Answer 1 out of 12
 
A:

Maybe you are just more active than your friends! Are you really active, hardly ever siting down etc etc? I think genetics probably have something to do with it as it can work the other way round i.e, some people don't really eat very much and can be quite fat. Could be something to do with an over or under active tyroid gland.

Maybe you have a tape worm!

 
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