Coffee is probably the best ingredient for performance and longevity

Research finds regular coffee consumption is linked with improved mental and physical performance and a lower dementia risk for people who drink about two to three cups daily, while higher amounts can cause side effects such as jitters and sleep disruption.

Coffee is a common daily habit and a focus of recent health research. About 66% of American adults drink coffee daily. Studies link coffee with longer life and with improvements in mental and physical performance, and a February JAMA study reported a lower dementia risk for people who drank two to three cups daily. Researchers point to caffeine and plant compounds such as chlorogenic acid as likely contributors. What we know now: - Caffeine is widely identified as a consistent driver of performance effects, improving alertness, reaction time, endurance, and stamina, and many athletes include caffeine in their routines. - A JAMA study reported that two to three cups of coffee daily were associated with a lower risk of dementia. - Decaffeinated coffee is not consistently linked with the same benefits, suggesting caffeine plays a key role, though coffee also contains polyphenols like chlorogenic acid that may reduce inflammation and protect cells. - Coffee provides a small amount of dietary fiber that can support gut health, and tea contains similar plant compounds with lower caffeine content for those sensitive to stimulants. - Excessive caffeine can cause indigestion, jitters, anxiety, rapid heart rate, and headaches; studies note side effects may occur at levels around 400 milligrams per day (about three cups for many people), and extreme doses would require very large short-term intake. - Timing matters for sleep. One expert reported limiting caffeine after mid-afternoon because caffeine can take several hours to clear from the body, which may affect sleep and related health outcomes. Summary: Taken together, current research associates moderate regular coffee intake with multiple performance and longevity-related outcomes while noting possible side effects at higher doses and that some forms of sweetened or milk-heavy coffee may not show the same links. Researchers continue to examine which specific compounds and consumption patterns are responsible for these effects. Undetermined at this time.