Consequently to Industrial Revolution (18-19th century) first and Agricultural Revolution later (19-20th century), food started to be transformed, refined and packaged. Not only it determined a fundamental shift in the balance of the diet, but both crops and processed food were converted into commodities.
Saying that food became a commodity it means that it is simply considered something useful or else a good that can be exchanged and find a place on the market. The market value is the PRICE!
Too often price is the main (sometimes the only) parameter applied to choose which food will fill up our shopping trolley. The market is too often made up of people looking for quantity and not for quality.
As a normal commodity, even for food there is a separation between the producer and the consumer, a long distance between the field and the fork, during which food loses its identity.