Building Your Own High-Performance Athletic Body (2003, The McDougall Newsletter, Volume 2, Issue 9) has details on protein requirements for athletes. One of the sections in this article is titled "Athletes Eat More Food — Not Higher Protein Food".
Short Videos
(3 mins) Where do you get your Protein if you don't eat Meat?
(3 mins) How important is Protein in the Development of Muscles?
(6 mins) Where Do You Get Your Protein?
(7 mins, 2019) Protein Deficiency?
(2 mins, 2011) What about those High Protein / Low Carb diets that are so popular?
Lectures (Long Videos)
Two good lectures by Dr McDougall that explain how proteins continue to be misunderstood in scientific community today, how much protein we really need, which sources are best (plants vs animals), and consequences of excess protein intake.
(70 mins, 2021) Protein - Part 1
(90 mins, 2021) Protein - Part 2
Lecture by Nick Delgado
Nick Delgado became the director of the Pritikin Better Health Program, providing seminars alongside research scientist and the Pritikin Institute's founder, Nathan Pritikin. The lecture below was presented at Advanced Study Weekend by Dr McDougall.
(73 mins, 2017) Why Plant Protein is Misunderstood