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>Why would fruits be more scarce for a non predator (as where human ancestors), than meat?

Because there exist more competitors for the fruits. There are more plants than there are herbivores than there are carnivores.

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On the contrary, there are orders of magnitude less megafauna than plankton. And there’s a diminishing range in between. It’s easier to get berries for dinner, than boar. Of course, things could be the opposite during Ice Ages, but that’s just a glimpse in geological time, not convinced that metabolism would change entirely during that period.

Guess you didn't understand my last sentence because it's not contrary to what you written.

There are more boar eating the berries than there are of you.

A trip to the woods would with a high likelihood show that there are more berries around than berry eating boars. But my point is not that there is no competition for resources, and not that there always was an abundance of everything, but that the carb scarceness theory is not a complete explanation. Because food in general was scarce, and we either should have the same cravings for other nutrients or the „carb-stuffing“ notion is a bit overused.

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