Do different foods take longer for the stomach to digest?

I ate a peanut butter and jelly sandwich the other day and was full just about all day long. This got me thinking, are there certain foods that take longer for the stomach to break down?

Now, I Googled this and also briefly skimmed over the Digestion article in Wikipedia and didn’t see anything on this subject.

I also heard somewhere that foods that include all four food groups (such as pizza with meat on it) are the hardest to digest, any truth to this as well?

I’m not suggesting that this is an inappropriate question due to it being easily Googleable, but I thought I’d give you a Google tip:

If you type certain phrases in quotes, you’re more likely to get hits.

I typed - foods “longer to digest” - into Google and I got several hits on the first page.

Protein foods take longer to digest than starch and can lead to increased urine production.
http://www.avifresh.com/nutrisource/nh_athlete.html
Foods that are high in fat or protein take longer to digest than carbohydrate foods.
Avoid high fat proteins.
Peanut butter, red meat, and cheese, for example, take longer to digest and often add to feelings of fatigue.

Foods that are high in fat or protein take longer to digest than carbohydrate foods.
http://www.healthtouch.com/bin/EContent_HT/cnoteShowLfts.asp?fname=02051&title=PRE-COMPETITION+MEALS+FOR+ATHLETES+&cid=HTHLTH
Foods high in dietary fiber also fill up the stomach and take longer to digest, causing us to feel full sooner and for longer.
http://www.annecollins.com/food-portion-size-weight-management.htm

Another very useful tip is to click on “cached” for each hit and you will find your search words highlighted, so you don’t have to sift through large web pages to find the relevant bits.

I just tried taking your thread title and Googling it.

Sixth hit, first page:

http://www.soilandhealth.org/02/0201hyglibcat/020126shelton.orthotrophy/020126.ch19.htm

see I never ask direct questions in google, I just do keywords, which is why nothing turned up for me.

I know I’m not the OP but I would like to say thanks to you guys for showing me how to improve my Googling skills. (Hint, hint diggleblop.)

Wow, who would have though Guinea Hen stayed in your system the longest! I guess if I want to stay full all day I’ll have to have a guinea hen sandwich on nut bread…