Caffeine can affect mood and energy levels from "summary" of The Happiness Diet by Tyler G. Graham,Drew Ramsey, M.D.
Caffeine is a powerful drug that can have a significant impact on how we feel and function. When we consume caffeine, it travels quickly to the brain where it blocks the action of a neurotransmitter called adenosine. Adenosine is responsible for promoting relaxation and sleep, so when it is blocked by caffeine, we feel more alert and energetic. However, this initial burst of energy can quickly turn into a crash as the effects of caffeine wear off. This can leave us feeling irritable, anxious, and fatigued. Caffeine can also disrupt our sleep patterns, making it harder for us to get a good night's rest. This can further exacerbate feelings of irritability and fatigue, creating a vicious cycle of dependence on caffeine to stay awake and alert. ...
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