Same reason modern prison food is primarily soy-based.

Nobody in positions of power want the peasant class to have a strong body or clear mind.

They want soft, obedient sheep, that do their bidding and don't ask questions.

It should surprise no one that they are demonizing nutrient-dense foods, and promoting malnutrition through 🌱🌱🌱🌎🌎🌎💚💚💚 marketing on vegan sludge.