Two large cohort studies just published in the Annals of Internal Medicine showed associations between coffee drinking and a lower likelihood of dying. But these studies do not in any way prove that drinking coffee can prolong your life. No matter how well you construct and execute a cohort study, a cohort study can never prove cause and effect. At their worst, cohort studies lump together people in broad categories and can lead to premature conclusions and stereotyping. For example, cohort studies have suggested that Whites drink more alcohol than other races.

Source: Forbes July 11, 2017 05:28 UTC