They don't.

Source: Parent of 6.

And kids are doing great with this virus, statistically speaking.

If your greatest worry is food supply, there is still food in even the most rampaged stores.

You just have to teach them food flexibility. You can do this by making the new foods look really fun, and by your own enthusiasm. Tell them every dish was one of your absolute favorites growing up. Make lots of yummy noises.

Their developing brains will permanently associate laughing/happiness even with the less appetizing foods.

This was demostrated with the kids who survived the great depression...they continued to eat dishes like cow tongue and chicken livers until death, because they came to love them as kids as an inprinted memory of family bonding.