I bring food with me for religious dietary reasons. I have packed: bottles of frozen milk and orange juice, boxes and bags of breakfast cereal, snacks (cookies, pastries, candy, fruit roll-ups), fruit (oranges, apples, bananas, carrots-ok, a vegetable), jars of peanut butter, bread, salami, etc. Haven't had a problem yet. I've also brought a peanutbutter sandwich on with my carry on, with no problem.