Yes but according to Mark Sisson there’s a difference if you’re adding fat e.g. coconut oil or butter:
Technically, it breaks the fast. You’re ingesting calories (depending on how much fat you add, it could be a significant number of calories), and calories break the fast. But pure fat has little to no effect on insulin, blood glucose, or any of the other measurements that indicate a “broken fast.”
He also mentions that it shouldn’t affect autophagy.