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Some of the harmful effects of coffee

 

Health risks

Excessive amounts of coffee can cause very unpleasant and even life-threatening adverse effects. Coffee's adverse effects are more common when taken in excess. Many of coffee's health risks are due to its caffeine content and can therefore be avoided by drinking decaffeinated coffee.

Oily components called diterpenes are present in unfiltered coffee and coffee brewed using metal filters, but not in coffee brewed using paper filters.[136] The two diterpenes present in coffee, kahweol and cafestol, have been associated with increased risk of coronary heart disease via elevation of low-density lipoprotein (LDL) levels in blood.

 

Overview of effects of moderate consumption of caffeine, a main active component of coffee               

Elderly individuals with a depleted enzymatic system do not tolerate coffee with caffeine well. Moderate amounts of coffee (50–100 mg of caffeine or 5–10 g of coffee powder a day) are well tolerated by most elderly people

Coffee consumption can lead to iron deficiency anemia by interfering with iron absorption, especially in mothers and infants.Coffee's interference with iron absorption is due to the polyphenols it contains. However, excess iron is carcinogenic to the liver. Therefore, coffee consumption's negative correlation with the development of liver cancer is also attributed to polyphenols.

Although some chemicals in coffee are carcinogens in rodents at very high doses, research suggests that they are not dangerous at the levels consumed by humans. Instant coffee has a much greater amount of acrylamide than brewed coffee.Research suggests that drinking caffeinated coffee can cause a temporary stiffening of arterial walls Coffee may aggravate pre-existing conditions such as migraines, arrhythmias, and cause sleep disturbances It was once thought that coffee aggravates gastroesophageal reflux disease but recent research suggests no link

Caffeine can cause anxiety, especially in high doses and in those with pre-existing anxiety disorders.

Some research suggests that a minority of moderate regular caffeine consumers experience some amount of depression, anxiety, low vigor, or fatigue when discontinuing their caffeine use However, the methodology of the these studies has been criticized. Withdrawal effects are more common and better documented in heavy caffeine users.

About 15% of the U.S. general population reports having stopped drinking coffee altogether, citing concerns about their health and the unpleasant side effects of caffeine.

A 2013 study by Liu et al. published in Mayo Clinic Proceedings established a correlation between coffee consumption >28 cups per week (>4 cups per day) and an increase in all-cause mortality in the total population of men and in men and women younger than 55 years This correlation was not statistically significant for people aged 55 years and older. The authors noted that certain limitations exist in the study, such as a lack of data on different coffee preparations that can vary the overall composition of coffee's constituent compounds (e.g., cafestol, kahweol), which could impact CVD risk factors; a lack of data on marital status and total energy consumption; and possible residual confounding from health-risk factors such as smoking. One of the study's co-authors stated, "We're not saying that coffee is the cause of death; we just noticed coffee is associated with increased risk of death," which addresses the distinction between correlation and causation.

 

 

 

 Reference :  http://en.wikipedia.org/wiki/Coffee