However, excessive consumption of black coffee can cause many harmful effects on health.
Negative effects on sleep
Caffeine in black coffee can stay in the bloodstream for 6 to 8 hours, disrupting sleep if consumed late in the day.
According to the National Sleep Foundation (NSF), drinking more than four cups of coffee a day reduces sleep quality, causing insomnia or light sleep.
Chronic sleep loss can increase your risk of chronic diseases such as obesity, type 2 diabetes and heart disease.
Causes stress and anxiety
Caffeine stimulates the central nervous system, increasing levels of cortisol - the stress hormone. This leads to feelings of restlessness, nervousness and anxiety, especially in people who are sensitive to caffeine.
The American Psychiatric Association (APA) warns that consuming too much coffee can cause symptoms such as rapid heartbeat, hand tremors, and loss of concentration.
Increased risk of digestive diseases
Drinking a lot of black coffee stimulates the stomach to secrete more acid, increasing the risk of acid reflux and stomach ulcers.
According to the European Journal of Nutrition, people who consume more than four cups of coffee a day are more likely to experience problems such as stomach pain, bloating or indigestion.
Causes mineral imbalance
Black coffee has a diuretic effect, leading to dehydration and loss of important minerals such as calcium, magnesium and potassium through urine. This can cause problems with bone and muscle health.
A study by the American Journal of Clinical Nutrition shows that long-term caffeine consumption reduces bone density, increasing the risk of osteoporosis.
Effects on cardiovascular health
Drinking too much black coffee increases heart rate and blood pressure, especially in people with a history of heart disease.
According to research from the American Heart Association (AHA), consuming more than 400mg of caffeine per day (about 4 cups of coffee) can put stress on the cardiovascular system, increasing the risk of heart attack or stroke, especially in people with caffeine-sensitive genes.
Black coffee offers many health benefits when consumed in moderation (about 1-2 cups per day).
However, abuse of this drink can lead to serious consequences.
To take advantage of the benefits of coffee without experiencing side effects, you should control the amount of coffee consumed daily and pay attention to the time of drinking.
