You should be able to bring food on the plane. You can't bring it into the country. When I was still eating gluten, I had bought a sandwich in England, and had half of it still in my bag. A cute little dog sniffed it out, and my bag was searched. The woman saw it was just a sandwich of cooked meat, and didn't make a fuss. I was very embarrassed, but it was okay.
You can't bring fruit from overseas here, or from the U.S. to England. But, I always bring a couple of pieces for on the plane.
Hope this helps.
Kate
"It is only with the heart that one sees rightly; what is essential is invisible to the eye."
Antoine de Saint Exupery: The Little Prince
"To the world you may be one person, but to one person you may be the world."
Heather Cortez