Palpitations and anxiety
Anxiety and nervousness
Sleep disturbances
Long-term effects on the cardiovascular system and bones
Some people are more sensitive to caffeine, particularly pregnant women, children, and people taking heart medication or anti-anxiety drugs.
Some tips for drinking coffee safely
Choose filter coffee or hand-ground coffee, which is milder and less acidic.
Avoid drinking coffee too late in the day, especially after 4 p.m.
Stay hydrated: alternate a cup of coffee with a glass of water.
Limit sugar and flavored syrups: they mask the natural benefits of coffee.
Listen to your body: if you feel nervous or experience palpitations, reduce your coffee consumption.
Coffee is not the enemy you think: consumed in moderation, it can be a real ally for your health. However, excessive caffeine consumption can lead to nervous fatigue, anxiety and sleep problems.
How much? Three to four cups per day maximum, no more.
The secret, as always, is balance: drink coffee for pleasure and energy, not out of addiction 
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