[harpersealtako]

The problem with the evidence and research around the "plant based diet" is that there is an ulterior motive for most of the research (legitimate ethical concerns around meat eating) which taints a lot of the data.

For example, Dan Buettner (the author of Blue Zones) suggests that Okinawans eat a 98% plant based diet which is...I won't say "fraudulent" because I think it's possible it's an honest mistake but it's definitely not "correct" at all. It's based off of some sketchy anecdotal accounts of WWII starvation diets where the only ate potatoes. Western centenarian researchers and health gurus repeated that factoid a bunch and it became "the okinawan diet is basically a potato-heavy vegan diet" in some twisted game of telephone.

In actuality both modern and ancient Okinawans have the highest meat consumption in Japan. Lard is the go-to frying oil even for vegetable dishes. The largest proportion of calories come from animal products. The Okinawan diet is a high fat, high carb, moderately high meat diet whose main "secret" is conscious portion restriction (the local "eat until you are 80% full" mantra). They do eat plenty of fish too, just not as much as the mainlanders (the idea that the okinawan diet is low in fish is crazy because the okinawans have a super unique and proud local history of fishing and seafood foraging traditions).