Bulletproof coffee, made with butter and MCT oil, doesn't break a fast because fat alone doesn't spike insulin or mTOR. A small amount in your coffee suppresses hunger and makes fasting easier without ending the metabolic state.
Does bulletproof coffee kill fasting? No, like people are so crazy about this. Look, if you have fat only during a fast, like you do in bulletproof coffee, well, let's see. You didn't raise mtor, you didn't raise insulin, so you maintained your fast. There's always people go, but mice only had water, so therefore you can have water. No, that's not how it works. So if you want to fast easily, just put a little butter, a little MCT in your coffee. And when you do that, you're not hungry and the fast is effortless and it won't break your fast.
