Mushroom coffee may break your fast depending on the type of fast you are doing and the ingredients in the mushroom coffee.
Some types of fasts allow for the consumption of certain non-caloric beverages or supplements, while others require complete abstention from food and drink.
If you are doing a water fast, for example, consuming mushroom coffee would likely break the fast as it is not water and may contain calories from the added ingredients.
On the other hand, if you are doing a dry fast (abstaining from both food and drink), consuming mushroom coffee would also break the fast as it is a form of liquid and may contain calories.
If you are doing a different type of fast that allows for the consumption of non-caloric beverages or supplements, you may be able to consume mushroom coffee without breaking the fast, depending on the ingredients.
Some mushroom coffee products may contain other ingredients such as milk, sugar, or creamer, which could add calories and break a fast that only allows for the consumption of pure water.
It is important to carefully read the rules of your fast and understand the ingredients in any beverages or supplements you are considering consuming before making a decision.
If you are unsure whether mushroom coffee would be allowed during your fast, it is always best to consult with a healthcare professional or the person who recommended the fast to you.