The food, it's people. Plays with the concept where humans or other sentient beings are processed into food or other products, likely to be sold back to their own kind.
The first video game about Soylent Green was released in 1997.
Soylent Green was a classic movie about the titular product that was found out by the protagonist to be actually something made out of humans. This tag borrows the name as there's no easy way to express the matter.