How much protein can the human body absorb in one sitting?
I like to think I've got a good diet, considering. I'm not a nutritionist and my regime is built more of habit than discipline, but on the whole I've been following an informal "common sense diet" based primarily on the concept of "eat a lot of good stuff, and not a lot of bad stuff". It's served me well.
Now, my goal is pretty simple: I want to lose fat and gain muscle. To that end I've been eating a diet consisting mainly of organic cereal, skim milk, bananas, grilled chicken, rice, beans, and when I'm feeling decadent, fat-free turkey dogs. I also enjoy a protein shake after my workout and before bed. These shakes consist of three scoops of protein powder at 23 grams/scoop. With the four cups of milk my enormous Target-brand tupperware glasses hold, these shakes contain approximately 100 grams of protein.
I used to have two of these a day as a failsafe to ensure I was meeting my daily quota of protein, since my diet can get pretty erratic sometimes and I have a bad habit of skipping meals. Recently, though, a friend told me the human body can only take in 30 grams of protein in one sitting. He didn't clarify as to what constituted a "sitting", or what happened to the excess protein, only insisting that what I was doing was overkill.
My question for you, young masters of Bullshido, is this:
1) Am I taking in more protein than my body can handle?
2) What becomes of the excess protein?
3) Assuming I continue eating well and eating consistently, should I continue to supplement my diet with all this protein?
I weight 185 and lift 3-4 days a week. I also train BJJ 3-5 days.