eli5: If I consume a pound of olive oil containing 4010 calories, and a pound of fat is 3500 calories, how would I gain more than a pound of fat despite only consuming a pound?

Question

Water? Idk

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Answer 1

So the reason is because of different energy content of different fats.

We say “fat” is 3500 calories per pound, but that’s just rounding. [Fat can be different things like linoleic acid, or oleic acid](https://en.m.wikipedia.org/wiki/Fatty_acid). They are different, with different amount amounts of chemical bonds and different ratios of hydrogen and carbon. That means they need different amounts of oxygen to react and create different amounts of energy.