I’ve been on Soylent about 85% of the time for nearly two months, and i’d say it’s been pretty good. More steady energy, more cognitive focus, etc :D.
However, I noticed Rob’s recommendations listed no Vitamin D3 requirements. Upon investigation, although it makes sense based on his location and likelihood of sun exposure, as it is synthesised when you’re exposed to particular kinds of UV light, it might not depending on your occupation, location and exposure to sunlight (office workers, night owls and UK/Northern Hemisphere dwellers, this is mainly for you ^.^). It’s required for Calcium and Phosphorus absorption (http://www.medicalnewstoday.com/articles/161618.php) and appears to help in various other areas such as muscle function (an important note for the bodybuilders and exercise enthusiasts here - http://www.sciencedaily.com/releases/2013/03/130317221446.htm). Although it is contained in some foods, the quantities aren’t nearly enough to cover NDAs unless you eat a lot of specific foods, and it’s besides the point of Soylent in some ways.
Although different sources state a range of different amounts of sun exposure required to synthesise an adequate amount of D3, and as it also depends on what UV index you’re exposed to, some current research suggests, “approximately 5–30 minutes of sun exposure between 10 AM and 3 PM at least twice a week to the face, arms, legs, or back without sunscreen usually lead to sufficient vitamin D synthesis” (http://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/) although theres other research that suggests that the RDAs are low. Also, the rays that cause your body to generate D3 don’t penetrate glass, so you have to be outside and exposed in some way to light. The previously linked article goes on to say that complete cloud reduces UV effectiveness by 50%, and shade by 60%.
Although I happen to be someone who definitely needs some supplement as a night-dweller and student, I think people who live in areas such as the UK and/or who keep indoors most of the time should investigate oral supplements or a UV lamp for this. Although i’ve seen it in a few soylent mixes such as the Hacker DIY one, and I’m not sure whether posting this is a little pointless, but I wanted to bring it up just in case I guess XP.