A) we do not have universal single payer food. Some welfare for the poor yes.
B) that's because food is a free market
B) that's because food is a free market
B) Let me rephrase. I'm not going to wake up one day to find that my required daily calorie intake has increased by multiple orders of magnitude. There are very few household budgets that could reasonably be expected to absorb such a shock, no matter how efficiently the market for those calories functions.
B) Again, yes, we need health insurance for rare surprises just like we get fire insurance, auto collision insurance, etc. in case of those rare occurrences. We do not need insurance for medical treatments that everyone gets. We just need to plan ahead financially for those, just like we do for food, clothing, housing, etc. Preparing ahead of time for known expenses is not insurance. If everyone's house burned down a few times each year fire insurance would not work, you would instead just factor that in to the cost of living.
As far as I can tell the main difference between the socialized food insurance we already have and the socialized medical insurance I'd like us to have is that subsistence level food costs are uniformly low for everyone whereas subsistence level medical costs vary wildly from person to person.