The literature on the relationship between BMI and mortality is not conclusive except for a BMI > 30. Generally it seems that lower mortality is associated with

The literature on the relationship between BMI and mortality is not conclusive except for a BMI > 30. Generally it seems that lower mortality is associated with a body mass index of 20-25. https://www.nejm.org/doi/full/10.1056/NEJMoa1000367 https://www.nejm.org/doi/full/10.1056/NEJMoa1000367 However there are studies which find lowest mortality for the slightly overweight with BMI < 30. For instance: https://jamanetwork.com/journals/jama/fullarticle/1555137 https://jamanetwork.com/journals/jama/fullarticle/1555137 and https://www.frontiersin.org/articles/10.3389/fphys.2022.857787/full https://www.frontiersin.org/articles/10.3389/fphys.2022.8577...