Anonymous wrote:Geneticist here.
Yes, metabolism is partly inherited, which means that weight is too. You can take after your father or your mother.
"Partly" being the key word here. With appropriate nutrition, people can slim down. Developing good eating habits as a child is WAY MORE important than exercise, especially as modern Americans understand exercise (structured, in a gym, or at an extra-curricular activity). This is because Life comes in the way of that type of exercise, but train good eating habits, and you keep them for ever.
Natural exercise should be encouraged as much as possible - walking rather than driving, hiking trails on weekends, etc. But for many people this is impossible: They don't live in walkable areas and aren't comfortable spending their time outdoors in an unstructured way. This is unfortunate, because walking is really the best exercise, since it's something one can do every day, all one's life. There is research done currently on how strenuous exercise isn't as great as one thought for one's health (running, for example), and that gentle but daily exercise is better.
A rule of thumb: if you rely on intense exercise to maintain a healthy weight, it means you're eating too much. You will gain as soon as Life happens and you can't exercise, because changing eating habits takes effort.
+1 This seems spot-on!