Coffee's caffeine can make it hard to fall asleep or stay asleep.
Caffeine stimulates your central nervous system which can cause your heart to beat faster or harder.
Coffee acts as a diuretic, meaning it makes you urinate more frequently.
Caffeine triggers the release of cortisol, the stress hormone. This can heighten feelings of anxiousness and jitteriness.
Coffee stimulates gastric acid production which can cause stomach pain, constipation or diarrhea. It may aggravate ulcers or reflux.
Heavy coffee consumption may interfere with calcium absorption and lead to a higher risk of osteoporosis and bone fractures.
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