Caffeine increases heartbeat, respiration, metabolic rate, and the production of stomach acid and urine; and it relaxes smooth muscles, including the bronchial muscle. These changes vary among people and depend upon the individual’s sensitivity to this drug, their metabolism and whether the consumer habitually uses or rarely uses caffeine (ie. their tolerance to the drug). How long the effects last is influenced by the person’s hormonal status, whether he/she uses tobacco or takes medications or if they have a disease that impairs liver functioning.
These effects can begin as early as 10-20 minutes after ingestion. Maximum effects are reached in about 30-60 minutes.
There is some evidence linking caffeine heart problems, fibrocystic breast disease(FBD), ulcers and other stomach disorders in regular users. It has also been suggested as a possible cause of cancer and birth defects.
Source: www.Ag-Nutri.Com.br
Short info about caffeine:
People around the world love caffeine and its consumption rate is based on about 90% of all adults. Half the adults in the America have a consumption rate of over 300mg of pure caffeine powder coming from sources such as tea, cola, coffee, chocolate, etc., making it the most consumed drug in the country, while Europeans have a slightly lover consumption rate of caffeine they are close to American standards.
Caffeine is mainly consumed for a person to pick up their energy level, to become more alert, and is used to keep a person awake or increase concentration and promote better endurance in physical activities.
A side effect of caffeine is that it causes more frequent urination, which is why a general intake of no more than 300-400mg of caffeine pr. day is recommended for humans.
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Dependency:
Regular caffeine consumption creates a tolerance to caffeine. When the caffeine intake is then reduced, blood pressure drops dramatically, causing an excess of blood in the head (though not necessarily on the brain), leading to a headache.
This headache, well known among coffee drinkers, usually lasts from one to five days, and can be alleviated with over-the-counter analgesics such as aspirin. It can also be alleviated with caffeine intake. Many analgesics, in fact, contain some caffeine.
Other symptoms can include irritability, nervousness, and feeling sleepy, as well as having the caffeine headache.
Source: http://www.bulkcaffeinepowder.com/CaffeinePowder1.html
