Changing your diet could add up to a decade to life expectancy, study finds

A young adult in the US could add more than a decade to their life by changing their diet from a typical Western diet to an optimized diet.

[Feb 8, 2022: Claire Turner, PLOS]

Substituting 10% of daily caloric intake from beef and processed meats for a mix of fruits, vegetables, nuts, legumes and select seafood could allow people to gain 48 minutes of healthy minutes per day. (CREDIT: Getty Images)

A young adult in the U.S. could add more than a decade to their life expectancy by changing their diet from a typical Western diet to an optimized diet that includes more legumes, whole grains and nuts, and less red and processed meat, according to a new study publishing February 8th in PLOS Medicine by Lars Fadnes of the University of Bergen, Norway, and colleagues. For older people, the anticipated gains to life expectancy from such dietary changes would be smaller but still substantial.



Food is fundamental for health and, globally, dietary risk factors are estimated to lead to 11 million deaths and 255 million disability-adjusted life-years annually. In the new study, researchers used existing meta-analyses and data from the Global Burden of Diseases study to build a model that enables the instant estimation of the effect on life expectancy of a range of dietary changes. The model is also now available as a publicly available online tool called the Food4HealthyLife calculator.

Expected increase in life expectancy for optimizing different food groups from various ages. (CREDIT: Fadnes LT et al., 2022, PLOS Medicine)

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For young adults in the United States, the model estimates that a sustained change from a typical Western diet to the optimal diet beginning at age 20 would increase life expectancy by more than a decade for women (10.7 [uncertainty interval 5.9-14.1] years) and men (13.0 [6.9-17.3] years).

The largest gains in years of life expectancy would be made by eating more legumes (females: 2.2 [1.0-3.4]; males: 2.5 [1.1-3.9]), more whole grains (females: 2.0 [0.7-3.3]; males: 2.3 [0.8-3.8]), and more nuts (females: 1.7 [0.8-2.7]; males: 2.0 [1.0-3.0]), less red meat (females: 1.6 [0.7-2.5]; males: 1.9 [0.8-3.0]) and less processed meat (females: 1.6 [0.7-2.5]; males: 1.9 [0.8-3.0]).

Changing from a typical diet to the optimized diet at age 60 years could still increase life expectancy by 8.0 (4.8-11.2) years for women and 8.8 (5.2-12.5) years for men, and 80-year-olds could gain 3.4 years (females: 2.1-4.7 and males: 2.1-4.8) from such dietary changes.

“Understanding the relative health potential of different food groups could enable people to make feasible and significant health gains,” the authors say. “The Food4HealthyLife calculator could be a useful tool for clinicians, policy makers, and lay-people to understand the health impact of dietary choices.”



Fadnes adds, “Research until now have shown health benefits associated with separate food group or specific diet patterns but given limited information on the health impact of other diet changes. Our modeling methodology has bridged this gap.”


Note: Materials provided above by PLOS. Content may be edited for style and length.


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Tags: #New_Discoveries, #Good_News, #Longevity, #Food, #Healthy_Eating, #Medical_News, #Science, #Research, #The_Brighter_Side_of_News


Joseph Shavit
Joseph ShavitScience News Writer, Editor and Publisher

Joseph Shavit
Science News Writer, Editor-At-Large and Publisher

Joseph Shavit, based in Los Angeles, is a seasoned science journalist, editor and co-founder of The Brighter Side of News, where he transforms complex discoveries into clear, engaging stories for general readers. With experience at major media groups like Times Mirror and Tribune, he writes with both authority and curiosity. His work spans astronomy, physics, quantum mechanics, climate change, artificial intelligence, health, and medicine. Known for linking breakthroughs to real-world markets, he highlights how research transitions into products and industries that shape daily life.