I've recently started eating oatmeal (with bran and flax) every morning after my doctor recommended it (he scoffed at fiber additions like Benefiber instead of getting it unpurified through other dietary sources). It's been about a week, and I would say I definitely don't feel as hungry throughout the day, and feel like I have more energy overall (but maybe that's just daylight savings time). :)
It seems that the benefits of dietary fiber just keep piling up, including benefits to "bowel function, gut health, immunity, blood glucose control and serum lipid levels", as well as protection against colon cancer, and treating irritable bowel syndrome.
Now, I just need to find a tasty bran muffin recipe - looks like I'll be doing some baking soon!
For further reading:
Am J Clin Nutr. 2011 Sep;94(3):900-5. Epub 2011 Jul 20.
Nutr Clin Pract. 2011 Oct;26(5):625-35.
Mol Cell Biochem. 2011 Nov;357(1-2):235-45. Epub 2011 Jun 11.