Vegans! Why do humans live much longer than chimps—almost twice as long? The answer appears to be meat...

(Science News) In spite of their genetic similarity to humans, chimpanzees and great apes have maximum lifespans that rarely exceed 50 years. The difference, explains USC Davis School of Gerontology Professor Caleb Finch, is that as humans evolved genes that enabled them to better adjust to levels of infection and inflammation and to the high cholesterol levels of their meat rich diets...

...William F. Kieschnick Professor in the Neurobiology of Aging and a distinguished University Professor, argues that a major contributor to longevity for humans is the genes that adapt to higher exposure to inflammation.
"Over time, ingestion of red meat, particularly raw meat infected with parasites in the era before cooking, stimulates chronic inflammation that leads to some of the common diseases of aging," Finch said.


So, there...
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And why did our ancestors need to eat meat? Because the human brain is so expensive. The brain is only 5 percent of the body and yet it demands 20 percent of the energy from food.