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Caffeine is a natural stimulant most commonly found in tea, coffee, and cacao plants. A cup of tea may have about 14 to 60 mg of caffeine in it while coffee has up to 200 mg.
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According to FDA, most adults can safely consume about 400 milligrams of caffeine a day.
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Caffeine may keep you awake even if you don't want it to as it decreases the levels of the hormone melatonin, which the body needs to fall asleep.
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Caffeine can make some people feel jittery or anxious, especially if you take in too much.
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Caffeine works by stimulating the brain and central nervous system, helping one stay alert and prevent the onset of tiredness.
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It blocks the effects adenosine, a chemical, which makes one sleepy making you more alert and energetic, which is why many people drink coffee or tea to stay awake.
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Coffee or caffeine can give heartburn as it increases the amount of acid your stomach produces. If you have reflux, caffeine can worsen the symptoms.
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Caffeine is also a diuretic, as it encourages the body to pass more urine.
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Too much caffeine can harm a developing baby, especially in the early stages of pregnancy.
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