plants (mostly) make carbohydrates and you can eat them to get energy. But some things are carbohydrates but you can’t really digest them. Like wood. So if You ate a block of wood they would write it like “1000 calories, but not any you can use so -1000 as fiber”.
its not like eating fiber is magic food that removes calories you ate some other time, it’s just things that theoretically could have been calories but not for humans.
it’s like if there was a drink made with Motor oil and milk it would list itself as a million calories but only the milk ones do anything so -999,900
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