Just keep eating a decent amount of protein and it'll assist slightly in muscle retention. .7g/lb bodyweight is fine.
Come on 0.7g per lb is too little.
Studies have found, actually, that even in the more demanding physical environments (heavy, intense training), .7g protein/lb bodyweight is more than enough to build muscle.
The 1g/lb rule is more of a guideline to shoot for as a "just-in-case" measurement. Our bodies are actually much more efficient than most people give them credit for, and the protein that our muscles don't need with just be converted for purposes of dealing with the body's other functions (which isn't a bad thing, but more protein =/= more muscle).