But if You want to stay fit while working out of coffee, of course it is not recommended. A new study in America showed that caffeine and exercise cannot be combined. When some athletes are consuming caffeine extract to increase their stamina, even the doctors find a coffee can make blood pressure soared.
The researchers also found that two cups of coffee that was given to bikers (the person riding a bicycle) will feel the pressure. Blood flow to their arms slowly, so did their blood vessels narrow. For the athlete or who 
was fond of doing sports, be careful of drinking beverages that contain caffeine.
Drinks containing caffeine, like coffee, it's been a long time considered to be not very beneficial for the health of the body. Especially when taken in excess. The experts also discussed that caffeine has the potential for causing cancer and liver disease. Yet another study started popping up and argue when caffeine called injurious to health. Even the study say it helps health.
Caffeine alone could be as a stimulant. Two cups of coffee, was able to increase alertness and concentration. Other studies also argue, coffee can help maintain the concentration of night shift workers, reduce the potential for industrial accidents, to reduce the driver's fatigue, as well as the risk of accidents on the highway.
Caffeine also reduce symptoms of kidney stones and stones in the gall bladder. The study on women who were given preferential treatment 81.000 coffee drink 200 ml or about one cup per day showed a reduced risk of kidney stones for as much as 10%. The same results obtained from studies on 45,000 men. Making coffee is beneficial to the health of course must be taken in a number of ideal.
Recent research suggests, a moderate amount of caffeine consumption should not endanger even some evidence of benefit for health. About 4-5 cups of coffee per day on average can still be tolerated by the body's metabolism. However, to note, that number includes caffeine from other food sources. If you're already eating chocolate and other soft drink, coffee or tea should be reduced.
Inside the body, caffeine is absorbed by the stomach, it is metabolized in the liver, and disposed of the body during the 2-10 hours. Generally, smokers have the metabolism of caffeine faster than non-smokers. Whereas, in pregnant women, the metabolism of caffeine is longer. That is why for pregnant women are advised to avoid caffeine, because the results of studies on animal tests showed evidence of birth defects.
And the suggestion of a ban was issued by the FDA (food and drug supervision agency) in the early 1980s. Caffeine has reported on the contributions of fertility problems, case of miscarriage, and the development of the fetus and infants born with low weight.
So too with the women of menopause and consume less calcium should avoid high caffeine consumption. As more and more caffeine consumed, then more and more also calcium is lost through urine.
So for women who had menopause, should avoid drinks containing caffeine. While its effects on blood pressure, results of a study in the United Kingdom and the United States demonstrate the influence of tea and coffee are quite small in size. When someone drinks 1-6 cups of tea/coffee a day did not significantly increase the risk of coronary heart disease and heart attacks.