The question for me is, if we were able to get what we need from food, would we ever get sick?

i think there is a big difference between having a nutrtious diet and being able to avoid illness completely. you might find that you have a stronger immune system if you're better nourished, so things like colds/flu won't kick in to the same degree kwim? we have been growing our own veg, and getting as much of our meat as possible direct from the local farmers (we have a lamb growing on a farm at the moment with our name on it, a pig too - and we're in the process of sourcing a beefer!), and in doing that, i've noticed that i haven't been as susceptible to colds/flu as i was a few years back. until recently, i hadn't had a serious bout of the flu in about 3 years - and i know i got sick more because of stress than anything... i work in a high exposure role when it comes to illness - 250 people in close working conditions - one person gets sick, everyone does, so it was very noticable to me when i didn't get sick at same time as everyone else...

also - fresh grown vegies just taste a thousand times better!