Long-time lurker, first time commenter. I've seen several people mention that there have not been meal replacement products like Soylent ever. The nutritional profile reminds me of EAS Myoplex + additional vitamins. Myoplex has been around since the mid 90s and was always marketed as a meal replacement. Learned about it from a bodybuilder website when trying to gain weight and easily "eat" extra meals. They have never marketed in the way Soylent has but it serves the same purpose. I took it to replace at least one meal a day for about two years. Blood work during that time period was normal and it worked well imo. Nothing against Soylent but the product is not a new concept.