STUDY: Weight Increase Before Age 30 Associated with Elevated Mortality Risk

Published April 13, 2026

A comprehensive Swedish study involving more than 620,000 individuals tracked over several decades revealed that weight gain occurring between the ages of 17 and 29 is linked to a greater risk of death than weight gained later in life. Individuals who developed obesity before turning 30 experienced approximately a 70% higher risk of mortality compared to those who remained non-obese by age 60.

The study found that for each annual increase of 1.1 pounds during young adulthood, the risk of death rose by 18% for men and 16% for women.

Early weight gain was associated with 13 distinct causes of death in men and 12 in women, including cardiovascular disease, Type 2 diabetes, liver cancer, and kidney disease.

The median weight increase from ages 17 to 60 was roughly 40 pounds for both men and women.

Researchers highlighted the critical need for early obesity prevention efforts, pointing out that Type 2 diabetes demonstrated the strongest correlation with early patterns of weight gain.