Why does coffee affects peoples mood?

Caffeine in coffee acts on the central nervous system, blocking the effects of adenosine, a neurotransmitter that promotes relaxation and sleep. By counteracting adenosine's effects, caffeine stimulates the brain and nervous system, leading to increased alertness, energy, and focus. Additionally, caffeine triggers the release of dopamine, a neurotransmitter involved in feelings of pleasure, reward, and motivation. This cascade of neurochemical events can influence people's moods, making them feel more positive, energized, and ready to take on the day's challenges. However, individual sensitivity to caffeine and the context in which it's consumed can affect how coffee impacts a person's mood.