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.
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.
