When Obesity Meets Infection Risk
Researchers analyze data from Finnish cohorts and the UK Biobank to examine how body mass index relates to severe infections and their global burden.
By
Kathryn Wighton
February 10, 2026
1
Adults with the highest body mass index face nearly threefold higher risk of infection-related hospitalization or death.
2
Obesity contributes to approximately 8.6% of infection-related deaths globally in 2018, increasing to 15.0% in 2021.
3
Class III obesity is linked to nearly threefold higher risk of severe infections compared to individuals with healthy weight.
4
Weight loss from obesity is associated with reduced infection risk, while weight gain increases risk without returning to healthy levels.
5
The study highlights that adult obesity is a significant risk factor for infection-related mortality across various populations.
