I love your curious mind, Mitch! A your sense of humor (gaining weight to save the planet, lol)! There is so much info about diet, it's hard to keep up. I follow Dr. Michael Greger (nutrition facts.org) Here is a video that I think you may enjoy. He is a bit of a showman, as his audience loves to interact with him as he uses some key phrases that are sort of his trademark; but he has excellent credentials, and if you watch just the first 10 minutes, he explains some key things. Like me, he acknowledges the influence of corporate money in medical research. https://nutritionfacts.org/video/evidence-based-weight-loss-live-presentation/