Nearly 70 percent of Americans consume caffeine every day, often without thinking twice about how much—or how late. ☕
Yet inside the body, caffeine sets off a cascade of effects that can help or hinder sleep, heart health, anxiety, and even brain development. Understanding how caffeine works, and when it works against you, can make all the difference.
Learn what doctors want caffeine drinkers to know at the link in bio.
Photograph by Eric Helgas, The New York Times/Redux











