Anyone have any knowledge on this subject?

1) Do we want IGF-1 to be high or low?
2) If so how do we lower it or raise it?
3) I read that a high carb diet lowers IGF-1 and i also read that it raises it?
4) Is the IGF-1 found in milk bad?
5) Also read conflicting evidence on the affect of higher protein diet on IGF-1 levels. Does it raise it or lower it.

I know its alot of questions, just hoping someone knows more on this subject then me.. thanx