For most healthy adults, up to 400 milligrams of caffeine per day is considered safe. This is roughly equivalent to four cups of brewed coffee.
Tolerance to caffeine varies. Some people may experience side effects like insomnia or jitters with lower amounts.
Pregnant women are advised to limit caffeine intake to less than 200 milligrams per day due to potential risks like miscarriage or other complications.
Children and teenagers should restrict caffeine since it can disrupt their growing neural systems and cause anxiety or sleep disorders.
Those with conditions like heart problems, anxiety disorders, or sleep disturbances might need to reduce or avoid caffeine.
High doses can lead to short-term effects like restlessness, upset stomach, tremors, and a fast heartbeat.
Excessive long-term consumption might lead to health issues like increased heart rate, high blood pressure, and possibly heart disorders.
Caffeine is found in coffee, tea, energy drinks, soft drinks, some medications, and dietary supplements, so total intake may be higher than expected.