For example as much as I eat I can barely increase my weight, while other people I know have to be super careful with what they eat to not gain too much
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Metabolism, and food type.
Long story short, ALL food comes down to calories (energy)
If you expend more energy than is needed, you lose weight.
If you gain more energy than is needed, you pack on fat.
Metabolism determines how much energy is needed and how fast.
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