Or, perhaps it was both? The combo would be something that is unique to the species, yes? Fire (via meats) supplied certain nutritional advantages. Fermentation

Or, perhaps it was both? The combo would be something that is unique to the species, yes? Fire (via meats) supplied certain nutritional advantages. Fermentation increased guts bacteria, which we are finding has broader impact on the system that is the human body. Is don't understand the obcession with making everything binary, and then from there having to have a single winner take all assumption.