Question: When someone loses weight, where does the weight go?

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  1. The weight that is lost is a combination of water and fat. When someone gains weight it is because they are consuming energy that they then are not using. The body does not like to waste energy so it stores it in fat. The more energy you consume without burning the fatter you get. If you can turn the tables and start using more energy than you are taking in then the body has to fall back onto those reserves of energy to keep things working. The fat is mixed with water in the body so when people start losing weight it is a combination of both.


  2. Trolololo,

    Short version, E=mc^2. We convert mass into energy when we are using more energy than we are taking in.


  3. I’m sitting here reading about this and trying to find out. The human body and the metabolic system sure is complicated. I’m try to get to a slightly deeper answer than the weight (let’s just say fat) gets converted into energy. This is true, but what form of energy and how is it used? And ultimately where does that energy go? My conclusion is that ultimately much of that energy is dissipated as heat. The fat plus oxygen (breathing in) produces carbon dioxide (breathing out) plus water plus energy. I think most of the energy produced from burning fat goes into maintaining your body temperature. The energy used to drive muscles must come from another metabolic path primarily.