Why there are some people never put on weight,even they eat a lot?

Yeah! there is a people like that it could not affect their weight even they eat a lot. Actually, I am so thin before even I eat a lot it cannot affect my body. How I wish before to make my body bigger. And I tried to eat and eat more until it works. And now, I am bigger than before but not an overweight. my weight is balance to my height and I maintain my body now. Maybe, if you are a small person, it is hard to gain weight even you eat a lot but, if you are big person it is hard to lose weight. Like my sister, She is not comfortable to her body because she doesn't know how to lose their weight even she only eat a little but it doesn't affect to her weight. It is better to have a daily exercise to maintain your body shape.

hi there personally i feel it is all because of their high metabolism rate that they have. Which means that they actually burn out their calories really fast compared to other people. Well this is what i think it is. I know of friends who constantly eat so much just to put on weight, but unfortunately he never does. Its really amazing to see people see really alot but dont put on weight. I think they are the special ones or at least in my opinion. Well to sum this up i think it all boils down to the individual metabolism rate. Well you might want to read more about this online. A good weay to start woulf definitely be the wikipedia. Anyway have a great day ahead and happy mylotting. best regards, alvingb

Well, I am one of those person. It is a disorder were the body burns energy faster than usual. And i am also always on the go. My doctor says it is just fine and I just have to wait til my metabolism slows done as I grow older.

I don't know the truth so what I am saying is just plain guess. How much food you eat has nothing to do with how much your body will take in. It all depends on how much your stomach is able to break down and small intestines able to absorb. So, it may be possible that those people simply don't absorb or in other words, they just waste the nutrients in the food. :) Another possibility may be metabolic rate. The rate is simply different from people to people where some people have higher rate so that they will burn more energy than others even they are just doing normal day to day activities.