In the Zone you're eating the amount of protein you need to maintain your current muscle mass. If you're performing strength training and supporting your activity with the Zone recommended protein amount for your LBM and activity level you can gain muscle mass. Yu can use the calculator on this site to track your progress:
Lost 100 lbs 15 yrs ago, off BP meds, thanks to the Zone diet and Zone fish oil. ZoneFast 1-2-3 is the best!
Consultant of Zone Labs
Certified Zone Affiliate
View my Zone Fast 1-2-3 meal photos here: http://s531.photobucket.com/albums/dd352/SueK24/My%20ZoneFast%201-2-3%20Meals/
View my classic Zone meal photos here: http://s531.photobucket.com/albums/dd352/SueK24/?start=0