Methionine restriction has been studied in animal models to extend lifespan. Grains are considerably lower in methionine than animal products. And comparing animal products, dairy is lower in methionine content than meat, fish, and eggs. So did adopting a diet high in grain protein and higher in dairy protein than animal flesh protein increase our lifespan through methionine restriction?
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The average life expectancy has doubled in the last ~200 years and minor changes over the previous 15,000.
Why? Sanitation and Modern Medicine.
Lol, can I rephrase this question to "Did man's evolution towards eating incomplete proteins extend his lifespan?" To which I'd reply, only to the extent that it gave paleo man a more regular food supply so be didn't starve.