Jkei t1_j2de3c9 wrote
Reply to comment by marcuschookt in ELI5: If I were to eat a thousand Snickers bars, I would put on significantly more weight than if I were to eat a thousand heads of cabbage despite the huge disparity in weight of the pre-consumed food. Where does this mass come from? by marcuschookt
You're asking why some things contain more energy (that you can extract) than others?
Time to look up the Krebs cycle and oxidative phosphorylation. I'm sure they've been explained in detail on this sub before, and good old wikipedia will probably do a decent job of it too.
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