whether the coffee is useful for the health or vice versa  

Scientific studies have examined the relationship between coffee consumption and an array of medical conditions. Findings have been contradictory as to whether coffee has any specific health benefits, and results are similarly conflicting regarding the potentially harmful effects of coffee consumption. Variations in findings, however, can be at least partially resolved by considering the method of preparation. Coffee prepared using paper filters removes oily components called diterpenes that are present in unfiltered coffee. Two types of diterpenes are present in coffee: kahweol and cafestol, both of which have been associated with increased risk of coronary heart disease via elevation of low-density lipoprotein (LDL) levels in blood. Metal filters, on the other hand, do not remove the oily components of coffee.

In addition to differences in methods of preparation, conflicting data regarding serving size could partially explain differences between beneficial/harmful effects of coffee consumption. Prevention of multiple chronic diseases has been associated with coffee consumption ranging from one to ten cups[citation needed].

Coffee not only be useful to prevent drowsiness. A study proves, habits sipping a cup of coffee each day can prevent dementia.

Caffeine contained in coffee may improve brain abnormalities cause Alzheimer's disease or better known as senile.

Alzheimer's usually affects the elderly, the drugs would not be chosen too hard. Therefore, caffeine is considered the safest substances to be consumed by the elderly.

According to research conducted in the United States, caffeine is readily absorbed and fixed brain damaged areas in the brain.

The main cause of Alzheimer's is a blockage of a protein in the brain. Caffeine can dilute proteins that clog earlier. Alzheimer's disease can be prevented so.

But too much caffeine will also affect your heart rate. So that experts recommend to sip a cup of black coffee every day and no more.

Overview of the more common effects of caffeine, a main active component of coffee

Coffee consumption has been shown to have minimal or no impact, positive or negative, on cancer development;however, researchers involved in an ongoing 22-year study by the Harvard School of Public Health state that "the overall balance of risks and benefits [of coffee consumption] are on the side of benefits." Other studies suggest coffee consumption reduces the risk of being affected by Alzheimer's disease, Parkinson's disease, heart disease, diabetes mellitus type 2, cirrhosis of the liver, and gout. A longitudinal study in 2009 showed that those who consumed a moderate amount of coffee or tea (3–5 cups per day) at midlife were less likely to develop dementia and Alzheimer's disease in late-life compared with those who drank little coffee or avoided it altogether. It increases the risk of acid reflux and associated diseases. Most of coffee's beneficial effects against type 2 diabetes are not due to its caffeine content, as the positive effects of consumption are greater in those who drink decaffeinated coffee.The presence of antioxidants in coffee has been shown to prevent free radicals from causing cell damage.�

In a healthy liver, caffeine is mostly broken down by the hepatic microsomal enzymatic system. The resulting metabolites are mostly paraxanthines-theobromine and theophylline-and a small amount of unchanged caffeine is excreted by urine. Therefore, the metabolism of caffeine depends on the state of this enzymatic system of the liver. Elderly individuals with a depleted enzymatic system do not tolerate coffee with caffeine. They are recommended to take decaffeinated coffee, and this only if their stomach is healthy, because both decaffeinated coffee and coffee with caffeine cause heartburn. 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. Excessive amounts of coffee, however, can, in many individuals, cause very unpleasant, exceptionally even life-threatening adverse effects.�

Coffee consumption can lead to iron deficiency anemia in mothers and infants.Coffee also interferes with the absorption of supplemental iron. Interference with iron absorption is due to the polyphenols present in coffee. Although the inhibition of iron absorption can cause an iron deficiency, iron is considered a carcinogen in relation to the liver and can increase risks of hepatocellular carcinoma, more commonly known as liver cancer. Polyphenols contained in coffee are therefore associated with decreasing the risk of liver cancer development.

American scientist Yaser Dorri has suggested that the smell of coffee can restore appetite and refresh olfactory receptors. He suggests that people can regain their appetite after cooking by smelling coffee beans, and that this method can also be used for research animals.�

Over 1,000 chemicals have been reported in roasted coffee; more than half of those tested (19/28) are rodent carcinogens.Coffee also contains healthful chemicals, including polyphenols (chlorogenic acid and caffeic acid), as well as diterpenes (kahweol and cafestol). Coffee's negative health effects are often blamed on its caffeine content. Research suggests that drinking caffeinated coffee can cause a temporary increase in the stiffening of arterial walls. Caffeinated coffee is not recommended for everybody. It may aggravate preexisting conditions such as gastroesophageal reflux disease, migraines, arrhythmias, and cause sleep disturbances.�

Coffee is no longer thought to be a risk factor for coronary heart disease. One study suggests that it may have a mixed effect on short-term memory, by improving it when the information to be recalled is related to the current train of thought but making it more difficult to recall unrelated information. Caffeine has been associated with its ability to act as an antidepressant. A review by de Paulis and Martin indicated a link between a decrease in suicide rates and coffee consumption, and suggested that the action of caffeine in blocking the inhibitory effects of adenosine on dopamine nerves in the brain reduced feelings of depression.A 1992 study concluded that about 10% of people with a moderate daily intake (235 mg per day) experienced increased depression and anxiety when caffeine was withdrawn,but a 2002 review of the literature criticised its methodology and concluded that "the effects of caffeine withdrawal are still controversial." About 15% of the U.S. general population report having stopped drinking coffee altogether, citing concern about health and unpleasant side effects of caffeine.

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