I supposedly have a severely redundant colon (just a nicer way to say it) and have had constipation for a good long time. Lately (I am 68), I have found that meat slows transit time, which leads to constipation, so I just eat fish (not much), egg whites, pea protein powder, and Lactaid nonfat milk as protein sources as I am intolerant to a legion of other protein sources (as well as FODMAP intolerant and grain intolerant). I add Bragg apple cider vinegar to each meal (the regular vinegar) or one can take the Bragg pill form. I find that helps with my redundant colon constipation. If you don't have enough stomach acid, your system can't prepare the food material to "move along." It has been a game changer. In addition, I don't eat regular-sized meals, but may six smaller ones, depending on my appetite. I also use mineral oil as my laxative. I find that, as a "mere" lubricant, it works better (and gentler) than the OTC softeners and stimulants. I take it at bedtime, away from food (supposed to do that as the oil can interfere with vitamin/mineral absorption from food otherwise). I don't need it often as the apple cider vinegar prevents constipation (via better digestion). I also notice that I tend toward constipation if I don't get adequate sleep. Rest to digest, perhaps. I hope you get some mileage out of these ideas, which I note one seldom, if ever, hears from MDs.