Eli5 why do we CONSTANTLY need oxygen?

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Surely we can switch off for a little while like a half hour and be fine why does everything just immediately fail if we don’t get oxygen? It’s such a design flaw. What is it actually doing to me that is so necessary I need it constantly?

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Your body’s energy to live comes from oxidizing carbon. That’s why you eat carbon rich foods (carbs and fats) and breath in oxygen and breathe out carbon dioxide. It’s not too different from to very slow, controlled burning of the food. Just like a fire without oxygen the fire stops, without oxygen all the processes that represent your life stop, too.

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