Hi. I think it is wrong for your brother to do that, but you have to understand that brothers and sister normally act like that. I know it isn't right, but all siblings tease eachother, and if someone says they never do they are lying. All you can do is try not to listen to it. If they are eating foods you like just get out of the room. If you aren't there to see them eating it, maybe you won't be so tempted. Also, exercising is a proven way to get out anger and frustration. So, when they are bothering you just go for a walk or do some other exercise. I have a sister and she has had a weight problem all her life. When I was younger I use to say things about it. Even though I am overweight she is much bigger then me. As I grew older I realized how much it must bother her and it stopped. It is a part of growing up and when your brother gets a little older he will understand. As for now all you can do is ignore him.