Abstract

--- - Adherence to healthy dietary patterns can prevent the development of non-communicable diseases and affect life expectancy. Here, using a prospective population-based cohort data from the UK Biobank, we show that sustained dietary change from unhealthy dietary patterns to the Eatwell Guide dietary recommendations is associated with 8.9 and 8.6 years gain in life expectancy for 40-year-old males and females, respectively. In the same population, sustained dietary change from unhealthy to longevity-associated dietary patterns is associated with 10.8 and 10.4 years gain in life expectancy in males and females, respectively. The largest gains are obtained from consuming more whole grains, nuts and fruits and less sugar-sweetened beverages and processed meats. Understanding the contribution of sustained dietary changes to life expectancy can provide guidance for the development of health policies. - The UK Government aims to reduce premature deaths from non-communicable diseases by one-third by 2030 (SDG 3). Using life table methodology and data from the UK Biobank, this study indicates that sustained dietary changes-from median or unhealthy to a longevity-associated dietary pattern or to the Eatwell Guide recommendations-could lead to substantial life expectancy gains.