You didn't specifically mention it, but for a good medical reference for the realities of "living off the land", you might be interested in "Where There is No Doctor". I believe this was a 60s or 70s publication for Peace Corp workers working with people who were essentially forced to "live off the land". I think there is a dental version also ("Where There is No Dentist").

Anyway, as I said, the book deals with the realities of subsistence living: malnutrition (eat a variety of food), exposure (stay warm and dry), dysentery (wash your food with clean water), dehydration (drink lots of clean water), etc etc. A great deal of the book is specifically dedicated to maintaining health in children who cannot easily fend for themselves under these living conditions.