

Interesting point!
In line with the uses of soy globally (Figure 3), the greatest driver underlying the production increase in South America is most likely the pig and poultry industry’s demand for soy cake, although it is given additional impetus by concurrent increases in the demand for soy oil by the food manufacturing and biofuel industries (see section 3).
https://www.tabledebates.org/building-blocks/soy-food-feed-and-land-use-change#SOYBB3
Most of the calories from soy go into the fodder. This is unlike other plants used for oils. I doubt so much soy would be used for oil if not for the profits from “byproducts”.
50% of the value for a “byproduct” is a lot, isn’t it?
I guess my main point is that we do not need to push the soy cake through guts of animals cramped in industrial farms, losing around 90% of the energy captured by soy and creating public health dangers. If used the soy directly as a food source, we wouldn’t need all the expansion. Even the soy cake can be used for totally healthy and tasty products, such as soy milk or meat alternatives. It would, anyway, reduce the stress on land use substantially. Simply because so much energy is lost in the whole feeding, caging, killing process of factory farming.
https://ourworldindata.org/grapher/energy-efficiency-of-meat-and-dairy-production https://ourworldindata.org/grapher/protein-efficiency-of-meat-and-dairy-production https://ourworldindata.org/land-use-diets