My wife and I have tried feeding ourselves without anything from the store for extended periods and the first thing you notice is how addicted to sugar we all are. Maybe it isn’t a physical addiction but it certainly is a psychological one. Controlling what you eat and where it was grown doesn’t result in starvation but you have to convince yourself , or your addicted brain , that everything is OK and the sugar addiction is messing with your head. Very few people have pushed through their sugar addiction and probably don’t even know they have one. So there are things the system wants us to do , like eating lots of sugar, that are both unnecessary and unhealthy . We are collectively a mess and sugar, caffeine , alcohol, and tobacco are just symptoms. Fast on all of them for at least one month and see for yourselves.