You're missing the point. Those definitions you cite are only relevant to individuals or groups of people, not entire nation states. No one is claiming that imp

You're missing the point. Those definitions you cite are only relevant to individuals or groups of people, not entire nation states. No one is claiming that imports are "bad" or proposing to do away with all food imports, but countries should be able to produce enough staple foodstuffs to meet the basic caloric and nutritional needs of their population. Otherwise they continue to exist only on the sufferance of others. Do you really believe that the UK could never, ever be blockaded again? Has history come to an end? Besides the USA there are a number of countries which are at least mostly food secure including Canada, Russia, India, Brazil, France, Ukraine, Australia, and New Zealand. Some of those do depend on imports of fossil fuels and fertilizers to maintain production.