lsat time i flew... i had protein powder in my carry-on in sandwich bags...no problems
if they try to take anything from you, just tell them you are on a doctor prescribed diet due to a DISABILITY and you need these things during the flight. the second the word 'disability' comes out of your mouth, they have to watch what they do bc otherwise they can be sued for discrimination through the ADA. They are not allowed to ask you what disability you have.