The interesting part was that the runners didn't lose ANY muscle mass in their upper bodies, ALL the mass was lost in their legs — why? (scoobysworkshop.com)
Making sure you are eating adequate protein and exercising gently ensures that you don't lose muscle mass during pregnancy. (sondrarose.com)
Since meat and dairy eaters have the problem of losing muscle mass as they age I don't know how that info applies to you. (nutritionfacts.org)