My diet is roughly 50/50 on fat & protien. 200-300g of each a day. I have seen people talk about higher fat having benefits, & I have seen some people who seem to prefer higher protein. I suspect some of that may have to do with what damage was done by prior eating practices & what is needed for recovery. And the requirements of certain lifestyles & living conditions.
There are plenty of records showing that people will eat any gabarge when there isn't enough food. I suspect plants & clay & the other things people have consumed are primarily just poverty foods. Something in your belly is better than nothing. The south in the US was historically poorer, but always cooked veggies in animal fat to make them healthier. That of course was inverted when animal based frying oils were swapped with what is basically plant based poisons. But maybe there is more to it than that. 🤷‍♂