My twopence worth as a Muslim ;
All Muslims have to fast except in certain conditions. Your sick , pregnant, travelling you don’t have to in fact for the latter two it’s forbidden. If your long term sick ie diabetic or of old age you don’t fast. In this scenario you pay a donation to feed the poor and impoverished. Everybody else who misses any fasts has to make them before the next Ramadan so basically you have a year to catch up. Muslims don’t just fast in Ramadan you can fast throughout the year these are known as optional fasts and are recommended for Mondays and Thursdays. Again these aren’t compulsory but highly recommended for health and wellbeing. So yes they were there well before 5/2 was ever heard of.
So the last Ramadan in 2015 was the longest I’ve known it since I was a child but the fact is you adapt and you learn. You learn how to manage your time and sleep. You learn that food isn’t the be all and end all. You learn which foods are good full of nutrients and you manage with less. If you have the time watch this video
https://youtu.be/9HP3g9tLAk4