Not if you:
1) workout muscles
2) eat protein
3) do this for a limited time to quickly lose weight
Many athletes/bbers go on vlcd diets for a few weeks to quickly drop fat fast. There is zero need for body to go to muscles for glucose when there's ample supply of fatty deposits.
However if you do this for a lengthy period of time, never see the gym, have limited fat stores (why even do this then?) - then yes, body will start utilizing muscle protein for glucose.
Lots of great articles on this on lyle mcdonalds site and his "Rapid Fat Loss Handbook" where he specificaly answers this 'muscle loss' question.