[tosser0001]

Anything that requires hard chewing like nuts, raw vegetables and tough meats.

The first I ever heard of this topic was from reading the book "The Evolution of the Human Head" (2011) by Daniel E. Lieberman. It's an academic book, and parts are not exactly light reading targeted for the general public. I had read it when it first came out, seemingly well before it because such of point of discussion.

The problem with this topic is, if you try to look anything up on line you can quickly find yourself in the "manosphere" with its associated toxicity.