Combining intermittent fasting with Bulletproof coffee has become a popular strategy for those looking to maximize fat loss, mental clarity, and sustained energy. But what makes this combination so effective, and how do you optimize the routine to get the most benefit?
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What Is Bulletproof Coffee and Why Do People Use It During Fasting?
Bulletproof coffee is a high-fat coffee drink made with brewed coffee, grass-fed butter, and MCT oil. It was popularized by Dave Asprey and designed to promote mental clarity, energy, and appetite suppression. Many people on intermittent fasting routines use Bulletproof coffee in the morning to curb hunger and maintain ketosis.
During a fast, your body shifts to using fat as its primary fuel. The fats in Bulletproof coffee—especially MCT oil—are rapidly converted into ketones, supporting energy and brain function while keeping insulin levels low.
Does Bulletproof Coffee Break a Fast?
This is one of the most debated questions in the fasting community. Technically, Bulletproof coffee contains calories and fat, so it does break a traditional water fast. However, because it doesn’t spike insulin and keeps your body in a fat-burning state, many consider it acceptable during intermittent fasting windows.
For more insights on fasting fundamentals, check out our Intermittent Fasting Beginner’s Guide.
Benefits of Combining Intermittent Fasting and Bulletproof Coffee
The combination of intermittent fasting and Bulletproof coffee offers multiple metabolic and cognitive advantages. Here are the key benefits:
Enhanced Fat Burning
The MCT oil in Bulletproof coffee increases ketone production, helping you stay in a state of ketosis. This enhances fat oxidation, especially when consumed during your fasting window. According to Healthline, MCTs may also increase metabolic rate and promote weight loss.
Improved Focus and Mental Clarity
Caffeine combined with ketones provides a stable, long-lasting energy source for the brain, avoiding the crashes of sugar-fueled mornings. This is why many entrepreneurs and high performers prefer this combo.
Appetite Control
One of the hardest parts of fasting is dealing with hunger. The fats in Bulletproof coffee are satiating, helping you delay your first meal without feeling starved.
Explore how fasting supports fat metabolism in our in-depth post: How Intermittent Fasting Boosts Fat Loss and Metabolism.
How to Make Bulletproof Coffee the Right Way
Making it the right way is key to reaping its benefits. Here’s how:
- 1–2 cups of high-quality black coffee (organic or low-toxin preferred)
- 1 tablespoon of grass-fed butter or ghee
- 1 tablespoon of MCT oil
Blend everything until frothy. Do not stir—it won’t mix properly.
When Should You Drink Bulletproof Coffee During Intermittent Fasting?
The ideal time is in the morning, shortly after waking up. If you're on a 16:8 fast, you might take it around 8–10 AM and break your fast with real food around noon. This keeps you in a fat-burning state longer while helping you stay focused and productive.
Best Intermittent Fasting Schedules for Bulletproof Coffee Users
Not all fasting windows work equally well for everyone. The 16:8 and 18:6 routines are most commonly used alongside Bulletproof coffee. These schedules give your body enough fasting time while still letting you enjoy meals later in the day.
Learn more about scheduling in our post: Benefits of the 18:6 Fasting Schedule.
Can You Add Collagen or Protein to Bulletproof Coffee?
Adding collagen is a great way to support your skin, joints, and muscles. However, adding protein may break your fast, depending on your goals. If you're fasting for autophagy, skip the protein. If you're focused on fat loss and mental performance, collagen may be acceptable.
We explore this further in: Intermittent Fasting and Collagen Absorption Timing.
Who Should Avoid Bulletproof Coffee During Fasting?
If you have digestive issues, high cholesterol, or are sensitive to caffeine, you may want to avoid this combo. Always consult with a healthcare provider if you're unsure.
Final Thoughts: Should You Combine Bulletproof Coffee with Fasting?
For many, Bulletproof coffee makes intermittent fasting more sustainable and effective. It’s not essential, but it’s a powerful tool to amplify results—especially for fat loss and focus. Test it for yourself and listen to how your body responds.
Frequently Asked Questions
Does Bulletproof coffee really help with weight loss?
Yes, it can help suppress appetite, keep you in ketosis, and increase fat burning—especially when paired with fasting.
Can I drink Bulletproof coffee every day?
Most people can safely drink it daily, but monitor your cholesterol and adjust fat sources if needed.
Is Bulletproof coffee safe during intermittent fasting?
While it breaks a strict fast, it's considered safe and beneficial for fat-burning goals by many fasting practitioners.
What’s the best fasting schedule to use with Bulletproof coffee?
16:8 and 18:6 are the most popular. Drink the coffee during the morning fasting window to prolong ketosis.