To boost this! Yes consider donating a kidney folks! You only need one and it's a great way to instantly loose 3-5 pounds!
On an interesting note, the recipient does not usually get any kidneys removed before receiving one. Yup, that's right, I've met patients with five kidneys!
The thing is, if you get kidney disease, it affects both kidneys. You aren't more likely to get sick or die or anything bad from donating one.
The surgery is a big one and a painful one, but there are tens of thousands of people praying for a kidney every day, just waiting. And you only need one.