Those eating vegan had significantly lower IGF-1 levels and higher IGF-binding proteins than those just eating vegetarian, suggesting that the more plant-based one’s diet becomes, the lower one’s risk of fueling growth hormone-dependent cancer growth.
To review, I started out introducing Nathan Pritikin (Engineering a Cure), and the elegant series of experiments that became part of his legacy (Ex Vivo Cancer Proliferation Bioassay). They were able to demonstrate the means by which a plant-based diet and exercise could suppress the growth of breast and prostate cancer cells (see The Answer to the Pritikin Puzzle), and protect against prostate enlargement (see Prostate vs. a Plant-Based Diet). For more on BPH, see Some Prostates Are Larger than Others. I also asked, and answered Is It the Diet, the Exercise, or Both? We learned in IGF-1 as One-Stop Cancer Shop that the cancer-promoting growth hormone IGF-1 seemed to be The Answer to the Pritikin Puzzle—but why? What is it about plant-based diets that lower IGF-1 levels, and increase our body’s ability to neutralize IGF-1? Find out in Protein Intake and IGF-1 Production.