Originally Posted by Carbonfiberboy

Chris Carmichael says:

http://www.cbass.com/Carbs_Athletes.htm

Also see:
DOES DOING AEROBIC EXERCISE BURN MUSCLE?
http://www.livestrong.com/article/39...e-burn-muscle/

One loses protein if one does not replace what one burns. Simple as that. My long ride drink mix is 15% whey protein for that reason. I have protein in my breakfast before a ride and about 20% protein in my recovery drink and following recovery meal. My arm and thigh measurements change very little during the season, maybe 1/2" at the most.