Bulletproof Coffee & Fat-Fueled Mornings
Dave Asprey's famous butter coffee, presented honestly: a fat-rich morning coffee that blunts hunger and can make an eating-window approach easier, with clear notes on what it does and does not do.
Bulletproof Coffee is Dave Asprey's signature: coffee blended with grass-fed butter (or ghee) and C8 MCT oil. His pitch is that starting the day with fat and caffeine curbs hunger, steadies energy and makes time-restricted eating easier to sustain. The honest framing matters here. Butter coffee is roughly 400 calories, so drinking it does technically break a fast, you are not in a true fasted state. For some people it genuinely helps push the first solid meal later and reduces snacking; for others it is just calories they did not need. We present the useful core and flag the brand claims that go beyond the evidence.
Why it works▼
Blend coffee with fat
Blending emulsifies the fat so it is smooth rather than greasy.
Drink it to delay the first meal
The fat and caffeine blunt appetite, making a later first meal easier for some.
Be honest about the calories
Calling butter coffee 'fasting' is misleading; know which you are actually doing.
Keep it to the morning
Late caffeine harms sleep even if you fall asleep fine.
Don't treat it as 'free'
It only helps weight if it replaces calories, not adds to them.
- Coffee lovers exploring time-restricted eating
- People who get hungry mid-morning
- Anyone curious about butter coffee
- Those who want the honest version, not the hype
- Bulletproof coffee is roughly 400 calories and technically breaks a fast; 'fasting' with butter coffee is not a true fast, so be clear which you are doing and why
- Several broader Bulletproof claims (specific IQ boosts, that most coffee is dangerously mould-toxic, that butter coffee is metabolically unique) are not well supported by evidence
- Daily added saturated fat can raise LDL cholesterol in some people; if you have high cholesterol or heart disease, check with your doctor
- It only aids fat loss if it replaces calories rather than adding to them; mind your total intake
- We may earn a commission on products bought through this page
- Educational only, not medical or nutrition advice
- July 3, 2026 Protocol published.
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Not medical advice. This page is for education only and is not a substitute for professional medical care. Consult a qualified clinician before changing your health routine.
Independent curation. YourProtocol.ai is an independent platform. This protocol is based on the publicly available work of Dave Asprey and is not created, reviewed, endorsed by, or affiliated with Dave Asprey or 'Father of Biohacking' / Bulletproof.