Does Caffeine Dehydrate You?

A primary reason why humans drink coffee is to get the caffeine they contain. Caffeine helps us to stay awake and works best if we’re already tired. However, caffeine can cause dehydration, so it might not hydrate you.

Caffeine and hydration

A key reason humans drink coffee is to get a daily dose of caffeine. Coffee contains caffeine, an addictive stimulant. Caffeine stimulates the central nervous system, increases alertness, raises blood pressure, and speeds up the heart rate. In addition, caffeine can increase concentration, improve memory, reduce stress, and promote weight loss. However, too much caffeine can cause headaches, sleepiness, irritability, and difficulty concentrating.

Though coffee is mainly used for its stimulant properties, recent studies suggest it may also help lower blood pressure. Coffee contains caffeine, an ingredient that stimulates the central nervous system, leading to increased heart rate and blood pressure.

However, drinking coffee regularly may reduce your risk of hypertension (high blood pressure), according to a report published in the American Journal of Hypertension. Drinking three cups of coffee daily was associated with a 25 percent decrease in systolic blood pressure (the top number) among people who drank one or more cups daily. People who drank four or more cups per day had the most significant reduction in blood pressure, at 29 percent.

Caffeine content in different types of coffee

Different types of coffee vary in how much caffeine they contain. Some coffees may cause dehydration, while others can help replenish lost fluids.

Brewed coffee

Brewed coffee is the most popular drink in the U.S., and it’s made by putting hot or boiling water over coffee grounds. It’ll take about 5 minutes for the brew to finish. A 12-ounce (360 ml) cup of Brewed coffee contains between 80 and 110 mg of caffeine, or approximately 95 mg on average.

Instant coffee

Instant coffee is made by brewing regular coffee beans that are freeze-dried or sprayed dry. It’s easy to make because all you need to do to drink it is combine one to two teaspoons of instant coffee with water. Instant coffee contains less caffeine than regular coffee; 30–90 milligrams per eight ounces (240 ml). Coffee can be prepared using various methods, including drip, pour-over, French press, stovetop, microwave, or espresso machine.


Espresso coffee is prepared by steeping finely ground coffee beans in hot water until they release their flavor and aroma. It is a lighter brew than coffee brewed with regular ground coffee, but it contains about the same amount of caffeine. A shot (1-1.75 ounces or 30-50 mL) Espresso can contain between 55 and 65 milligrams of caffeine.

Decaf coffee

Decaf is shorted for decaffeinated coffee; it’s made from beans with at least 97% of their caffeine taken out. Although the name suggests that it’s completely caffeine-free, one cup of decaf actually contains about 3 milligrams of caffeine, or roughly half the amount found in regular brewed coffee.

Should you drink coffee to maintain hydration status?

With that said, it’s important to note that caffeine can cause dehydration if consumed excessively. While drinking coffee may help keep your body hydrated, the amount of water needed to quench your thirst varies depending on the type of beverage, how much caffeine is present, and the water temperature. Therefore, consuming too little water can lead to dehydration. In addition, excessive amounts of caffeine can cause headaches, sleepiness, jitters, and anxiety.

So, while drinking coffee may temporarily relieve dehydration, drinking enough water throughout the day will make dehydration less likely and allow you to enjoy the benefits of coffee without experiencing any adverse side effects.

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