Obesity Before Age 30 Increases Early Death Risk by 70%, Major Study Finds

Men and women who reach obesity before age 30 face an approximately 70% higher risk of dying early compared to those who never become obese by age 60, according to a new study published in The Lancet.

The research, conducted by a global team of 24 researchers, analyzed data from more than 600,000 individuals in Sweden who underwent repeated weight check-ins between ages 17 and 60. The study, published this month, highlights that weight gain during young adulthood carries significantly greater health consequences than weight gain later in life.

Specifically, “high weight gain” between ages 17 and 29 was linked to an increased risk of early death—roughly an 18% increase for men and a 16% increase for women for each extra pound (measured as 0.5 kilograms) gained per year during that period.

The researchers attributed the increased mortality risk primarily to four main conditions: cardiovascular disease, type 2 diabetes, and digestive and genitourinary diseases. Examples of these conditions may include colorectal cancer, kidney issues, liver diseases, and bladder cancer, though these specific diseases were not explicitly stated as direct causes in the study.

Weight gain later in adulthood generally showed weaker associations with mortality risk, except for cancer mortality in women, where some link remained. The findings suggest that early intervention in weight management could be critical for long-term health outcomes.

The study reinforces the importance of addressing obesity prevention and healthy weight maintenance during adolescence and early adulthood, particularly as weight gained during these years may be less likely to be lost later in life and more likely to contribute to chronic disease development.