Can I Drink Bulletproof Coffee During Intermittent Fasting?

Written by Andrew Brewer. ⚕️Reviewed and fact checked by our medical team.

can i drink bulletproof coffee during intermittent fasting

Bulletproof coffee, also known as keto coffee, is packed with calories and fats, and you can’t drink it during intermittent fasting window. However, you can drink bulletproof coffee during your eating window to provide a feeling of satiety.

When you’re on a keto diet, drinking bulletproof coffee will keep you in a state of ketosis and won’t affect your weight loss plan. There’s evidence to suggest that it enhances intermittent fasting for weight loss when it is consumed outside of your fasting window.

If you’re struggling to maintain your fast, especially when you’re a beginner, having a cup of bulletproof coffee can help sustain you. Drinking bulletproof coffee has less of an effect on your fast than a lot of other options.

Key Takeaways

  • Drinking bulletproof coffee during the fasting window is not recommended as it contains calories and fats that can break the fast, but it can be consumed during the eating window to promote satiety.
  • Bulletproof coffee can help maintain ketosis during intermittent fasting, and the MCT oil in the coffee can be converted into ketones by the body, promoting weight loss.
  • While bulletproof coffee may not be suitable for a strict fast, it can provide numerous benefits, such as sustained energy levels and essential Omega-3 fatty acids and vitamins.
  • It’s essential to find a fasting plan that works for individual preferences, lifestyles, and health goals, and using a fasting app can help track and make better decisions about intermittent fasting going forward.

What is Bulletproof Coffee?

Bulletproof coffee is made using a cup of hot coffee, 1-2 tablespoons of MCT oil, and 1-2 tablespoons of ghee.

MCT oil is short for medium-chain triglycerides, and is made from coconut oil. It doesn’t have any flavor or odor.

Use either ghee or grass-fed unsalted butter for your bulletproof coffee. Blend the ghee and the MCT oil into the coffee until it is frothy.

Don’t overdo it with the ghee and the MCT oil when first starting. Let your digestive system adjust to these oils before introducing them in large quantities.

Bulletproof Coffee and Ketosis

Ketosis is the metabolic state your body enters when you stop eating readily available nutrients, like carbohydrates and sugars. People use the popular high-fat, low-carb keto diet to stay in a state of ketosis for extended periods.

During intermittent fasting, your body can go into ketosis after 12 hours but will stop once you break your fast. However, drinking bulletproof coffee won’t prevent ketosis, and can help with ketosis as your body converts the MCT oil into ketones.

Bulletproof Coffee and Autophagy

When you fast, you change the availability of nutrients at a cellular level. When cells don’t have readily available glucose, autophagy is triggered. Autophagy helps your body cleanse itself by breaking down dead and damaged cells.

People who use fasting to promote autophagy are more strict about following their intermittent fasting plans. Autophagy has numerous benefits, such as removing toxins from your body and promoting the regeneration of healthy cells, which can help you live longer and reduce your risk of diseases.

Research on the metabolic changes of autophagy shows that consuming fats impacts autophagy less than consuming carbohydrates, sugars, and proteins.

Benefits of Drinking Bulletproof Coffee

While it might not be acceptable for those on a strict fast, drinking bulletproof coffee has a lot of benefits for people who are using intermittent fasting to burn fat.

Bulletproof coffee helps you maintain energy levels without spiking your blood sugar. The fats in bulletproof coffee get broken down slowly by your body and can help you feel satiated for longer.

Drinking bulletproof coffee keeps you in the state of ketosis, which will help you lose weight, and it is packed with nutrients and essential Omega-3 fatty acids and vitamins.

Finding a Fasting Plan That Works For You

Everyone is different, and personal preferences, lifestyle differences, and health goals play a part in choosing the right fasting plan. What works for your friends or your trainer at the gym might not work for you, so be prepared to try various methods.

Many people find it easier to maintain their fasting plan when they use a fasting app because it helps them to track their daily eating and fasting windows. Fasting apps also prompt you to track how you’re feeling and can help you make better decisions about intermittent fasting going forward.


  • Can I drink Bulletproof Coffee during Intermittent Fasting?

Yes, you can drink Bulletproof Coffee during Intermittent Fasting, but it is not recommended during the fasting period as it breaks the fast.

  • Why does Bulletproof Coffee break the fast?

Bulletproof Coffee contains calories from butter or oil, which causes an increase in insulin levels and breaks the fast.

  • When is it okay to drink Bulletproof Coffee during Intermittent Fasting?

It is okay to drink Bulletproof Coffee during the eating window of Intermittent Fasting.

  • What are the benefits of Bulletproof Coffee?

Bulletproof Coffee may provide benefits such as increased energy, improved mental clarity, and reduced hunger cravings.

  • What are the benefits of Intermittent Fasting?

Intermittent Fasting may provide benefits such as weight loss, improved insulin sensitivity, and reduced inflammation.

  • Are there any risks to drinking Bulletproof Coffee?

Consuming too much Bulletproof Coffee may lead to an increase in cholesterol levels, and it may not be suitable for individuals with dairy or nut allergies.

  • Who should avoid drinking Bulletproof Coffee?

Individuals with dairy or nut allergies should avoid Bulletproof Coffee. It is also not recommended for those who are trying to reduce their calorie intake or are on a low-fat diet.

  • Who should avoid Intermittent Fasting?

Intermittent Fasting should be avoided by pregnant or breastfeeding women, individuals with a history of disordered eating, and those with certain medical conditions. It is recommended to consult a healthcare professional before starting Intermittent Fasting.

Andrew Brewer

Andrew Brewer

Andrew Brewer started to give people the guidance that he never received when he was first starting. His goal is to make your goals achievable and to offer you only the best fasting apps that the internet has to offer. You're not on your own - Andrew and the entire family of reviewers at are here with you every step of the way!