I don't think there's a nutritional difference.<br><br>
It's just that steel-cut oats take a nuclear half-life to cook.<br><br>
And that ain't right.<br><br><img alt="angry4.gif" src="http://files.kickrunners.com/smilies/angry4.gif">
Yep the cut the instant ones a lot to make them faster to cook. I have these little pellet oats they called "groats" at the health food store. Those take an overnight soaking. I haven't really noticed a huge difference in flavor between those and the steel cut... it's all mush really!
For general nutrition questions I like to search<br><br><a href="http://www.nal.usda.gov/fnic/cgi-bin/nut_search.pl" target="_blank">here</a><br><br>
For <a href="http://www.quakeroatmeal.com/qo_ourProducts/quakerOats/product.cfm?productid=4" target="_blank">Quaker Steel Cut Oatmeal</a><br><br><a href="http://www.quakeroatmeal.com/qo_ourProducts/quakerOats/product.cfm?productid=3" target="_blank">Quaker Old Fashioned Oatmeal</a><br><br>
I didn't see a difference off hand. Instant oatmeal might be different, and certainly is if it is flavored. It looks like they do some fortification of the instant oatmeal from the quick look I took.
Steel Cut = 4g Fiber<br>
Old Fashioned = 4g Fiber<br>
Quick = 4g Fiber<br><b>Instant = 3g Fiber</b><br><br>
So, it's different in the case of instant, but not hugely different. But if you really want fiber for fewer calories, eat <a href="http://www.quakeroatmeal.com/qo_ourProducts/otherHotCereals/product.cfm?productid=38" target="_blank">oat bran cereal</a><br><br>
And I say "fewer calories" because I usually only eat a 1/4 cup dry, vs. the 1/2 cup dry listed as a serving size on the package. It's usually enough for me. YMMV.