Does coffee dehydrate you?

Author: Willis Hermann  |  Last update: Monday, April 28, 2025

Overall, it's good news for coffee lovers: Experts say moderate coffee consumption won't dehydrate you in any meaningful way. Just don't consume more than five cups in one sitting, and pay attention to what your own body is telling you about how it reacts to caffeine and its diuretic and laxative effects.

Does coffee dehydrate you or hydrate you?

Coffee is a mild diuretic. But it probably won't make you dehydrated — especially if you're a regular coffee drinker and you limit yourself to less than 400 mg of caffeine per day. For most healthy adults, coffee is fine to enjoy regularly. And it can even contribute toward your total water intake for the day.

Can coffee count as water intake?

Here is one more reason to enjoy that morning cup of joe: “Coffee counts toward your daily water intake,” says Lauren DeWolf, MS, RD, a registered dietitian with Sharp Rees-Stealy Medical Centers. The water in coffee, tea and other caffeinated beverages helps us meet our daily fluid needs.

What happens if I only drink coffee and no water?

No. You wouldn't be as hydrated as if you drank just water, but the difference would be fairly marginal - a cup of coffee puts a lot more liquid into your body than its diuretic effect causes you to lose.

What drinks cause dehydration?

Avoid soda, alcohol and caffeinated drinks. One way to make sure you're properly hydrated is to check your pee. If it's clear, pale or straw-colored, it's OK. If it's darker than that, keep drinking.

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What's the worst thing to drink if you're dehydrated?

The most unhealthy drinks to keep you hydrated

Soft drinks or sodas have a high sugar or caffeine content, which can actually cause dehydration. It's also bad for oral health. Try to moderate your intake of soft drinks. Alcohol.

Why drink water before coffee?

Protects the teeth

Experts agree that when you drink water fifteen minutes before that first cup of coffee, it helps in producing a protective layer that reduces the chance of staining.

Is drinking coffee instead of water OK?

Do caffeinated drinks, such as coffee or energy drinks, hydrate you as well as water? Answer From Katherine Zeratsky, R.D., L.D. Water is the best liquid you can drink to stay hydrated. But caffeinated drinks can help meet your daily fluid needs.

What happens if you never drink plain water?

If you don't consume enough water, you may experience symptoms of dehydration such as headaches, dizziness, tiredness, low concentration, constipation and a dry mouth. Being severely dehydrated increases the risk of kidney stones and urinary tract infections.

What are signs of dehydration?

Check if you're dehydrated
  • feeling thirsty.
  • dark yellow, strong-smelling pee.
  • peeing less often than usual.
  • feeling dizzy or lightheaded.
  • feeling tired.
  • a dry mouth, lips and tongue.
  • sunken eyes.

What is the best drink to stay hydrated?

Water is a healthy and cheap choice to keep you hydrated, but other drinks can also count towards your fluid intake. We also get some fluids from the foods we eat. Not getting enough fluids can lead to dehydration.

Is a gallon of water a day too much?

Drinking a gallon of water a day is usually safe for most, but drinking too much water can be risky for those with certain health conditions like kidney disorders or heart problems, says Ellen Landes, RDN, CPT, a registered dietician based in St. Charles, Illinois, and owner of The Runner's Dietitian.

Does coffee deplete magnesium?

Other factors that can lower magnesium levels include: Drinking too much coffee, soda, or alcohol. Eating too much sodium (salt) Heavy menstrual periods.

Does coffee cause inflammation?

Caffeine is the first thing that comes to mind when you think about coffee. But coffee also contains antioxidants and other active substances that may reduce internal inflammation and protect against disease, say nutrition experts from Johns Hopkins University School of Medicine.

Which coffee is less dehydrating?

Decaf coffee poses no dehydration risk. While regular coffee has a mild diuretic effect due to caffeine, decaf's minimal caffeine content makes it practically a hydrating beverage, similar to water. Studies back this up, showing no significant difference in hydration between decaf coffee and water.

How can I check myself for dehydration?

You can quickly check for dehydration at home. Pinch the skin over the back of the hand, on the abdomen, or over the front of the chest under the collarbone. This will show skin turgor. Mild dehydration will cause the skin to be slightly slow in its return to normal.

Why should you wait 30 minutes to drink after eating?

Drink one glass of water 30 minutes before a meal to help digestion. Remember not to drink too soon before or after a meal as the water will dilute the digestive juices. Drink water an hour after the meal to allow the body to absorb the nutrients.

Is it OK to count coffee as water intake?

Coffee and tea also count in your tally. Many used to believe that they were dehydrating, but that myth has been debunked. The diuretic effect does not offset hydration.

Does coffee raise blood pressure?

Caffeine may cause a brief rise in your blood pressure, even if you don't have high blood pressure. This short-term spike in blood pressure happens mainly in people who don't drink caffeine often, rather than in those who do. Still, the blood pressure response to caffeine differs from person to person.

Does coke count as water intake?

Indeed, juices and sodas can count towards your daily water intake. However, keep in mind that they also contain high amounts of sugar and other ingredients, which can have negative effects on your body, such as raising blood sugar levels and causing other health issues.

Why shouldn't you drink coffee right after waking up?

By waiting for about 30 to 60 minutes, you allow your cortisol levels to naturally start decreasing. Drinking coffee too soon after waking up, when cortisol levels are already elevated, may reduce the desired stimulating effects of caffeine.

Why do Italians drink water after coffee?

The reason for this was that by drinking water, customers could free their palate of other aromas so as not to alter the taste of the coffee they were tasting. This way, you could better enjoy and appreciate the blend with all its typical aromatic notes.

What should you drink first thing in the morning?

First thing in the morning is one of the best times to hydrate. Your body has gone through a long fast. For a simple jump start, squirt half a lemon in your first glass of a.m. water for a bright boost of antioxidant phytonutrients, vitamin C, and potassium.

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