In the event you’ve ever downed an additional cup of espresso earlier than a run since you figured extra caffeine meant higher efficiency, you are not alone. The concept that greater doses equal greater positive factors is deeply baked into health tradition. However a new systematic assessment and meta-analysis1 suggests the connection between caffeine and endurance is extra nuanced than that, and that you could be be getting a lot of the profit lengthy earlier than you attain the doses many athletes default to.