let’s keep things simple and focus in on perhaps the least celebrated oat form of all: oat fiber.
So what is it exactly?
Oat fiber is an insoluble fiber made from grinding the oat hull, which is the shell that surrounds the oat groat (or kernel).
Whole oat groats come from harvesting oats, washing them, and removing their hulls. The groat is the source of most oat products we use. But unlike rolled oats, steel cut oats, and all those other celebrity oat siblings, oat fiber is actually made purely from the husk. Step aside, groat.
Now oat fiber doesn’t have a lot to offer in the way of nutrients, as it’s pretty much non-digestible. But that’s just fine because it isn’t consumed in order to load up on vitamins and minerals — leave that job to blueberries and kale.
https://maxinesheavenly.com/blogs/maxines-heavenly/what-is-oat-fiber