Nutrition is my very serious hobby, I guess I shoulda put that in my hobbies list! I kind of obsess about it, and not being much of a meat eater (I'm a fish & vegetarian kind of girl) I've still read a lot about this. You should only worry if you have bad kidneys, but otherwise not really. Are you drinking enough water? That's crucial for anyone on a fairly high protein diet. Are you lifting weights? That'll be helpful to make most efficient use of it too. As long as you're not on the "all meat" diet, don't worry. Get some healthy whole grains and veggies in there and your colon and kidneys will cope with the lean meat just fine. Don't skimp on the water though or you'll get super constipated!

__________________
If you don't move, neither will the scale.
H=6'2"
CW=204
minigoal=198
goal=189 (we'll see how that feels when I get there)