Someone once asked...
Someone answered with kindness...
First, think about why you feel that way. If it's because of friends, you might want to find some better friends. If you are worried about your health, talk to a doctor. You don't have to go on a full-blown diet, but you could cut back on snacks (if you eat anything between meals), or try to incorporate more healthy options into your food. The most important thing is that you feel good about yourself.