eat healthy food can be strong because vegetables have vitamins which human's body needs. Good diet...