Coffee vs green tea — which is better for longevity?

Coffee has the deeper, more broadly replicated evidence base: an umbrella review pooling 201 separate meta-analyses of observational studies found coffee consumption more often linked to benefit than harm, with the biggest reductions (17% lower all-cause mortality, 19% lower cardiovascular mortality) at 3-4 cups a day — a pattern a separate meta-analysis of 3.8 million participants also found. Green tea's evidence is real but more concentrated: it mainly comes from large Asian cohorts like the Ohsaki study, which found meaningful mortality reductions in women drinking 5+ cups daily, but a notably weaker association in men — an inconsistency coffee's evidence doesn't show to the same degree. Both associations are observational, not causal-proof RCTs, but coffee's case is currently the more extensively replicated of the two across more diverse populations.