Drinking coffee reduces the risk of death from any cause. Do not drink more than 3-5 cups per day. Caffeine is also found in black and green tea.
Song-Yi Park, PhD; Neal D. Freedman, PhD; Christopher A. Haiman, ScD; Loïc Le Marchand, MD, PhD; Lynne R. Wilkens, DrPH; Veronica Wendy Setiawan, PhD. Association of Coffee Consumption With Total and Cause-Specific Mortality Among Nonwhite Populations. Annals of Internal Medicine. Original Research |11 July 2017 http://annals.org/aim/article/2643433/association-coffee-consumption-total-cause-specific-mortality-among-nonwhite-populations
Marc J. Gunter, Ph; Neil Murphy, PhD; Amanda J. Cross, PhD et al Coffee Drinking and Mortality in 10 European Countries: A Multinational Cohort Study Annals of Internal Medicine. Original Research |11 July 2017 http://annals.org/aim/article/2643435/coffee-drinking-mortality-10-european-countries-multinational-cohort-study