I'm a big guy. I'm 6' 8" tall and weigh about 253 pounds. According to the chart in PP for computing body fat percentage and lean body mass I have about 205 pounds of lean body mass. According to the Protein Power book, because of my activity level I'm supposed to eat 164 grams of protein a day to keep from losing muscle. That's a lot of protein! It seems hard to me to eat that much protein per day. I supplement my protein intake by using low carb, whey protein powder. The protein powder only has 2 grams net carbs per serving. It has Splenda in it. I'm considering not being as concerned about my minimum protein requirement and just eating until I feel full. However, I don't want to lose muscle mass. I'm doing some weight training and cardio and I don't want to be wasting my exercise time. Have any of you not met your minimum protein requirement and still not lost any muscle? Has anyone experimented to see how much protein they really need?