Can coffee dehydrate you? Here's what science says
Scientists finally have an answer about coffee and dehydration (photo: magnific)
Coffee has a mild diuretic effect, which is why it is often associated with fluid loss. But can your favorite drink actually dehydrate your body, and who should be especially careful? Eating Well explains what you need to know.
Diuretic effect of caffeine
Coffee is best known for its caffeine, the active ingredient that acts as a stimulant for the central nervous system. This compound is one of the main reasons many people drink coffee, especially as part of their morning routine.
Caffeine is a well-known diuretic, and its effects become more pronounced at higher doses. A diuretic is any substance that promotes the excretion of water and excess salt through urine.
Remember that caffeine does not provide the body with energy. As a stimulant, it simply helps you feel more alert or focused by binding to adenosine receptors in the brain, which are normally responsible for making you feel sleepy throughout the day.
Factors to consider
Everyone responds differently to coffee, whether it contains caffeine or not. Here are some additional factors to keep in mind.
How much coffee you drink. Excessive caffeine intake may negatively affect hydration. Consuming large amounts of caffeine—about 500 mg or more—can temporarily increase urine output.
This also applies to people who regularly consume not only coffee but also other caffeinated beverages, such as tea and energy drinks. Over time, the body develops a tolerance to caffeine, which reduces its diuretic effect.
Other dietary habits. Drinking water and other caffeine-free beverages regularly is essential for staying properly hydrated. In addition, many foods contribute to your overall fluid intake, including fruits, vegetables, soups and broths, smoothies, and milk.
How much coffee is too much?
Because coffee contains caffeine, it should not be consumed in excess. Healthy adults are advised to consume no more than 400 mg of caffeine per day. This is roughly equivalent to four cups of brewed coffee, although the caffeine content can vary.
The recommendation is lower for pregnant or breastfeeding women, as well as for people with chronic health conditions that make them more sensitive to caffeine.
How to tell if you're dehydrated
Everyone's fluid needs vary depending on factors such as age, chronic health conditions, and activity level. That's why it's important to pay attention to your body's signals.
Symptoms of dehydration vary, but they may include:
- Headache
- Dark-colored urine
- Rapid heart rate
- Thirst
- Dry skin and chapped lips
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This material is for informational purposes only and should not be used for medical diagnosis or self-treatment. Our goal is to provide readers with accurate information about symptoms, causes, and methods of detecting diseases. RBС-Ukraine is not responsible for any diagnoses that readers may make based on materials from the resource. We do not recommend self-treatment and advise consulting a doctor in case of any health concerns.
