Textured soy product (Soylent brown, Soylent Yellow) has been pretty much standard in state prisons for some time.
First they replaced green bologna, then beef, with turkey, and then replaced textured turkey product with Soylent.
What really sucks is that 5 of our farms raise cattle and swine to feedlot stage and then sell it for funds to buy Soylent.
And yes, a large component of the reason to go to Soylent was to be able to eliminate special Halal and Kosher dietary lines. Now those special diets are only needed for Ramadan/Passover and come from frozen meals.
stay safe.