Bulletproof coffee or butter coffee contains high-quality beans, unsalted butter, coconut oil, or any oil with medium-chain-triglyceride (MCT). It was invented to replace sugary and high-calorie breakfast meals and keep you satiated throughout the first few hours at your desk.
The Bulletproof Diet recommends adding ghee or grass-fed butter along with the coffee beans and MCT. That’s problematic because ghee has roughly 100-120 calories per tablespoon. Meaning, all those calories will end up breaking your fast.
The upside is that ghee is pure fat.
Why would that be considered a plus?
We have to look at how ketosis works. Normally your body uses glucose coming from carbohydrates as fuel. When there are not enough carbohydrates to burn for energy the body enters a stage called Ketosis. During Ketosis you start burning stored fat for energy. This means that consuming fats won’t interfere with ketosis a.k.a your body’s fat-burning stage.
In short, consuming bulletproof coffee will certainly break your fast. But you can drink it if you are practicing Keto diet and not following a strict fasting regime.