Love UncleDave's post. If a friend or family members says "Oh, you can't eat this" I usually respond, "Yes I can, but I'm choosing not to".
The one caveat I'd add on the banana issue...I've found that good carbs can trigger cravings for bad carbs. So I do better if I keep carbs low. But this is a tremendously individual thing--there are lots of people (particularly extra-active types) who seem to do better with higher fruit and starchy veg.
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food