why is it that skinny people who eat a lot & doing nothing stay skinny, but for

the others..? most skinny people/ people who aren't fat or super skinny eat like big cows & don't have to do anything like sports or workout, they just sit on the couch or on the computer all day but they still maintain being skinny? but on the other hand the other people who want to eat like pigs must workout in order to keep there body in shape? sorry this is how i can explain, sorry if you do not understand what i mean.
 
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