Caffeine is a bitter white crystalline alkaloid. Its chemical formula is CaH10N4O2. Caffeine also affects the human body. It is widely consumed by people of all ages. In the last period a market of caffeine-containing products, particularly energy drinks and food supplements increased. Caffeine for years is under discussion, whether it has positive adverse impact on health. Children are a group of special anxieties. Caffeine is a stimulant of central nervous system and therefore is probably the most commonly used psychoactive substance in the world. The physiological effect of caffeine and the lack of nutrition value cause a great interest its impact on health, especially with reference to the risk of cardiovascular diseases. According to the current knowledge moderate caffeine intake by healthy adults at a dose level of 400 mg a day is not associated with adverse effects, but it also depends on other health determinants of a lifestyle. Excessive caffeine consumption can cause negative health consequences such as psychomotor agitation, insomnia, headache, gastrointestinal complaints. Adverse effect of caffeine in intoxication is classified in world Health Organization’s Classification of Diseases. Adolescents should limit daily caffeine consumption. It results from the influence of caffeine on the central nervous system in the period of rapid growth and the final stage of brain development, calcium balance and sleep duration. Average daily caffeine consumption in countries what results from the great consumption of the coffee. As far as caffeine consumption by polish population is concerned there is very few data in this subject so far. In the nineties of previous century it was 141 mg per day, whereas according to recent survey daily caffeine intake by women from the Warsaw region was 251 mg and 51% of examined women consumed an excessive quantity of caffeine. Smokers consume more caffeine than nonsmokers, similarly to people with...
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