If this term is new to you, start here. If it's old hat, watch the video anyway.
Dr. McDougall and Insulin-like Growth Factor 1 - YouTube
I started getting interested in IGF-1 when I read about its increased presence in milk from cows treated with bovine somatotropin (also known as recombinant bovine growth hormone, hormone injections that stimulate the cow to produce more milk, used by farmers to boost efficiency and profits).
I feel like I'm looking at the tip of the iceberg here. This is a big deal, and I agree with this doctor when he says, "In cancer research, insulin-like growth factor 1 is one of the hottest topics out there."
Insulin has been a buzzword for many years now, what with the rise in number of diabetes diagnoses... but is it possible IGF-1 is even more dangerous than its cousin?
EDIT: Please post your links to videos/articles discussing the topic. The Youtube lecture I posted is obviously geared at vegans, but it raises a few interesting points, the takeaway being say no to dairy and soy.