Harmful Effects of Caffeine

Caffeine stimulates the central immune system, waking you up and increasing your alertness. However, caffeine also bodes harmful effects. These effects vary by gender, age, body mass and health conditions.

• Soda is one popular source of caffeine.

Heart Effects

• Caffeine raises blood pressure and make the heart pump harder. Consequently, caffeine can lead to irregular heart beats. Alcohol compounds these effects.

Gastrointestinal Problems

• Caffeine can cause nausea and other gastrointestinal problems. It also stimulates thermogenesis, which creates a burning sensation in the stomach.

Irritability

• Irritability is often the cause of caffeine's other effects, such as headaches, anxiety, restlessness, nervousness and insomnia.

Dehydration

• Caffeine is a diuretic, meaning it increases the amount of urine you excrete. Consequently, caffeine can lead to dehydration if you don't drink enough fluids.

Expert Insight

• The Mayo Clinic recommends a caffeine limit of 500 to 600 mg per day. In addition to coffee, tea and soda, caffeine is found in some candies and over-the-counter medications.