Often on the forums here people say they've found they can eat more calories of "whole foods" (typically meaning unprocessed foods or foods in their natural state) than of processed foods. I've never tracked carefully enough to say for sure, but it does seem when I'm eating lots of vegetables and salads, I can eat a whole lot and still see the scale move.
Anyway, here's a recent article that addresses the issue of "available calories." If you google
raw food available calories you'll find a lot more
http://www.iflscience.com/health-and-medicine/why-most-food-labels-are-wrong-about-calories
Anyway, if your diet contains a lot of processed foods (even foods considered healthful, like whole wheat bread or non-sugary cereals), you might try more veggies and see if it helps.
I know all about
the guy on the Twinkie diet who lost all that weight -- but it's worth noting he did not do an experiment where he ate the same amount of calories of whole foods -- perhaps he would have lost even more?
I should point out -- I'm not a raw foodie -- I love me some cooked food -- but it's just something to think about. Sometimes when I'm too lazy to cook a veggie side dish for dinner I just put out whatever raw veggies I can find in the fridge -- maybe I'll start doing that more and more!
Also, I suspect the same concept of calorie availability may apply to the amount things are processed -- like oatmeal -- maybe we'll discover that steel cut oats have fewer available calories than processed (quick cook) oats.