Several serious health problems are linked with heavy coffee consumption. According to Harvard University, it is safe for the average adult to consume up to three cups of coffee each day. One cup of coffee contains 8 oz. and 100 mg of caffeine. However, the typical size sold at coffee shops is 16 to 24 oz. and can contain more than 300 mg of caffeine. Many coffee drinkers consume much more than they think.
Stomach and Bowel Irritation
Heavy coffee drinkers can experience irritated stomachs and bowels. According to Bowling Green State University, more than three cups of coffee in a day can over-stimulate your digestive system and cause you to feel jittery and nervous. The caffeine from that much coffee can also interfere with some medications causing you to feel nauseous.
Heart Irregularity
According to the Cebu Cardiovascular Center, otherwise healthy people can experience heart irregularity after drinking large amounts of coffee. They say heavy coffee drinking can lead to a heart irregularity called premature ventricular contractions, or PVC. Over extended periods of time, the rapid palpitation can lead to chest pains and coronary heart disease.
Increase in Blood Pressure
According to Oregon State University, it is well-established fact that high levels of caffeine from coffee increases blood pressure. However, there are studies that show this can decrease over time as the body builds up a tolerance to caffeine. Des Moines University's website points out that coffee is especially bad for the blood pressure of people with pre-existing hypertension. They recommend avoiding coffee if you have an irregular heartbeat.
Weight Gain
Coffee drinking can lead to weight gain. Many coffee drinks sold in cafes contain surprisingly high amounts fat and calories. Whole milk, sugar and whipped cream are often added without regard to the health consequences. A 24-ounce mocha Frappuccino from Starbucks has nearly 500 calories, which is 25 percent of a typical person's recommended daily intake of calories.
Birth defects
According to Harvard University, women who consume high amounts of caffeine from coffee have an increased risk of late-term miscarriages and stillbirths. Victoria J. Drake, Ph.D., of Oregon State University says pregnant women who drink high doses of caffeine can experience spontaneous abortion, retarded fetal growth and low birth weight. The Bowling Green State University website says women who consume more than 200 mg of caffeine from coffee have twice the risk of miscarriage as women who do not drink coffee.
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