There is some evidence that coffee drinking may be protective against gallstone formation in men and women. The study shows that regular coffee drinkers (four or more cups a day) have 25 percent less chance of developing gallstones compared to those who drink none.
These were benefits of coffee drinking. Now let’s look at the potential health risks associated with coffee. Coffee, mainly in large doses, can cause several problems for susceptible persons. However, despite several detrimental health effects, people who drink coffee regularly are not at increased risk of mortality.
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Coffee is a complex mixture of compounds that may have either beneficial or harmful effects on the cardiovascular system. On one hand, diterpenes cafestol and kahweol present in unfiltered coffee and caffeine each appear to increase risk of coronary heart disease. High quality studies (randomized controlled trials) have confirmed the cholesterol-raising effect of diterpenes, which may contribute to the risk of coronary heart disease. On the other hand, a lower risk of heart disease among moderate coffee drinkers might be due to antioxidants found in coffee.
Besides that, coffee consumption is also associated with an increase of plasma homocysteine, a risk factor for coronary heart disease.
Coffee was always considered an adult drink
Coffee is potentially protective against the development of type 2 diabetes. US Nurses Health Study found that moderate drinking of coffee may lower the risk of type 2 diabetes in younger and middle aged women. The finding that higher consumption of decaffeinated coffee was also associated with a redused risk of diabetes suggests that the protective effect could not be attributed exclusively to caffeine, but rather should be explained by various antioxidants, most probably chlorogenic acid.
Drinking because it tastes good
Although coffee consumption is not a significant risk factor for hypertension, it produces unfavourable effects on blood pressure. No doubt caffeine is responsible for blood pressure increase. People prone to hypertension may be more susceptible to coffee blood pressure elevating effects. But even in people who don't have high blood pressure, caffeine can cause a short, but significant increase in blood pressure.
Teens are participating in the coffee craze
According to Las Vegas ABC affiliate KTNV and one unnamed, seemingly random old man they interviewed, coffee-smoking is "going viral" with teens, who learn how to do it from websites that apparently popping up like weeds.
Adolescents drink too much caffeine - Medical News Today
Coffee can impair absorption of calcium from the digestive tract and may induce an extra urinary excretion of calcium. Heavy coffee drinking (4 cups=600 ml or more) can modestly increase the risk of osteoporosis, especially in women with a low calcium intake
Teenagers are drinking too much caffeine, ..
Rolling coffee up into "caffeine sticks" and smoking it is a hot new trend, and it's turning America's teens into "bean-heads," according to one specious local news report.