http://www.livestrong.com/article/41094-protein-intake-muscle-growth/
Please note that too much protein intake can be metabolized into fat and cause a variety of health problems. Also note that your protein requirements can be derived entirely from real food. Supplements should be used with caution, labeling read thoroughly and probably leaning toward whey and casein as the source. As athletes, we will aim for about .3 - .5 gr of protein per lb of body weight.
A good rule of thumb: You will get 1 gram of protein for every serving of fruit and vegetables, 5 for every egg or handful of nuts you eat, 10 for every cup of milk or yogurt, 15 for every cup of beans or half-cup of cottage cheese, and 25 for every 3-4 ounce serving of meat.) ~ Mens Fitness
Bottom Line: Achieving greater muscle mass, and at the very least maintaining the muscle mass we have as we age is a healthy endeavor! We discussed today that 1% per year may be lost as we enter the ripe old age of just 30 years old! If this seems insignificant, note that by age 50, we may have lost 20% of our muscle mass. Besides not looking pretty, this is a hindrance to maintaining the strength needed in our lifestyles to continue functioning physically in the way we have been accustomed. Need a kicker here? With proper protein intake (not to say low carb! NEVER!) metabolism remains high and our fat burning capabilities will exceed our peers making us appear more youthful! Well, that's because metabolically...we are!
