BMI and all-cause mortality: IPD meta-analysis of 239 prospective studies Strong Body Mass Index (BMI)Meta-analysisObservational evidenceReverse causation risk Meta-analysis Vs BMI 22.5–<25: obesity 30–<35 HR 1.45; 35–<40 HR 1.94; 40–<60 HR 2.76 Causal status: Predominantly association; causal contribution plausible Reliability / bias notes: Muscle mass and fat distribution; low-BMI reverse causation Global BMI Mortality Collaboration · Lancet · 2016 · PMID 27423262 Read the study →