As for the thickening of the bowel, I have no idea, but it seems like the bowel movement speed and that are both side effects
And as for making it stick - here's my take. Animals don't become obese... Except when you feed them highly processed food. There's also a theory floating around that seed oils drive sugar cravings, and the fat they release does the same thing
So my advice would be this - use this opportunity to fix this. If you burn the old fat, get rid of your sugar cravings, and eat better food you might be able to fix your system in a way people mostly only do by moving to somewhere with better food culture for years
Avoid processed food and seed oils as much as possible. Take advantage of the time you have on it, and stack the deck in your favor while you can