Childhood obesity raises lifelong heart disease risk by 53%, study warns

A new study has revealed stark links between childhood obesity and long-term heart risks. Researchers found that persistent overweight from childhood into early adulthood increases the chance of coronary heart disease by 53%. The findings, published in JAMA Pediatrics, also highlight how weight normalisation before adulthood can offset these dangers.

The study analysed data from over 103,000 people born in Gothenburg, Sweden, between 1945 and 1968. Led by Jenny Kindblom and her team, it tracked weight patterns from childhood to adulthood and their impact on cardiovascular health.

Obesity rates in Sweden have shifted dramatically over the decades. In the 1940s, fewer than 1% of children and adolescents were overweight. By the 1970s, this figure crept up to 2-4% and remained stable until the 1990s. Since then, the numbers have doubled or tripled, with 4-8% of children and 15-20% of teenagers now affected, according to national surveys and WHO reports.

Those overweight in both childhood and early adulthood faced a 53% higher risk of coronary heart disease later in life. Even more striking, obesity emerging in puberty alone raised the risk by 83% compared to those who never carried excess weight. However, individuals who normalised their weight before early adulthood showed no greater risk than those who stayed at a healthy weight throughout.

Globally, childhood obesity is a growing concern. A UNICEF report shows 9.4% of children and adolescents aged 5 to 19 are obese, while 9.2% remain underweight. In the U.S., the figures are higher, with 41% of young people and 55% of adults classified as overweight or obese.

The researchers stressed that early detection and intervention are crucial. Tackling obesity in childhood and adolescence could significantly reduce future heart disease risks, they concluded.

The findings underline the importance of addressing obesity early in life. Those who remain overweight from childhood into adulthood face a substantially higher risk of coronary heart disease. However, normalising weight before early adulthood appears to eliminate this extra risk, offering a clear path to better long-term health.