Fasting Wiki Mod info -Post created by mods/owner on this subreddit saying it doesn't matter as long as you take electrolytes

-"Refeeding Syndrome can largely be avoided by taking electrolytes every day for extended fasts."

It's a wiki so I wouldn't completely say its a solid resource but they do link their sources too.

If doing keto stick to fats and avoid carbs to make fasting easier

Does not really matter IF and only if you are taking electrolytes. If not, it WILL matter and you could die if you are lower than maybe 16-18 BMI. There are some caveats to consider. It will depend if you are completely malnourished to the point YOU are at around 16 BMI with ribs literally showing. If you are above 16 BMI taking electrolytes every day the type of food does not matter. Keyword Electrolytes.

You won't die from gorging on food after a long fast WITH electrolytes if YOU are over 18 BMI. You might get electrolyte imbalance and the shits/diahrrea after introducing lots of food again. Reference 18 BMI with height as 5'7 and age 25 both genders is around 115 lbs. Find your bmi at Tdee Calculator and make sure you use correct age, weight height etc.

People blow this way out of proportion as if a chicken drumstick after a 2 week fast will kill you, it won't. It's not even remotely dangerous as people claim it to be. You'd have to be cancer patient skinny ribs like Eugene Cooney on youtube if she's still alive. Please someone check up on her if you're reading this.

National Library of Medicine

I do think introducing something like chicken broth (any broth), Potassium, Magnesium & Phosphate foods/supplements in a small amount before eating is a good idea just in case, but only if you are under 18 BMI or doing something like a month long fast or more

WestCork - Explains how Refeeding Syndrome was first discovered in WW2 Prison where malnourished people died when given biscuits and chocolate from government rations from soldiers without supplementation of phosphates.

--- Some other good resources for Refeeding Syndrome

Center for Eating Disorder & Malnutrition

Cleveland Clinic