this is conflict with the studies done about "Blue Zone Diets", showing communities with highest number of centenarians don't eat much meat, typically have strong community/religious connections, don't eat processed foods, get sunshine and activity on a regular basis. [0]

I don't put a lot of faith in the whole Blue Zone diet thing, because like the Ancel Keys's complete bullshit "Seven Countries Study" [0a] which left out nations/data-collected that would have totally made the study come to different conclusion [0b], the Blue Zone diets leave out some inconvenient facts. For example, Spain and Hong Kong are among the regions with the longest lifespans, lots of pork, fish, chicken, and beef in their diet. I feel the whole Blue Zone thing has been debunked from a 100 directions but I still keep coming back to it because tons of other studies tend to back up the general ideas of mostly plants(and a wide variety of them), meat some-times, communal bonds and religious belonging (i struggle with this one). For example:

Studies showing vegetarians are least likely to get cancer [1]

I've also seen studies linking low protein for anyone under 65 and a bit higher for over 65 being credited for longevity [2] The reasoning here is low protein is good for life span, but at a certain point maintaining muscle mass becomes vital to prevent falls in old age.

I've done a ton of health and longevity reading in the past 3 years. Obsessively so. And the conclusions I've come to is that studies tend to trend in a couple directions.

Higher protein (when talking about full amino acid profiles brought by meat and animal products) seems to be geared towards more short-term health-span - you get greater mental performance, better muscle growth, higher reproductive functionality.

Lower protein can come with risks of certain vitamin deficiencies (hence why most blue zone diets aren't totally vegetarian) but overall spur on longevity. And it does this, from my understanding because you're not activating mTor [3] [4] [5] and switching on IGF-1 [6], both of which are switched on by eating alone but more specifically carbs and protein.

Fasting/Time-restricted-eat, a plant-based diet (so getting all those catcheins, Anthocyanins, Polyphenols, Isothiocyanate, antioxidants and other phyto-nutrients ) with a bit of meat (1x a week, and often going for a fatty fish full of omega-3s) seems to be the ticket for long life as long as you're not a neurotic, anxious basket case about it like i am.

High protein diets put strain on kidneys and the pancreas. You can go full carnivore and have a decent looking lipid panel, have good BP, and so forth - hell, you might even solve some auto-immune issues along the way as it's probably the world's greatest elimination diet. But I'm concerned that eventually the damage from the constant mTor activiation and IGF-1 stimulation creates a tax that eventually has to be paid in some fashion or another.

I can't imagine doing without meat entirely is good for us.

I, also, can't imagine that eating meat 6+ times a week, is also good for us.

[0] https://health.usnews.com/wellness/articles/what-is-the-blue...

[0a] https://en.wikipedia.org/wiki/Seven_Countries_Study

[0b] https://thenoakesfoundation.org/news/ancel-keys-cholesterol-... (this is an 11 part series)

[1] https://www.theguardian.com/lifeandstyle/2022/feb/24/vegetar...

[2] https://www.nih.gov/news-events/nih-research-matters/protein...

[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6611156/

[4] https://www.youtube.com/watch?v=J91dVi6W6N4

[5] https://www.youtube.com/watch?v=Wg6tvKxS9FE

[6] https://www.youtube.com/watch?v=6RMUFOvcUB8