One Critical Factor Predicts Longevity Better Than Diet or Exercise, Study Finds

A 2025 observational study found that sleeping less than seven hours a night was linked to shorter life expectancy.

Researchers analyzed U.S. survey data from 2019 to 2025 and adjusted for other factors, including diet, exercise, and smoking.

The association between insufficient sleep and lower longevity was stronger than diet or exercise, though smoking showed the strongest link.

The findings suggest sleep should be treated as a major long-term health priority alongside other lifestyle habits.