In the video above, Dr Greger refers to two papers:

1. A Comprehensive Review of the Literature Supporting Recommendations From the Canadian Diabetes Association for the Use of a Plant-Based Diet for Management of Type 2 Diabetes by Sylvia Rinaldi et al, Canadian J Diabetes, Vol 40, Issue 5, pages 471-4277, October 2016 (full article: pdf file).
2. Awareness and Perception of Plant-Based Diets for the Treatment and Management of Type 2 Diabetes in a Community Education Clinic: A Pilot Study by Lee, McKay & Ardern, J Nutrition and Metabolism, Volume 2015, Article ID 236234, 6 pages.

Dr Greger's commentary is insightful. He explains why adoption of WFPB guidelines for diabetes has been slow despite Canadian Diabetes Association okaying it. Here are some reasons:

1. Public awareness is lacking (9 in 10 patients did not know that WFPB guidelines was a viable option). The paper by Rinaldi et al (2016) recommends that "Diabetes education centers in Canada improve patients' perception of WFPB by developing WFPB-focused education and support as well as individualized counseling sessions addressing barriers to change."
2. Doctors believe that patients are unlikely to adhere to WFPB even though studies (see paper by Lee, McKay & Ardern above) show that patients do continue the diet because they see positive changes.

For details, please see Dr Greger's video.