Interesting. I have a book called "Food Combining and Digestion." It says to eat fruit alone(haven't heard about the wait 3 hours thing, though). Also says to combine veggies and starch, and meat and veggies, but NEVER meat and starch. I've tried it, and it actually does make sense!
I ate a big plate of sauteed veggies once, over pasta and my tummy felt great after. Not sure if it was the food combining or not