GMO fruits and vegetables or even the cost of processing and extraction let alone shipping.

They don't take into account the nitrogen from petroleum fertilizers, or petroleum stabilized round up, pesticides and fungicides. They don't account for all the petroleum used to ship fruits and vegetables from around the world. They don't even account for the vast amounts of petroleum based energy and chemicals used to extract oil from canola seeds. You only get those amounts of oil (note it is biofuel oil which can be contaminated with all sorts of deadly poisons.) from canola If you use chemicals and petroleum based energy to extract every last drop. The normal, natural processes can't get that much ediable oil from an acre of canola.

Then of course your studies totally ignore the amount of vegtable matter it would take to replace the natural fats and proteins in meat. They just compare oz for oz but meat is filling while GMO wheat leaves you hungry 2 hours later.