咖啡因存在于含咖啡因饮料中,可以缓解疲劳,让人精力充沛。

尽管可以生产出咖啡因,但某些植物也含有咖啡因这种成分。它被迅速吸收到大脑,并在服用数小时后通过尿液排出体外。在饮食中不需要咖啡因,但许多人食用含咖啡因的食品以缓解疲劳并提供能量。天然的咖啡因存在于茶叶,可乐果,咖啡和可可豆中。

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