I take protein powder twice a day (2x one scoop). my doc. said it's not a good idea as protein powders are not controlled by fda. what do you think?

I agree : With your doctor. It's a poorly regulated industry. A popular brand here was contaminated with heavy metals.

Why protein powder?: Diet supplements like the protein powder are expensive and, unless you are a very competitive athlete doing extreme training they mostly get flushed down the toilet when you pee. Trying to build muscle? Increase the lean meat in your diet and hit the weight room. If you're going to eat that much protein drink lots of water to help the kidneys flush the by products.