I see what you're saying, but I don't look at it that way. For example, it's the middle of the afternoon, and I'm ready for a snack. I want something healthy, so I stop by one of the market-type stands. I see the exact same boring stuff at every single one--diced melon, carrot and celery sticks, apple slices. Now I'm bored. I want to stick to my healthy lifestyle, but the only options are so dreadfully uninspired that I don't buy anything. So Disney says, "There's no demand for healthy food."
Conversely, let's say they're offering a small portion of fire-roasted veggies with a tahini dipping sauce. You're walking by and notice the attractively photographed dish on a sign and catch a whiff of something that smells delicious. You had no intention of seeking out something healthy...you were probably going to have some fries later...but here you are.
And to be completely fair, there are SOME options available like this, if you really seek them out. I'd just like to see more creativity and fewer carrot sticks.