Caffeine: How much is too much?
I rely on caffeine to get through busy days. My routine usually includes one or two cups of tea in the morning and a latte later on when I need an energy lift. Before races or other demanding events, I often consume extra coffee for the added boost it provides.
Individual tolerance varies, but health professionals generally consider 200–400 mg of caffeine per day—roughly the amount in 2–4 cups of brewed coffee—to be safe for most adults and potentially linked to certain health benefits.
Caffeine stimulates the central nervous system and can raise metabolic rate, reduce feelings of fatigue, increase alertness, and sharpen focus. Research also suggests an association between moderate caffeine intake and a lower risk of some chronic conditions, and athletes commonly use caffeine to enhance performance.
Problems can start when daily intake climbs above about 500–600 mg. Many people underestimate how much caffeine they consume because it appears in foods, beverages, and over-the-counter products such as some pain relievers and weight-loss supplements. Since manufacturers are not always required to list caffeine content on labels, it can be difficult to know how much caffeine a product contains.
Below are common signs that your caffeine intake may be excessive.
Signs that You’re Getting Too Much Caffeine
Consider reducing caffeine if you experience one or more of these symptoms:
- Difficulty falling or staying asleep (insomnia)
- Heightened nervousness or anxiety
- Restlessness
- Increased irritability
- Stomach discomfort or upset
- Rapid or irregular heartbeat
- Muscle tremors or shaking
Pregnancy and Caffeine
Guidance for pregnant women has evolved. While older advice recommended complete avoidance, the American College of Obstetricians and Gynecologists now considers up to 200 mg of caffeine a day to be acceptable during pregnancy.
Written by:
Julie Upton, M.S., R.D., CSSD
Co-Founder, Appetite for Health