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Caffeine
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a substance present in coffee or tea that makes one's brain more active
What is "caffeine"?
Caffeine is a natural stimulant found in various beverages and foods, such as coffee, tea, energy drinks, and chocolate. It works by blocking the action of adenosine, a neurotransmitter that promotes relaxation and sleepiness. By doing so, caffeine increases alertness and reduces fatigue. Caffeine also stimulates the release of adrenaline, which can temporarily increase heart rate and blood pressure. Moderate consumption of caffeine is generally considered safe for most people and may even have some health benefits, such as improved mental alertness and enhanced exercise performance. However, excessive intake can lead to side effects like jitteriness, insomnia, headaches, and increased heart rate.
例
Too much caffeine can sometimes cause a headache.
The pharmacological effects of caffeine can vary depending on individual sensitivity.
An immoderate amount of caffeine can lead to restlessness and anxiety.
Energy drinks often contain caffeine and other stimulants to provide a quick energy boost.
She relies heavily on caffeine to stay awake during long shifts.
