Im gonna go ahead and disagree. Consuming any calories breaks the fast. Depending on what the macros are, it may not raise insulin at all, but it will always break the autophagy which is a great part of fasting and the autophagy can cause a really nice euphoric sensation especially when you get past 18 hrs.
I have heard the only things that won’t really break it at all are water, salt, black coffee, tea, soda water, and apple cider vinegar.
Edit: OK I went back and looked for this video because I found it to be super helpful and it made everything so simple for me. https://youtu.be/5BXOkgwQTjk
What are you fasting for? If it’s for autophagy, any of that would break a fast. If you’re insulin resistant, the insulin spike would also defeat the purpose of the fast. It would probably be fine as a one time daily dose if you’re not insulin resistant and only fasting to lose a small amount of weight, but you’re not going to get the real benefits of fasting.
Dont use mct.
You literally want to add fat, so your body doesn’t need to touch your own.Even if its less than 50kcal.
Fasting means nothing goes down your throat.If you drink water, thats water fast. If you eat something like 50kcal, thats fasting mimicking.