it's a real meal replacement product named after the movie, it was a big trend in the tech crowd like 10 years ago. it's supposed to be a blend of all the nutrients you need in drink/powder form, people would try living off of it.
I'm in the same boat as you. I researched it a bit. Yes, Soylent Green is a movie. It is a meal replacement product made up of human remains. The movie takes place in 2022. The real Soylent is not human remains (or is it? 🤣).
Absolutely loved that novel (novella?). The descriptive language really captures a lot of the theme, from the shipyard chained together into a shanty town to the description of Sols oven being modified to different energy sources as societies resources dwindled
Would absolutely recommend it, especially if you enjoyed soylent green