Caffeine, in moderate amounts, is generally safe for most people. However, excessive consumption of caffeine can have harmful effects on the body. Some of the potential harms of caffeine include increased heart rate and blood pressure, nervousness, anxiety, restlessness, insomnia, and gastrointestinal problems such as indigestion and diarrhea. Over time, excessive caffeine consumption can also lead to tolerance, dependence, and withdrawal symptoms such as headaches, fatigue, and irritability. Pregnant women and individuals with certain medical conditions, such as anxiety disorders, heart problems, and high blood pressure, are particularly vulnerable to the harmful effects of caffeine and should limit their consumption accordingly. Controlling your intake with a caffeine calculator can solve these problems.