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Prior to WW2, all of our food was produced naturally and the longevity was 20 years less than now.. And, there were numerous crop failures and average yields per acre were much less than now. Realize that less than 2% of the present population in this country is directly employed in food production.

When all the food was produced 'naturally' more than 30% of the population worked on farms. Most people are fat, today, because they eat prepackaged foods, don't get enough exercise. If they work, their jobs are extremely sedentary. I could go on. In addition, prior to the proliferation factory canned foods, at least 50000 people died each year from salmonella poisoning due to home canned products not being sanitary.