Feeding people was solved in the 20th century, perhaps almost too easily. See correlation between poverty and obesity in the 21st century, vs the 19th century.
We have plenty of food, but we've turned a large portion of it into unhealthy crap.
A lot of people use food for emotional pain management. Consuming food releases dopamine which is same as taking a drug hit.
My girlfriend used to be obese and I learned she felt very lonely and when we got into relationship - she got lot better and now she's very fit.
Do you have any links to papers about salt and fat counteracting satiation?
(This comment is not meant to argue for or against the position that food should be provided by the State. I'm just trying to understand what you mean.)