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Is Coffee Keto? Facts, Benefits, and Tips

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  Published on August 1st, 2022
  Reading time: 3 minutes
  Last modified August 16th, 2023
Is coffee keto?

What can I drink on keto besides water? If you love coffee (like most people do), you might wonder if it’s allowed on a very low-carb diet. After all, coffee is a great energizer and can be used to help with weight loss. 

This article answers the question, “Is coffee keto-friendly?” 

We’ll look into its nutrition facts, common ingredients that increase the number of carbs in coffee, its health benefits, and how to make coffee keto-friendly. 

Is Coffee Keto?

One cup or 8 fl oz of plain brewed coffee has 0g carbs, 0.1g fat, 0.3g protein, and 2.4 calories, which makes it a keto-friendly beverage. [1] Brewed coffee also provides potassium, calcium, and magnesium in small amounts. 

Since coffee is completely carb-free, it fits perfectly into your keto diet and pairs well with eggs, cheese, berries, dark chocolate, and keto-friendly desserts

Unless you’re sensitive to caffeine, you can safely drink 4-5 cups per day (with a maximum intake of 400 mg of caffeine for women). [2]

However, keep in mind that whatever you add to your coffee can increase its number of carbs, which can mean the difference between maintaining or falling out of ketosis. Things that can quickly raise carbs in coffee include brown sugar, honey, low-fat milk, and flavoring syrups. Be sure to avoid these ingredients at coffee shops or better yet, brew your own coffee at home. 

If you don’t enjoy plain brewed coffee, you can use a natural sweetener like stevia or monk fruit that won’t raise your coffee’s carb count or affect your blood sugar. (Later in this article, we’ll show you three keto-friendly ways to enjoy coffee using different add-ins!) 

The Benefits of Coffee on Keto

As one of the best keto-friendly energy drinks out there, plain black coffee is helpful for: 

  • Supporting intermittent fasting. Plain coffee (without milk or other ingredients) won’t disrupt an intermittent fast and may even enhance its benefits, such as by reducing your risk of prediabetes and type 2 diabetes and increasing mental function. [3] [4]
  • Boosting athletic performance. If you’re an avid exerciser or train regularly, caffeine in coffee acts as a stimulant so that you’ll be able to push through your workout and not get easily fatigued. [5] Try this: Drink coffee 30 minutes to 1 hour before your next sweat session.
  • Increasing ketone levels. Here’s another interesting benefit of coffee, especially those who are new to keto—it may help you enter a deeper level of ketosis. A 2017 randomized controlled trial found that caffeine increased plasma beta-hydroxybutyrate (BHB), the most abundant ketone, in a dose-dependent manner. In other words, higher doses led to higher ketone levels. The same study also mentioned that adding medium-chain triglycerides (MCTs) to caffeine may prolong mild ketosis. [6]

3 Ways to Enjoy Keto-Friendly Coffee

Butter in coffee for keto diet

What can I put in my coffee for keto? Thankfully, there are plenty of low-carb and high-fat ingredients that will make your coffee taste better or healther. Try these ideas: 

  1. Coffee with grass-fed butter, MCT oil, or coconut oil. These are sources of healthy fats to add to black coffee that help boost your energy levels further while making you feel satiated (compared to plain coffee alone). Additionally, these fats contain micronutrients that benefit your body in many ways. For example, butter has vitamin A, E, and B12. 
  2. Coffee with your favorite keto-friendly collagen powder. Looking to support your collagen levels? If you prefer taking collagen in the morning, you can combine it with coffee. Nowadays, you’ll find lots of keto-friendly collagen peptides that taste like regular creamers. 
  3. Coffee with heavy whipping cream and ground cinnamon. Try this dessert-like combo by mixing 1 teaspoon of ground cinnamon (which has only 2g carbs) into black coffee and adding unsweetened whipped cream on top. 

Including Coffee in Your Keto Diet

All things considered, coffee is a keto-friendly drink that can help you with weight management, physical performance, increasing ketone levels, and enhancing an intermittent fast—on top of making you feel more alert. 

Coffee can only kick you out of ketosis when you use conventional sweeteners (like brown sugar, honey, syrups, and sweetened creamers) and milk (usually low-fat varieties). 

As an alternative, go for keto-friendly natural sweeteners and one serving of butter, collagen powder, or whipping cream for deliciousness if you’re bored of plain coffee.

Tiffany is a health writer and registered nurse who believes in low-carb nutrition, exercise, and living simply. She has carefully followed the ketogenic diet (mostly clean keto) since 2019, which helped her lose 44 pounds, heal PCOS, and gain more energy. She hopes to educate and inspire others through her content here at Ketogenic.com and on her personal blog Ketogenic Buddies.



Nutritionix. (n.d.). Retrieved August 1, 2022, from https://www.nutritionix.com/food/brewed-coffee 


9 reasons why (the right amount of) coffee is good for you. Johns Hopkins Medicine. (2021, October 28). Retrieved August 1, 2022, from https://www.hopkinsmedicine.org/health/wellness-and-prevention/9-reasons-why-the-right-amount-of-coffee-is-good-for-you 


Mirmiran, P., Carlström, M., Bahadoran, Z., & Azizi, F. (2018). Long-term effects of coffee and caffeine intake on the risk of pre-diabetes and type 2 diabetes: Findings from a population with low coffee consumption. Nutrition, metabolism, and cardiovascular diseases : NMCD, 28(12), 1261–1266. https://doi.org/10.1016/j.numecd.2018.09.001


McLellan, T. M., Caldwell, J. A., & Lieberman, H. R. (2016). A review of caffeine’s effects on cognitive, physical and occupational performance. Neuroscience & Biobehavioral Reviews, 71, 294–312. https://doi.org/10.1016/j.neubiorev.2016.09.001 


Smirmaul, B. P., de Moraes, A. C., Angius, L., & Marcora, S. M. (2017). Effects of caffeine on neuromuscular fatigue and performance during high-intensity cycling exercise in moderate hypoxia. European journal of applied physiology, 117(1), 27–38. https://doi.org/10.1007/s00421-016-3496-6


Vandenberghe, C., St-Pierre, V., Courchesne-Loyer, A., Hennebelle, M., Castellano, C. A., & Cunnane, S. C. (2017). Caffeine intake increases plasma ketones: an acute metabolic study in humans. Canadian journal of physiology and pharmacology, 95(4), 455–458. https://doi.org/10.1139/cjpp-2016-0338

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