Cross-Cultural Leptin Collection

 A couple of months ago I tangled with Dr. Rosedale, a prominent low-carb advocate who was talking about how his diet is better than the Kitavan diet at improving markers of longevity, like lowering leptin levels. It's kind of hard to refute that since there is no study utilizing the Kitavan diet in non-Kitavans and seeing how it improves leptin levels that I know of, but it made me curious to see some cross-cultural data on Leptin. I collected an assortment of things, just for fun (let me know in the comments if you have any interesting data I should add):