What are the effects of coffee? Studies have shown this can boost the person's alertness, improve performance and concentration. Internally, this means an increase in the heart rate, blood pressure and basal metabolic rate. It will also promote urine production and can help relax muscle tension. It is because of this that many use coffee while studying for an exam, to help wake up in the morning or while working through the night.

The main ingredient in coffee is caffeine. Research shows that it is safe to drink one or two cups a day. However, those who exceed this may suffer the negative effects that include difficulty sleeping, headaches, irregular heartbeat, nausea and muscle tension. This may also lead to ulcer or heartburn, which is why experts also advise people to drink moderately.

Coffee isn't good for women who are pregnant or patients who have heart disease should avoid it since it could cause birth defects and other health problems.

But those who drink coffee may also experience the same effects by drinking substances that contain caffeine. Examples of these are tea, sodas and chocolates.

Coffee may not make the person do something foolish which is usually associated with the use of illegal substances or alcohol. But it can be habit forming. Those who drink it on a regular basis and suddenly stop may experience what is known as withdrawal effects that will disappear after a day or two when they are able to once again have a cup of coffee.

But coffee has been known to prevent certain diseases. Java for instance is effective as an anti-depressant. Others are known to lessen the chances of developing Parkinson's disease in men even if doctors aren't yet able to determine the cause of this disease.

Coffee is being consumed in almost every household. It can be purchased from the store or brewed at home or in the office. The effects it has on one person may vary with another depending on how well the body is able to react to the caffeine so when the individual has felt this is enough, it is time to stop rather than feeling the negative effects of consuming too much.