I take loads of food to work.
I go to the gym on the way so I take breakfast with me - cereal with low fat yoghurt (I don't like milk on cereal).
For snacks a bag of satsumas. I get through about 4 a day, sometimes more, sometimes less.
For lunch a huge tub of fresh tomato soup. It's meant to serve 2, but as I don't have bread with it and it only has about 200 calories in the whole thing I eat the lot and it's really filling. I sometimes put some cooked chicken in it to add protein or bring a bit of bean salad if I made some the night before.
Also at lunchtime another low fat yoghurt and a huge punnet of berries, usually raspberries.
Then some more satsumas through the afternoon (usually 2 before lunch and 2 after, every hour and a half or so).
I always seem to be carrying tons of food though!
