There’s a lot of background to this video.
Take 2 groups of laboratory rats exposed to a cancer causing agent. Then feed one group a low casein protein diet and the other a high casein protein diet. Casein is one of the main proteins in milk so it was an important protein to use. The results of this gruesome experiment? The low protein group was fine and the high protein group got cancer!
Is this series of experiments turning cancer on and off convincing for you? Will it change your diet?