Part 2 Many “fasting gurus” will tell you that black coffee or pure green tea is allowed during your fasting window, as it doesn’t break your fast. This is 100% false. They base this theory on the fact that black coffee and green tea have no calories. And they’re not wrong. I’m not gonna get super technical here so I’ll keep it simple.

When your body consumes anything other than water, it shifts gears to metabolize (process) it in a way which breaks it from the “fasting mode.” This is the mode your body MUST remain in in order to achieve the maximum results from fasting. So despite having minimal calories, coffee (and anything else aside from water) does break your fast. This is where the word “breakfast” comes from. Once again, this is not my opinion. This is a proven, scientific fact.