I’d like to do an extended water fast, but hate telling my friends (cause we know how people can be). So I’m thinking I could eat only on the days they’ve invited me out to eat, which could be three days a week, to say a two-week gap. If while water-fasting, I took daily electrolyte and vitamin supplements, could I do that and avoid refeeding syndrome?
Electrolytes and vitamins do not prevent refeeding syndrome at all. If you’re fasting for longer than 7 days, you should do a proper gradual refeed with bone broth through to low carb food. Even if refeeding syndrome isn’t likely, the simple fact that it’s lethal should be enough of of a motivation to handle it correctly.
You want your insulin to rise slowly and in stages, not to spike.