QUOTE(imsohungry @ Jul 20 2007, 04:46 PM)

I was reading through previous posts, and several people said that they use xan. gum "when necessary."
My question is...what would I bake that doesn't need it? It's a binder, correct? I'm trying to improve my baking skills. I'm slowly improving with each attempt, but I need to fully understand everything because cooking is a science (and I majored in psychology...which is totally useless in the kitchen).
Blessings. -J
Xanthan performs the function of gluten - to hold things together. It's like a glue - few of the gluten-free flours have much of their own glue. BUT, some of the gluten free starches have some - like tapioca. It's a very sticky flour. It will hold together without xanthan. Sweet rice has a some of its own glueyness. Oats has some of its own glueyness (of course, only use gluten-free oats after you've had negative antibodies).
Eggs also add glueyness, though. So does gelatin. And cottage cheese (it's already got gum in it, quite frequently). And nut butters. And, sometimes, you don't want a lot of glueyness, you just want a little., like in a cake that you want to be very tender - to melt in your mouth.
That's why recipes say that. It just depends on what you are making and what it's got in it. General guidelines are:
1 tsp per cup for bread
1/4 to 1/2 tsp per cup for cakes, cookies, quick breads, pancakes, etc.