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William Read - Nutrition Consultant / Proofreader
William is from Canada, he is passionate nutrition & wellness writer. William understands that the topic of wellness is still not well understood, so his goal is to enlighten and teach people how to live healthier and happier in their bodies.

Can You Drink Coffee While Fasting?

Table Of Contents

Fasting is a strict way of life, generally done for religious reasons. It may be done for medical reasons, or as intermittent fasting for some hours as a habit. 

The point of interval fasting is that you consume all your calories in a short period of time – for example, between 12 and 6 p.m. – and then don’t eat anything for the rest of the day. And the health benefits of fasting range from reducing weight and blood pressure to increasing insulin sensitivity.

Coffee During Intermittent Fasting

Coffee is a popular beverage enjoyed by various people daily. It’s often consumed to get an energy boost and can be found in cafes, restaurants, and even at home.

Whether you’re fasting or not, we have known coffee as a good thing to drink while you’re awake. For example, it may help you stay alert during the day or boost your energy levels after lunchtime. But what about when you fast? Can we consume coffee while fasting? This post will provide an answer to that. 

Types of Intermittent Fasting

If you decide to practice this eating regimen, there are several types of intermittent fasting:

  • The 5:2 Diet: Five days a week you eat normally without any restrictions, and on two days of the week you limit your calorie intake to 500 or 600 calories per day. This diet recommends 500 calories for women and 600 calories for men.
  • Fasting 16/8: Following this method, you limit your food intake to an 8-hour interval each day and spend the remaining 16 hours of the day fasting.
  • Alternate Day Fast: This method requires fasting every other day. The first day you eat normally, and the next day you either completely starve for 24 hours or eat less than 500 calories. This pattern lasts for a week and can be more intense than recommended for beginners.
  • One meal a day: In this type of intermittent fasting, you eat only one meal a day, usually dinner. No calories are consumed the rest of the time.

Does Coffee Break a Fast or Intermittent Fasting?

The key factor in intermittent fasting is the number of calories. As long as the food or drink contains no calories, you will not break your fast. This means that black coffee goes great with intermittent fasting. Technically, a cup of coffee contains about 4 calories, because of the natural oils and amino acids in the coffee beans – but 4 calories isn’t enough to affect your hunger state.

A fast is a period of abstinence from all food and drink, typically for religious or health reasons. The word fast in this context can also be used metaphorically to mean abstaining from partaking in something (such as an activity or food).

Any food or drink that is not pure water breaks the fast. Coffee, tea, and other beverages are not considered pure water.

Coffee is a diuretic and can make you urinate more frequently. This can increase the number of times you go to the bathroom, which can lead to dehydration.

Coffee also contains a stimulant known as caffeine. Caffeine can increase your heart rate and also raise blood pressure. If you have high blood pressure or diabetes, it may be best to avoid coffee when fasting because it could make your condition worse.

Does Black Coffee Break a Fast?

During a fast, a black coffee drink with milk is a wonderful beverage to keep on hand. It is high in antioxidants, which boost energy and maintain healthy skin. It also includes several vitamins and minerals.

Caffeine in black coffee also aids in metabolism and the breakdown of fat cells for energy. This implies you fast for extended periods without having to eat. 

Does coffee break a fast

The Effect of Coffee on Intermittent Fasting

It turns out that drinking coffee can increase the benefits of interval fasting, helping you see health improvements faster.

How Coffee Intensifies Ketosis

Fasting is a quick and easy way to get into ketosis. When you don’t eat food, your body “eats” carbohydrate stores and then begins to burn fat as fuel. Thus, fasting goes well with the keto diet, helping your body get into ketosis faster.

And drinking coffee while fasting can make the keto diet more effective. Recent studies have shown that caffeine increases ketone production.

Can You Drink Coffee While Fasting?

The short answer is yes.

The long answer is that it depends on what type of coffee you are drinking, how much caffeine it has, and whether it contains other ingredients that may affect your fast.

Coffee beans contain a lot of caffeine, which can negatively impact your fast if taken too frequently or in large quantities (more than 1 cup per day). In general, most people should consume no more than 200 mg (or 8 oz) of caffeinated beverages per day during a fast state; however, if you need extra energy without affecting your diet plan or mood, then by all means add a cup of coffee to your morning routine.

Why Does Coffee Not Breakfast?

A cup of coffee has less than 5 calories and no fat, therefore, you can take it while fasting. 

Coffee has numerous health benefits, such as reducing the risk of certain cancers, improving brain function, and preventing heart disease.

However, caffeine can be toxic if you consume too much of it in one sitting. The kidneys work hard to get rid of this toxin, which can lead to dehydration and headaches in some people.

Does Coffee Boost Metabolism

Studies have shown that caffeine does increase metabolism slightly. In contrast, some studies have found that drinking coffee while fasting lowers your metabolic rate and makes it harder to lose weight! Why? Because caffeine can suppress the amount of fat-burning hormones like leptin, ghrelin, cortisol, and insulin — all of which are essential for losing weight.

However, coffee also contains a substance called chlorogenic acid, which can help reduce the amount of fat stored in the body. Chlorogenic acid also can increase glucose uptake by the muscles, which then helps enhance performance during physical activities. So there is no right or wrong answer to the question ‘does coffee boost metabolism’. It all depends on the factors at play. 


There are benefits and drawbacks to consuming coffee while fasting. However, it’s important to remember that there is no “right” or “wrong” when it comes to your personal health decisions. Think about your reasons for wanting to drink coffee while fasting, and decide what’s right for you after careful consideration of all the facts.

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William is from Canada, he is passionate nutrition & wellness writer. William understands that the topic of wellness is still not well understood, so his goal is to enlighten and teach people how to live healthier and happier in their bodies.