Time restricted eating means limiting food to a set daily window, for example eating within 8 to 12 hours and fasting the rest of the day.
In a large US study of older adults, longer fasting windows were linked to a higher risk of death from heart disease.
The lowest risk appeared around an eating window that leaves about 11 and a half hours of fasting. Very short fasting windows were not the safest option for this age group.
The study used national survey data and followed people over time, so it shows association, not proof of cause.
The link with heart disease death was strongest in men and in people over 70.
Shorter fasting windows were not tied to lower overall death, and the pattern for cancer and other causes was different.
What this means in practice is simple. For people who are older, strict time restricted eating with very long daily fasts may not be wise. Any fasting plan should be personal, and it should fit one’s health, medicines, and daily life. Trials that test different eating windows in older adults are still needed.
A National Study Exploring the Association between Fasting Duration and Mortality among the Elderly – June 26, 2024
Using US NHANES data on adults aged 60 and older, the authors found that very long daily fasting periods were associated with a higher risk of death from cardiovascular disease. The relation with death risk was non linear, with the lowest estimated risk near 11.5 hours of fasting. Patterns differed for other causes of death. The study is observational, so it cannot prove cause.
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