Obesity overtakes smoking as top cause of premature heart disease deaths

Obesity has overtaken smoking as the leading modifiable risk factor for premature heart disease deaths, according to a global study published today, with midlife adults and low- and middle-income countries bearing the brunt of the surge. The findings, released on 15 June 2026 by researchers at the Global Cardiovascular Risk Consortium, show that excess body weight now accounts for one in five heart disease fatalities in adults aged 30–69, up from one in eight a decade ago.

Analysing data from 186 countries between 2010 and 2024, the study found that obesity-related heart disease deaths rose by 42% in developing nations during that period, compared with 18% in high-income countries. “The shift is stark,” said lead author Dr. Fatima Chen of the University of Geneva. “Where once tobacco and hypertension dominated, obesity is now the primary driver of preventable cardiovascular mortality.” The research, published in *The Lancet Global Health* , attributes the trend to rising ultra-processed food consumption, sedentary lifestyles, and limited access to primary care in lower-income regions.

In high-income countries, the burden remains concentrated among younger adults. Deaths from obesity-linked heart disease in the 30–49 age group increased by 34% since 2010, reversing decades of progress in cardiovascular health. “We’re seeing patients in their 40s with heart failure who would have been in their 60s a generation ago,” noted cardiologist Prof. Lars Bergström of Karolinska Institutet, whose clinic in Stockholm has recorded a 28% rise in obesity-related admissions over the past five years .

Public health experts warn that current interventions are insufficient. The World Health Organization’s 2025 target to halt obesity growth by 2030 is already off track, with global obesity prevalence reaching 22% in adults—up from 13% in 2010. “Policy responses have been too slow,” said Dr. Chen. “Taxes on sugary drinks, front-of-pack warning labels, and urban planning that prioritises active transport are proven measures that need urgent scaling.”

The study’s authors call for coordinated action across sectors, citing successful programmes in Chile and Mexico where front-of-pack labels reduced sugary drink purchases by 24% within two years. Yet in many low-income countries, weak regulatory frameworks and food industry lobbying continue to delay implementation. “The cost of inaction is measured in lives,” said Prof. Bergström. “We’re not just talking about heart disease—obesity is a gateway to diabetes, stroke, and kidney failure.” With no signs of abating, the obesity epidemic is reshaping global health priorities for decades to come.