Soya veggie burgers and sausages generally use the same chemically extracted fraction of the bean. This meal is the product of the industrial crushing process the vast majority of the world’s soya beans go through. The raw beans are broken down to thin flakes, which are then percolated with a petroleum-based hexane solvent to extract the soya oil. The remains of the flakes are toasted and ground to a protein meal, most of which goes into animal feed. Soya flour is made in a similar way. The oil then goes through a process of cleaning, bleaching, degumming and deodorising to remove the solvent and the oil’s characteristic “off” smells and flavours. The lecithin that forms a heavy sludge in the oil during storage used to be regarded as a waste product, but now it has been turned into a valuable market in its own right as an emulsifier.
What does 2-3 million years of evolution know? This stuff's gotta be better than "artery-clogging-saturated-fats."