Understanding Hydration and Caffeine: What You Need to Know

You have more than likely heard how important it is to be hydrated. This can feel daunting some days, especially if you are not a fan of water. Sure, there are other beverages out there that you can choose from, but when you add flavor, generally, you are looking at a product containing added sugar or artificial sweeteners. Other options are beverages that contain caffeine. Like most of you, I have always been taught that caffeine is a diuretic (it makes you pee), and if you are drinking a diuretic, then how can you stay hydrated?

Caffeine and Hydration: The Complex Relationship

The role of a diuretic is to get rid of excess fluid by increasing urine production and output. As I stated earlier, caffeine is a diuretic, but how concerned should we be about our own fluid balance? For individuals who have heart or kidney disease, it is crucial to pay attention to how much fluid you are retaining versus releasing. Chronic conditions involving these organs directly impact the body’s ability to regulate fluid levels.

For people who don’t have chronic conditions, caffeine becomes an issue when large doses are consumed in a short duration by a person who has not consumed any or very little caffeine. Participating in this kind of consumption causes an acute diuretic effect. On the other hand, caffeine tolerance is a thing; therefore, if you consistently consume caffeinated beverages, there is a significant reduction in the diuretic effect. Something else to consider is the fluid content of the caffeinated beverage. This can also offset the diuretic effect and actually help maintain fluid balance. 

Coffee, Tea, and Beyond: Hydration Benefits of Caffeinated Drinks

For all my coffee drinkers out there, I have good news. Research suggests your hydration status is not compromised if you drink between 3-6 cups of coffee daily (along with water). In fact, you can count that fluid intake (since it is 98% water) from your coffee toward your daily fluid goal. Once you get in excess of your habitual intake amount, you start to see negative effects. Another bonus for coffee drinkers is the brain health benefits. Studies have shown that caffeine can stabilize the blood-brain barrier, reducing the onset of neurological diseases, such as Alzheimer’s, stroke, dementia, and Parkinson’s disease. 

Let us not forget to put our pinkies up with some teatime hydration. Tea is very much like coffee from a hydration standpoint. If you are a habitual drinker, then the 98% of water that is used to steep your tea will hydrate you. In general, coffee has a much higher caffeine content than tea, so there is not as much of a diuretic effect if you are a tea drinker. Also, most herbal teas are caffeine-free. Depending on the tea type, there are many holistic health benefits. The various varieties can be a welcomed addition to your home, from reducing inflammation and stress to relieving IBS, motion sickness, and nausea.

Now for the controversial topic of energy drinks (cue dramatic music). Can you get hydrated from energy drinks? The short answer is no. Unfortunately, with the high caffeine content per serving and the typical consumption being around exercise, the diuretic effect makes it very difficult to replace fluid losses. Results from different studies on energy drinks remain inconsistent. When looking at caffeine, sugar, and electrolyte content and comparing the short versus long-term effects, they can have vastly different impacts on people.

The one and only consistent variable that is evident in these drinks is not appropriate for children and adolescents. Though some studies on adult athletes do show performance benefits, there are just as many studies that refute them. With energy drinks having so many variables and the participants involved in the studies, it is challenging to get consistent data to make solid claims on the health benefits of drinking these little cans of overstimulation. 

Hydration Tips: Maximizing Fluid Intake with Caffeinated Beverages

Hydration and energy are both very important when the demands of adulting make you feel like you are choosing one or the other. This guide has, hopefully, offered some solace in the fact that your coffee or tea is not as detrimental as you once thought. The biggest takeaway is limiting or eliminating energy drinks from your beverage list. Obviously, water is going to be the best choice when it comes to hydration, but including other non-caffeinated beverages in your fluid selection can assist. 

Always exercise caution when drinking beverages containing sugar or sugar substitutes, as these can cause other health issues. Sports drinks, regular or sugar-free, can be beneficial when exercising or participating in other activities that cause excess fluid loss through sweat. 

Also, remember that everyone handles these beverages differently. Some individuals are more sensitive to the effects of caffeine, and some have different activity levels or live in different climates. Other factors, such as chronic disease, which impacts fluid balance, can change the focus on what beverages should be consumed. 

The Bottom Line: Hydration and Caffeinated Beverages

Remember that moderation is always the best way to go when it comes to caffeine. You can have too much of a good thing even if health benefits are tied to it. Be responsible when you are choosing caffeinated beverages. If you do choose to have an energy drink, make sure you are checking the caffeine content and stick with choices that have 100 mg or less. Drink plenty of water to offset the diuretic effect and fluid losses. Water is the key to hydration and should always be prioritized over all other beverages. If you have any comments, tips, or suggestions, please feel free to leave a comment below!

1. _{Air Force Materiel Command Nutritional Medicine Team. (2023, May 16). The low-down on Energy Drinks. Air Force Materiel Command. https://www.afmc.af.mil/News/Article-Display/Article/3396523/the-low-down-on-energy-drinks}
2. _{Alsunni A. A. (2015). Energy Drink Consumption: Beneficial and Adverse Health Effects. International journal of health sciences, 9(4), 468–474. https://pmc.ncbi.nlm.nih.gov/articles/PMC4682602}  
3. _{Killer, S. C., Blannin, A. K., & Jeukendrup, A. E. (2014). No evidence of dehydration with moderate daily coffee intake: a counterbalanced cross-over study in a free-living population. PloS one, 9(1), e84154. https://doi.org/10.1371/journal.pone.0084154} 
4. _{Maughan, R. J., & Griffin, J. (2003). Caffeine ingestion and fluid balance: a review. Journal of human nutrition and dietetics : the official journal of the British Dietetic Association, 16(6), 411–420. https://doi.org/10.1046/j.1365-277x.2003.00477.x} 
5. _{The Hidden Health Benefits of Tea. Pennmedicine.org. (2022, March 4). https://www.pennmedicine.org/updates/blogs/health-and-wellness/2019/december/health-benefits-of-tea} 
6. _{Wierzejska R. (2017). Can coffee consumption lower the risk of Alzheimer's disease and Parkinson's disease? A literature review. Archives of medical science : AMS, 13(3), 507–514. https://doi.org/10.5114/aoms.2016.63599}