Sorry this is my second comment on day one, but I have just read a comment about “man’s original diet”, which quotes a nutritionist as saying “ That a certain diet was closer to what we were designed for”. initially I would say science does not support the idea of divine design for our species. So I would prefer to stick with term evolved in my comments.
If we choose to go far enough back we originally evolved to photosynthesise sunlight. Fast forward several billion years past the primeval slime buffet and look at the evolution of the Simian's, they were by nature opportunistic feeders, taking what food they could get when they could get it. Preference based on availability and this is, at least to my mind, the basis of what we evolved to.
Diets based on beans, lentils etc would have only been available in areas where wild variants of these items would grow. Home erectus and Neanderthal were never great believers in 5 a day, more focused on getting any food in 5 days.
Even after the agrarian revolution local diet was surely still based on local availability. It was certainly much later in man’s evolutionary path that a mixed options diet became widely available and only when foodstuffs could be transported effectively. So whilst we rightly praise the “Mediterranean diet” we should note that the rest of the world who could not access such a diet certainly did not die out. So I think it would be fairer to say that human kind evolved to eat what was available. Only with greater choice, science and shared knowledge did we start to greater idea of what an ideal diet would look like. So let’s just eat a balanced diet based on what we need now and stop this apparently constant need to somehow justify it.