I occasionally fast from 4pm to 8am and have, several times, had painful, "stuck" gas in my lower GI tract. It's the kind that just sits there & is hard to move out. Anyone else get this? It's typically gone the next morning, certainly after breakfast and a good old bowel movement.
I'm interested in what might be causing this - like, does fasting cause the bowel to stop peristalsis?
Try sleeping on your left side, so that the weight of your organs press down on your intestines, and then in the morning do a few easy yoga postures such as the Child Pose, and The Wind Relieving Pose as seen here;
I get the same thing and my totally unscientific n=1 hypothesis is that it might be due bacteria "freaking out" and ramping up their activity (gas production) before they die off. I'm sure there's a thousand other possible explanations out there, this just what my lowly brain has been able to come up with as to why this happens.
wow. i know this is way old, but for anyone wondering the answer to this i'd like to give it a go. fasting=lack of food. do this long enough and your body may wind up in starvation mode. the body perceives this as famine (danger!) and slows down the metabolism. slow metabolism=slow moving...uh...well you know. slow poop! knock off the fasting OR eat WAY more during your meal times.