Why is it so hard to believe that some people are just built small? Everyone used to tell me you will gain weight when you have kids, when you turn 30, when you turn 40, etc., and it never happened to me. Maybe it will happen someday but not every body is built the same. Do I have the same figure I had as when I was 25? No, but I still do not gain weight very easily. On the other hand, I don't think people think I am overly thin but I am definitely built smaller and weigh less than other women I know in my age group. And it is not because I do not eat or am an exercise fanatic.