Do you eat small meals consistently throughout the day to get all of your necessary calories in or do you just eat very small meals at normal mealtimes?
I feel like a lot of the kids' meals are... well, crap, especially for adults. They seem to have a lot of the typical kid-friendly foods like cheeseburgers, chicken fingers and cheap (not the good home-made kind) mac and cheese. Plus they come with apple slices/apple sauce/carrots/a juice box or milk and you probably don't want or need any of that.
Any chance of you bringing a (collapsible?) lunch container in your bag/stored in a locker? You could get an adult-portion meal, eat some, and store the rest for a snack later. There are a lot of DL foods and treats that only really come in one size, like the soup in bread bowls (you can ask for the soup in a cup on the side instead of in the bread), monte cristo, pretzels, etc. I wouldn't want you to skip them because you can't eat them all at once.