> What about all of the foods in the grocery store than can kill you over years if eaten as a primary source of a diet? Are those considered "safe"

This is very disengenous. The makers of Soylent have come out and said Soylent is the only thing you need to eat to have a full and balanced diet.

I can't think of a single other food at a grocery store that has made a similar promise as I dont' believe any food can do this.