They analyzed 32 studies about protein intake that included more than 715,000 people, with follow-up periods ranging from three-and-a-half years to over three decades. Combining data from multiple studies, the researchers calculated that getting 3% more of total calories in the form of plant protein (like beans, nuts, and whole grains) lowered people's risk for premature death by 5%. Another study, published online July 13, 2020, by JAMA Internal Medicine, looked at the survival rates of more than 416,000 people who'd reported their diet and lifestyle information 16 years earlier (when they were 50 to 71 years old).

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