This is completely unsubstantiated. Worse yet, the "from an evolutionary standpoint" trope is frequently (ab)used to support some kind of pseudoscientific idea/diet (Paleo springs to mind here). If you have a real, coherent argument based on verifiable truth to make that is great, but right now you're just making something up and running with it because it feels right to you. Nobody benefits in this scenario, least of all you.