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Best for: Everyone. This is the perfect starting point.
Popular Blogs
Does Coffee Break a Fast? The Science Behind Fasting and Coffee
With the amount of people who start their day with coffee, and the surging popularity of intermittent fasting, many are wondering: Does coffee break a fast?
Below I’ll cover whether coffee breaks a fast and other details related to coffee and intermittent fasting.
Table of Contents
Does Coffee Break a Fast?
Technically, any calories “break” a fast. However, the fasting state can be maintained when you consume very few calories.
While a zero-calorie fast maximizes results, an extremely low calorie fast still provides substantial results.
“So, can I drink coffee while fasting?”
Black coffee, yes. A cup of black coffee has less than five calories and no carbs or protein, so it practically does not affect fasting.
For all other types of coffee, the sections below provide additional information.
Coffee and Autophagy
Autophagy improves overall cell function (improves overall health). If the goal is to enhance autophagy, you should consume very few calories during fasting.
If you are focused on autophagy, your coffee should have less than:
25 calories
3 grams of carbs
1 gram of protein
Autophagy is delicate. The closer to pure black coffee you can get, the better.
Coffee and Ketosis
Ketosis improves fat loss (among other things).
If the goal is to maintain ketosis, you can consume some calories, provided they are mostly from high fat additions, such as cream, butter, or medium-chain triglycerides.
These additions will not take the body out of a ketogenic state, so you can add them to coffee without breaking ketosis.
If you are focused on ketosis, your coffee should have less than:
As you can see, ketosis is not as delicate as autophagy. Still, the less additional ingredients you consume, the more benefits you will experience.
Which Types of Coffees Break a Fast?
Coffees come in many different styles. Below is a list of the 21 most popular types of coffee and whether or not they break a fast:
Does Coffee Break a Fast Summary
Overall, does coffee break a fast depends on the reason for your fast (autophagy or ketosis), and the type of coffee you consume.
In general, fasting and coffee can coexist without breaking a fast. In fact, there may be synergistic effects when fasting and coffee are combined correctly.
To help create a proper pairing, remember that black coffee is best and if you have to add ingredients, limit calories, carbs, and protein.
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I've organized everything I offer around five core areas. You probably need help in more than one of these areas - most people do. The good news is if you improve in one area, you are likely to see improvements in other areas.
More Energy & Better Metabolism
You want to wake up ready to go, not drag through the day. This is about optimizing how your body processes food and fuel. Better metabolism means better energy, easier weight control, and stronger physical performance.
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Protecting your brain and maintaining your mental clarity as you age isn't something that happens by accident. It requires specific nutrition, sleep habits, movement, and lifestyle strategies specific to brain health. I'll show you exactly what works.
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I've organized everything I offer around five core areas. You probably need help in more than one of these areas - most people do. The good news is if you improve in one area, you are likely to see improvements in other areas.
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90-Day Optimal Wellness Accountability Program
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Best for: People who want structure, daily guidance, and quick results.
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Individual Looking to Improve Health?
Quick results & structure → 90-Day Program
Comprehensive system → Mastery Program
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Inspire your team → Keynote or Workshop
Strategic guidance & credibility → Advisory or Research
Not Sure?
to discuss what's best for you.
Recent Blogs
Does Coffee Break a Fast? The Science Behind Fasting and Coffee
With the amount of people who start their day with coffee, and the surging popularity of intermittent fasting, many are wondering: Does coffee break a fast?
Below I’ll cover whether coffee breaks a fast and other details related to coffee and intermittent fasting.
Table of Contents
Does Coffee Break a Fast?
Technically, any calories “break” a fast. However, the fasting state can be maintained when you consume very few calories.
While a zero-calorie fast maximizes results, an extremely low calorie fast still provides substantial results.
“So, can I drink coffee while fasting?”
Black coffee, yes. A cup of black coffee has less than five calories and no carbs or protein, so it practically does not affect fasting.
For all other types of coffee, the sections below provide additional information.
Coffee and Autophagy
Autophagy improves overall cell function (improves overall health). If the goal is to enhance autophagy, you should consume very few calories during fasting.
If you are focused on autophagy, your coffee should have less than:
25 calories
3 grams of carbs
1 gram of protein
Autophagy is delicate. The closer to pure black coffee you can get, the better.
Coffee and Ketosis
Ketosis improves fat loss (among other things).
If the goal is to maintain ketosis, you can consume some calories, provided they are mostly from high fat additions, such as cream, butter, or medium-chain triglycerides.
These additions will not take the body out of a ketogenic state, so you can add them to coffee without breaking ketosis.
If you are focused on ketosis, your coffee should have less than:
As you can see, ketosis is not as delicate as autophagy. Still, the less additional ingredients you consume, the more benefits you will experience.
Which Types of Coffees Break a Fast?
Coffees come in many different styles. Below is a list of the 21 most popular types of coffee and whether or not they break a fast:
Does Coffee Break a Fast Summary
Overall, does coffee break a fast depends on the reason for your fast (autophagy or ketosis), and the type of coffee you consume.
In general, fasting and coffee can coexist without breaking a fast. In fact, there may be synergistic effects when fasting and coffee are combined correctly.
To help create a proper pairing, remember that black coffee is best and if you have to add ingredients, limit calories, carbs, and protein.
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— Michael, 58
About
Stephen Anton PhD in Clinical and Health Psychology, University of Florida 25+ years researching longevity and healthy aging. Published in NEJM, JAMA, American Journal of Clinical Nutrition, and more. Recognized expert in intermittent fasting, metabolism, and cardiovascular health
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This information is for educational purposes only and is not a substitute for personalized medical advice. Please consult your physician before making changes to your health routine.