As far as I'm aware the best meta-analysis shows that life expectancy peaks somewhere between 2 to 4 cups per day. https://www.cambridge.org/core/journals/brit

As far as I'm aware the best meta-analysis shows that life expectancy peaks somewhere between 2 to 4 cups per day. https://www.cambridge.org/core/journals/british-journal-of-nutrition/article/coffee-consumption-and-total-mortality-a-metaanalysis-of-twenty-prospective-cohort-studies/179C220445D97D63E02A5C9B9FEAFED8 https://www.cambridge.org/core/journals/british-journal-of-n... It would be crazy to think that that's strictly causal but I think it does show that people who care about their health can drink 3 cups a day happily.