Most people associate obesity with diabetes, heart disease, and high blood pressure but new global research published in The Lancet reveals another alarming consequence: a sharply increased risk of severe infections. Drawing on large-scale data from Finnish population cohorts and the UK Biobank, researchers followed hundreds of thousands of adults for over a decade and found a clear, graded pattern: the higher the body weight, the higher the risk of infection-related hospitalisation and death. Individuals with Class III (severe) obesity faced nearly three times the risk of serious infections compared to those with a healthy weight. The increased vulnerability spanned viral, bacterial, skin, and respiratory infections, including severe illness during the COVID-19 pandemic. When these findings were applied to global estimates, researchers calculated that approximately 10.8% of infection-related deaths worldwide in 2023, roughly 600,000 deaths, could be attributed to adult obesity.

      Beyond the numbers lies a critical message: obesity may impair the body’s immune defenses. Chronic inflammation, metabolic dysregulation, and immune system alterations linked to excess adiposity likely reduce the body’s ability to fight infections effectively. Importantly, the study also showed that weight change matters, individuals who gained weight had higher infection risk, while those who lost weight experienced modest risk reductions. Obesity is therefore not just a long-term metabolic condition; it may also compromise immediate resilience against infectious diseases. As global obesity rates continue to climb, maintaining a healthy weight becomes more than a lifestyle goal, it may be a powerful strategy to strengthen the body’s defense system and reduce preventable infection-related deaths.

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