We took 4 of our grandchildren to dinner, last night, at a local restaurant. Three of them ordered chicken fingers and one steak tips. The one who ordered the steak tips had a choice of 3 different kinds of potato and a variety of veggies. He chose 2 potato sides. If their meals had come with a vegetable they would have left it on the plate. On the other hand, I have 2 granddaughters in CA.who would rather have the veggies any day. They like what they like.
When my 3 YO grandson visits us (which is usually once a week), I've done a pretty good job of giving him what he likes. It could be pasta with bison meat in marinara sauce, salad with lots of tomatoes, (almost) homemade vegetable soup, or simple peanut butter sandwiches. He'll also help himself to popsicles, or other goodies in the freezer.
My 11 YO son loves beefaroni and spaghetti, Chick-fil-A, and Wendy's chili. As active as he is with sports and Boy Scouts, he doesn't gain much weight.
I like Subway, but I'm looking for another sub shop for the rare occasions when I'll eat a sandwich.