I've seen several blood test results posted to the Soylent subreddit, and those generally are very positive. I know that's not a scientific study by any means,

I've seen several blood test results posted to the Soylent subreddit, and those generally are very positive. I know that's not a scientific study by any means, and people should be skeptical, but there really is a lot of (anecdotal) evidence out there of Soylent having a positive impact on people's diets. On the other hand, I've hardly seen any evidence of Soylent having a negative impact on someone's health.