Caffeine is classified as a chemical compound with a pharmacological action rather than a nutrient. However, it is also considered a supplement or an active ingredient of dietary supplements. This ingredient can be found in multiple foods of daily use, such as coffee, green and black tea, guarana, cola and chocolate, and also in energy drinks and gels. Caffeine helps increase energy production, improves physical performance, enhances concentration, and it also promotes the 'burning' of stored fat.

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