It's simple. Force everybody to eat the items and proportions being crammed down our kids' throats by the Wookie in Chief.
Not at all. It’s changing how you eat more than what you eat. Let me take the concept a bit deeper.
For many years, historians were puzzled with pre-industrialization references to “first sleep” and “second sleep”. Finally they figured out they were literal. That is, people had a very different schedule.
They would start the day with breakfast, often on farms before the sun came up. Then the big meal of the day was dinner, what today we call lunch. Then an hour or so after dusk, before bed, they would eat a lighter supper. Then they would sleep until around midnight.
Then they would get up, use the pot, stoke the fire, prepare breakfast and set it to cook, then go back to sleep.
This all changed with industrialization and illumination at night, to pretty much the schedule we follow today. (Which may explain a lot of sleep disorders, with the theory that people are not really designed to sleep the whole night through.)
In any event, by the earlier schedule, breakfast and supper were not very elaborate, but dinner was the feast of the day, with a morning’s work in front of it, and an afternoon’s work after.
So having the big meal at noon, not in the evening, may be a key to healthier eating. I say may, because there are so many variables.