Eli5:What prevents our bodies to get rid of excess food/calories that are not necessary, and instead turns it into fat?

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Eli5:What prevents our bodies to get rid of excess food/calories that are not necessary, and instead turns it into fat?

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Through most of human history and that of our evolutionary ancestry, storing energy was beneficial to survival since food was more difficult to come by. As a result, we evolved to store excess calories for future energy. But now we live in a society of abundance where it is not as useful.

Your body has no way of knowing that it is excess calories that are not needed. We evolved in a state where starvation was an almost constant threat. As such it stores excess calories as fat for use when food is not available.

Evolution. At some point in our history our species had times when food was sparse. Those that could efficiently store calories as fat lived and those that couldn’t, starved. It’s pretty recent that many of us lived in a situation without food scarcity.

Why would our bodies waste such useful resources???

Fat is what keeps us alive when we have no access to food. It’s a built-in survival storage system for many, if not all, animals. Including humans. We view fat as bad, but it’s not. Too much of it is bad. But then too much of anything is bad. That’s why it’s “too much”.