I've traveled with my own medically required foods since this 3 ounce thing/bagie etc started and have only had a 'discussion' one time on what I was carrying. I had a very small container of yoghurt that was in question for a few minutes, but I held on to it as I did have a letter from my doc.

The general attitude I get from the TSA people is 'well, if you need it, you need it'.

I would be in a world of hurt if I got stuck for hours on an airplane without my own food. I can't depend on the airline or anyone else to provide for me. I travel often, and often very far.