You love your coffee, and you’re curious about this mushroom coffee phenomenon. But you’re also no stranger to the occasional “coffee jitters” or that afternoon slump. Could dehydration be playing a role?
Staying hydrated is non-negotiable for feeling your best.
So, We’re exploring the potential dehydration pitfalls (and how to avoid them!) so you can enjoy your mushroom coffee guilt-free.
How Coffee Affects Hydration
Regular coffee contains caffeine, which has a mild diuretic effect. This means it encourages your body to produce more urine. The more you pee, the more fluids you lose. This is why some people believe coffee leads to dehydration.
However, studies show that moderate coffee consumption doesn’t significantly dehydrate you—especially if you drink enough water throughout the day.
Is Coffee Dehydrating or Not?
The truth is that coffee still contributes to your daily fluid intake. While it might make you go to the bathroom more often, it doesn’t cancel out the water content in your cup.
So unless you drink large amounts of highly caffeinated coffee without extra water, you’re probably not at risk of severe dehydration.

What Sets Mushroom Coffee Apart?
Mushroom coffee isn’t just regular coffee with a fancy name—it’s a whole new experience.
Here’s why:
1. Less Caffeine, Less Water Loss
Mushroom coffee has about half the caffeine of regular coffee. Since caffeine is the main reason for coffee’s diuretic effect, this means mushroom coffee is far less likely to make you lose fluids.
2. The Power of Medicinal Mushrooms
Instead of just coffee beans, mushroom coffee contains mushrooms like Reishi, Chaga, and Lion’s Mane. These mushrooms are packed with antioxidants and adaptogens, which help your body handle stress and maintain balance—including hydration.

3. A Gentler Energy Boost
Many people find that mushroom coffee gives them steady energy without the jitters or crashes of regular coffee. This means less strain on your body, which can help keep hydration levels stable.

What Science Says About Mushroom Coffee and Dehydration
We’ve dug into some scientific studies to uncover the truth about dehydration, caffeine, and mushrooms. And guess what? The results might surprise you.
Coffee (and Caffeine) Might Not Be as Dehydrating as You Think
One study by Sophie C. Killer, Andrew K. Blannin, and Asker E. Jeukendrup set out to test whether drinking coffee actually causes dehydration. The results? No significant difference in hydration levels between coffee drinkers and those who drank only water. That’s right—moderate coffee intake doesn’t dry you out like a raisin.
Now, since mushroom coffee has even less caffeine than regular coffee, the chances of it dehydrating you are even lower. If regular coffee isn’t the villain, then mushroom coffee definitely isn’t!

What About Mushrooms? Can They Cause Dehydration?
We also looked into research on mushroom toxicity and poisoning, and here’s the deal:
- The studies focused on toxic, wild mushrooms, which can cause severe health issues like kidney problems and organ damage.
- The mushrooms used in mushroom coffee (like Reishi, Chaga, and Lion’s Mane) are totally safe and have no known link to dehydration.
So, unless you’re foraging wild mushrooms from your backyard (please don’t!), there’s no reason to worry about dehydration from the ones in your coffee.
However, no specific scientific studies currently directly examine the effects of mushroom coffee on hydration. While the individual components (caffeine and mushrooms) have been studied separately, research on their combined effect is still lacking.
Practical Tips to Stay Hydrated While Drinking Mushroom Coffee
Enjoying mushroom coffee without worrying about dehydration is easy! Here are some simple ways to stay hydrated while sipping your favorite brew:

Drink Water Alongside Your Coffee
Start your day with a glass of water before your coffee. This helps balance out any fluid loss and keeps you feeling fresh. If you love drinking coffee throughout the day, just make sure to sip water in between cups.
Find the Best Time to Drink It
Drinking mushroom coffee in the morning or early afternoon is ideal. Your body naturally loses fluids overnight, so pairing your morning coffee with water helps you rehydrate. Avoid drinking it late at night—it won’t necessarily dehydrate you, but it might mess with your sleep.

Pair It with Hydrating Foods
Certain foods can help keep you hydrated. Add water-rich snacks like cucumbers, oranges, or watermelon to your daily routine. Even foods like oatmeal and yogurt contain fluids that support hydration.

Listen to Your Body
If you feel extra thirsty, dizzy, or tired after drinking mushroom coffee, your body might need more water. Every person is different, so adjust your hydration habits based on how you feel.
Additional Factors That Can Contribute to Dehydration
Mushroom coffee itself is unlikely to dehydrate you, but other factors might. Here are a few things that can affect your hydration levels:
Hot Weather & Physical Activity
If you sweat a lot—whether from a summer heatwave or an intense workout—you’re naturally losing more fluids. If you pair this with coffee (even mushroom coffee), you may need to drink extra water to stay balanced.

Medical Conditions
Health issues like diarrhea, vomiting, or kidney problems can increase fluid loss. If you’re dealing with any of these, drinking more water is essential, no matter what type of coffee you choose.
Certain Medications
Some medications, especially diuretics, increase urine production. If you’re taking these, be mindful of your hydration levels. Drinking enough water and choosing lower-caffeine beverages like mushroom coffee can help.
Brewing Methods and Their Impact
Did you know that how you brew your mushroom coffee can affect its caffeine content and hydration impact?

Here’s what you need to know:
Drip Coffee vs. Instant Mushroom Coffee
Instant mushroom coffee is pre-mixed with mushroom extracts and usually has lower caffeine levels. Drip brewing, on the other hand, allows you to control how strong your coffee is. A stronger brew means slightly more caffeine, which could have a mild diuretic effect.
Cold Brew vs. Hot Brew
Cold brew tends to be less acidic and smoother, making it gentler on the stomach. Some people find it less dehydrating than hot coffee because they naturally drink it slower, allowing the body to absorb fluids more efficiently.
Mixed Blends
Some mushroom coffee blends include added herbs, adaptogens, or even coconut milk powder. These extras can influence how your body processes the drink. If hydration is a concern, opt for simple blends without unnecessary additives.
Personal Sensitivity and Hydration Awareness
Everyone’s body reacts differently to caffeine, mushrooms, and hydration needs. Some people can drink multiple cups of coffee without feeling thirsty, while others might notice dry lips or mild headaches after just one cup.

Here’s how to understand your own body’s response to mushroom coffee and hydration:
Caffeine Sensitivity Varies
Even though mushroom coffee has less caffeine than regular coffee, it still affects people differently. If you’re sensitive to caffeine, even small amounts might make you pee more. If you notice this happening, try drinking extra water or switching to a lower-caffeine blend.
Signs Your Body Needs More Hydration
If you feel lightheaded, fatigued, or have dark-colored urine, your body might be telling you to drink more water. Pay attention to these signs, especially if you drink mushroom coffee daily.

Lifestyle Factors
If you exercise a lot, spend time in hot weather, or eat salty foods, you’ll need more fluids. Mushroom coffee won’t necessarily dehydrate you, but your overall lifestyle significantly influences how much water you should drink.
Bottom Line: No Need to Panic
Mushroom coffee is unlikely to cause dehydration. It has less caffeine than regular coffee and contains mushrooms that are entirely safe for hydration. As long as you drink enough water throughout the day, your mushroom coffee habit should be totally fine.