Guaranine, theine

The guarana fruit's colour ranges from brown to red and contains black seeds which are partly covered by white arils. The colour contrast when the fruit has been split open has been likened to eyeballs; which has formed the basis of an origin myth among the Sateré-Mawé people.
Guarana extract reduced aggregation of rabbitplatelets by up to 37 percent below control values and decreased platelet thromboxane formation from arachidonic acid by 78 percent below control values.It is not known if such platelet action has any effect on the risk of heart attack or ischemic stroke.
Preliminary research has shown guarana may affect how quickly the body perceives itself to be full. 
Natural sources of caffeine contain widely varying mixtures of xanthine alkaloids other than caffeine, including the cardiac stimulants theophylline and theobromine and other substances such as polyphenols , which can form insoluble complexes with caffeine. Guarana from the Portuguese guaraná , Paullinia cupana, syn. P. crysan, P. sorbilis is a climbing plant in the maple family, Sapindaceae, native to the Amazon basin and especially common in Brazil.

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Fruit and Health

The body also naturally produces antioxidants, which fight free radicals and help prevent premature ageing and the onset of disease. These antioxidants neutralise the free radicals and stop them attacking our healthy cells. 
Fruit is also paced with dietary fibre, which helps to keep your digestion system running properly. Not only will this help expel waste products more efficiently, but it can also help prevent colon and bowel cancers as well, as there will be fewer toxins exposed to that area for less time.
Fruit is a great source of antioxidants. Eating them regularly will stop free radicals attacking and mutating our cells.
Because we are exposed to more and more free radicals every day, we need more antioxidants to neutralise them.

Below is a list of the health benefits of eating five portions of fruit or vegetables a day:
-Reduced risk of a stroke and other cardiovascular diseases
-Reduced risk of developing type 2 diabetes
-Reduced risk of developing certain cancers, including mouth, stomach and colon or bowel cancers
-Reduced risk of developing coronary heart disease
-Reduced risk of developing kidney stones and osteoporosis.

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