This is the suggested diet I was given when I was in the hospital with my first flare. I had no idea about what to eat and how much diet played a roll in helping my UC. The hospital nutritionist gave me a few printed out pages of paper with a list of things to eat and things to avoid and explained that this is the best way to cut down on the 24 bowel movements I was having per day at that point. 24 was a lot, it meant no real sleep and lots of high scores on games on my phone while in the toilet. Here is an explanation of exactly what this diet will help do.
So this is not so much a commercially set up diet like FODMAP or SCD, there is no real book behind the movement and its not based on theories about what is best for UC. The low reside and low fiber diet is just a diet based on foods that create as little waste as possible by minimizing the insoluble fiber and other residue some foods create. Yes that is simplifying it, but really thats the basis behind it and really it was all I needed to know when I was told about it, it made sense.
The goal when in a flare is to try and give your colon a chance to heal, what better way to do that then to minimize the amount of work it has to do by passing indigestible waste. The example I will use is an extreme one, Corn. We have all seen and wondered why those kernels of corn we ate, came out just as they went in! This is a great example of a high residue food because we have trouble digesting that outer shell on the kernels!
This diet focuses on cutting out things like whole grains, seeds, nuts and stringy vegetables that strain our digestive system. There are other dietary restrictions people have that you may need to take into account when following this also, but the good part is, the list of foods is by no means complete.