I was trying to find more info on what ramadan fasting actually is, here is a source from colorado university, it seems they eat one meal in the morning which isn't defined in caloric amount or anything like that, then one meal at sunset. This lasts for one month out of the year it seem they are only really going 12 hours or so without food, which is no more then what we do when we sleep, although i guess they are getting 2x the amount of time in between meals then the average person would get, and the calories are likely lower. I suppose that would count as caloric restriction/fasting, and its interesting that there was some research on its effects on IBD.
http://www.colostate.edu/orgs/MSA/events/Ramadan.html
FIY I practice caloric restriction ranging from 1600-1800 calories/day and sometimes going as low as 1200 but only that low for 1-2 days at a time. I probably require 2500 calories to be in the higher end of healthy weight. So I'm well below normal caloric intake, and im in the low range of the healthy weight for my body.
i started to consider the possibility of intermittent fasting being a better option where i would get all the calories i need, then take in much less on 1-2 days out of the week. For this new research what they are saying is that taking in no food at all for 2-4 days(prolonged Fasting) has more pronounced benefits then caloric restriction or intermittent fasting. ill probably try a total fast like this for 24 hours and see what happens. of course ill take in water though.