Dr McDougall's main food components are listed here: Starches and Fruits & Vegetables.

Dr McDougall has been advocating WFPB guidelines for over 3 decades now, much before Dr Barnard and Dr Greger rose to prominence. The best way to understand Dr McDougall's system is by browsing through a series of articles at McDougall Recovery Program (see the links on the right hand side, or keep clicking on 'NEXT') and McDougall Quick-Start Program (3 hour-long videos).