Caffeine acts as a stimulant in the central nervous system, which leads to a boost in alertness and energy, research shows. No wonder so many people make a beeline for Starbucks when they’re busy or short on snooze time. Indeed, according to survey data from the National Coffee Association reported by Reuters, Americans are drinking more coffee than ever. In the survey of about 3,000 people, 64 percent of American adults reported having a cup of coffee the prior day in 2018. That’s an increase from 62 percent in 2017 — and those results don’t account for the caffeine we get from other sources.
