13. Coffee Can Affect Sleep Even Hours Later
Caffeine has a relatively long half-life, meaning a substantial amount can remain in the body several hours after consumption.
A cup consumed in the late afternoon may therefore affect nighttime sleep in some people even if they do not consciously feel stimulated.
Poor sleep can then create a cycle: you wake tired, drink more caffeine, sleep poorly again, and depend on increasingly large amounts the next day.
If sleep is a problem, consider moving your final caffeinated
drink earlier in the day.
14. Coffee May Temporarily Raise Blood Pressure
Caffeine can cause a temporary increase in blood pressure, especially in people who do not consume it regularly.
Habitual coffee drinkers often develop partial tolerance to this effect.
If you have hypertension or notice a strong blood-pressure response after coffee, discuss your intake with a healthcare professional rather than assuming you must either completely avoid or freely consume caffeine.
15. It Can Trigger Palpitations in Some People
Many people can drink moderate amounts of coffee without experiencing rhythm
problems.
However, caffeine may trigger awareness of the heartbeat or palpitations in susceptible individuals.
Persistent, severe, or unexplained palpitations—especially those associated with fainting, chest pain, breathlessness, or dizziness—should be medically evaluated.
16. Coffee Can Irritate the Digestive System
Coffee stimulates activity in the digestive tract and can encourage bowel movements.
Some people find this helpful, particularly in the morning.
