You are the one who used the term requirement. I'm merely playing the game you set up here. That's why I'm confused.
99% of people eat stuff that doesn't occur naturally unless they are full paleo.
If you wanted to be the healthiest version of yourself you should never eat a burger, so I don't get what the consternation is here.
Sorry...first time I've jumped back on the forum.
You are correct, I did introduce "requirement" so that is my bad.
I will challenge you to cite one scientific study to support your last statement. I can save you time, there is none...yet. Every study done to date tries to draw conclusions of eating red meat while the subjects are also consuming other foods. There is no controlled studies verifying the effects of just eating red meat.