Rob and others working on soylent formulations may want to read this paper. Although it falls a little short of being totally conclusive, it was successful enough to bear close study. Also its diet ingredients list may at least provide a handy checklist for comparing our own DIY formulae, also perhaps indicating specific forms of various nutrients (i.e., chloride, gluconate etc.) that would be most useful.
It has occurred to me that ideally we should be aiming at a final soylent formulation that would be entirely free of food ingredients as such (oat powder and olive oil, for example). One of the most crucial aspects of soylent as an ongoing experiment in human nutrition is this question of a chemically-defined diet. From my own perspective as a CRON participant I can say that I’m quite aware of the extent to which nutrients are also physiological stressors – we inevitably “dig our own graves with our teeth” because so many foods also carry with them toxic elements. One of the potential advantages of soylent may be freedom from toxic components – if we can come up with a purely chemically-defined formula. For that reason the above experiment report should be of interest to us.