Is there any science behind the idea of too much protein (meat especially) being bad for us.

I'm seeing reports here that higher meat consumption is linked to cancer, especially colon cancer. (Though I tend to think cancer is linked to sugar consumption.)

Still, I guess meat is contaminated with all growth hormones and antibiotics and crap they feed the animals? COULD this cause can

I'm not buying it hook line and sinker, but just wondered why these ideas persist, and if there's any science behind the claims at all?