Protein and fat can raise blood glucose to some extent, meaning their impact on breaking a fast is contextual.

“If it's mostly fat, probably not, a number of people out there nowadays talk about so-called fat fasting, fat fasting as a way to kind of regal past the stringency of either eating or not eating as a black and white rule for feeding window versus non feeding window. So some people will ingest medium chain triglycerides so-called MCTs, or people will ingest fats only until their official feeding window begins.”

“Now, of course, protein can raise blood glucose and fat can too as well, although to a lesser extent. So again, this is all contextual, but at least by the logic that I just spelled out, Athletic Greens, fish oil, and most forms of supplements, provided they don't have any sugar or protein content, should not quote unquote break a fast.”