Café, os efeitos negativos na saúde

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Café, os efeitos negativos na saúde

Mensagem  Diogo Gonçalves em Seg Out 19, 2009 1:59 pm

O café é algo mais do que uma bebida. Na América do Norte e na Europa, o consumo de café é um terço do consumo de água canalizada; foi ainda a 7ª mercadoria agrícola legal mais exportada em termos de valor em 2005.

6,7 milhões de toneladas foram produzidas anualmente entre 1998-2000. 67000000 Kg uns quantos expressos....

Vou abordar os efeitos do café para a saúde humana.


Scientific studies have examined the relationship between coffee consumption and an array of medical conditions. Findings are contradictory as to whether coffee has any specific health benefits, and results are similarly conflicting regarding the negative effects of coffee consumption.[9]

Coffee consumption can lead to iron deficiency anemia in mothers and infants.[79] Coffee also interferes with the absorption of supplemental iron.[80]
Research suggests that drinking caffeinated coffee can cause a temporary increase in the stiffening of arterial walls.[83] Coffee is no longer thought to be a risk factor for coronary heart disease.[84] Some studies suggest 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.[85] About 10% of people with a moderate daily intake (235 mg per day) reported increased depression and anxiety when caffeine was withdrawn.[86] About 15% of the general population report having stopped drinking coffee altogether, citing concern about health and unpleasant side effects of caffeine.[87]

Com tanto dinheiro envolvido, esta página deve estar bem "escrutinada", por isso vamos ver a dedicada à cafeína, não deve estar muito melhor, mas talvez diga mais qualquer coisa.


In large amounts, and especially over extended periods of time, caffeine can lead to a condition known as caffeinism.[76][77] Caffeinism usually combines caffeine dependency with a wide range of unpleasant physical and mental conditions including nervousness, irritability, anxiety, tremulousness, muscle twitching (hyperreflexia), insomnia, headaches, respiratory alkalosis, and heart palpitations.[78][79] Furthermore, because caffeine increases the production of stomach acid, high usage over time can lead to peptic ulcers, erosive esophagitis, and gastroesophageal reflux disease.[80]

There are four caffeine-induced psychiatric disorders recognized by the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition: caffeine intoxication, caffeine-induced anxiety disorder, caffeine-induced sleep disorder, and caffeine-related disorder not otherwise specified (NOS).

Porque não esta esta informação na página dedicada ao café? Mistério...

Caffeine intoxication

Main symptoms of caffeine intoxication.[58]

An acute overdose of caffeine, usually in excess of about 300 milligrams, dependent on body weight and level of caffeine tolerance, can result in a state of central nervous system over-stimulation called caffeine intoxication (DSM-IV 305.90),[81] or colloquially the "caffeine jitters". The symptoms of caffeine intoxication are not unlike overdoses of other stimulants. It may include restlessness, nervousness, excitement, insomnia, flushing of the face, increased urination, gastrointestinal disturbance, muscle twitching, a rambling flow of thought and speech, irritability, irregular or rapid heart beat, and psychomotor agitation.[79] In cases of much larger overdoses, mania, depression, lapses in judgment, disorientation, disinhibition, delusions, hallucinations, and psychosis may occur, and rhabdomyolysis (breakdown of skeletal muscle tissue) can be provoked.[82][83]

In cases of extreme overdose, death can result. The median lethal dose (LD50) given orally, is 192 milligrams per kilogram in rats.[2] The LD50 of caffeine in humans is dependent on weight and individual sensitivity and estimated to be about 150 to 200 milligrams per kilogram of body mass, roughly 80 to 100 cups of coffee for an average adult taken within a limited time frame that is dependent on half-life. Though achieving lethal dose with caffeine would be exceptionally difficult with regular coffee, there have been reported deaths from overdosing on caffeine pills, with serious symptoms of overdose requiring hospitalization occurring from as little as 2 grams of caffeine. An exception to this would be taking a drug such as fluvoxamine which blocks the liver enzyme responsible for the metabolism of caffeine, thus increasing the central effects and blood concentrations of caffeine dramatically at 5-fold. It is not contraindicated, but highly advisable to minimize the intake of caffeinated beverages, as drinking one cup of coffee will have the same effect as drinking five under normal conditions.[84][85][86][87] Death typically occurs due to ventricular fibrillation brought about by effects of caffeine on the cardiovascular system.

Treatment of severe caffeine intoxication is generally supportive, providing treatment of the immediate symptoms, but if the patient has very high serum levels of caffeine then peritoneal dialysis, hemodialysis, or hemofiltration may be required.

Anxiety and sleep disorders

Two infrequently diagnosed caffeine-induced disorders that are recognized by the American Psychological Association (APA) are caffeine-induced sleep disorder and caffeine-induced anxiety disorder, which can result from long-term excessive caffeine intake.

In the case of caffeine-induced sleep disorder, an individual regularly ingests high doses of caffeine sufficient to induce a significant disturbance in his or her sleep, sufficiently severe to warrant clinical attention.[81]

In some individuals, the large amounts of caffeine can induce anxiety severe enough to necessitate clinical attention. This caffeine-induced anxiety disorder can take many forms, from generalized anxiety to panic attacks, obsessive-compulsive symptoms, or even phobic symptoms.[81] Because this condition can mimic organic mental disorders, such as panic disorder, generalized anxiety disorder, bipolar disorder, or even schizophrenia, a number of medical professionals believe caffeine-intoxicated people are routinely misdiagnosed and unnecessarily medicated when the treatment for caffeine-induced psychosis would simply be to stop further caffeine intake.[88] A study in the British Journal of Addiction concluded that caffeinism, although infrequently diagnosed, may afflict as many as one person in ten of the population.[77] Co administration of theanine was shown to greatly reduce this caffeine-induced anxiety.[89]

Surpresa... o café não é tão cor-de-rosa assim!

Vos deficio ego lucror.
Diogo Gonçalves
Grande Líder

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