An Introduction to hte Whole Food, Plant-Based, SOS-Free Diet (2019) by Dr Alan Goldhamer and Toshiya Myers, PhD explains 5 food components and supplements.

Note that Dr Goldhamer is a big advocate of "WFPB-SOS" or "SOS-Free" where SOS means no-Sugar, no-Oil, no-Salt. In constrast, WFPB is no-Sugar, no-Oil, minimal-Salt.

Dr Goldhamer is the founder and director of TrueNorth Health Center in Santa Rosa, CA, since 1984.

(PDF) An Introduction to the Whole-Plant-Food, SOS-Free Diet by Dr Alan Goldhamer and Toshia Myers, Ph D, is a detailed description of dietary guidelines followed at TrueNorth Health Center.