Some people have light skin, some have dark skin, some have brown hair, some have blonde hair, some are tall and skinny, some are short and fat. All over the world kids have different ways of doing things. They have different hobbies, play different games, celebrate different holidays. I bet even your friends do things differently than you do. Some sleep more, some play more, some are great at math and some are best at sports.
Some people are fat, some are skinny.
We all need some fat on our body to give it shape and to keep us warm. We all need different amounts of fat depending on what we like to do. Fat is like fuel. The more energy we use, the more we need. Athletes and dancers need more than artists and writers who do not move around as much.