Fact 1: In order to willingly consume their medicine, the youths need sugar coating.
Fact 2: Literal sugar coating is antithetical to this particular dose of medicine (a PSA about healthy snacks).
Fact 3: The youths will undoubtedly pay attention to all post-apocalyptic tales in which a singular bow-wielding female stands out among her peers.
Michelle Obama understands all aforementioned facts regarding teens, trickery, and take-home lessons explained through metaphor. And so, she made for the youths their own dystopian movie trailer, so they would at least have a fighting chance at concentrating.