Is this true?

When people say they are fasting for 5 days, 12 days, 29 days!!, are they actually not eating for that whole time?? Have done many short fasts up to 24 hours but can’t even imagine going for several days (or weeks!!) via /r/intermittentfasting https://ift.tt/HJcdn72 https://ift.tt/1gODmou