I had this problem for almost a year. I simply didn't get hungry, and would really only eat when my sugar crashed. I've found that, with me, the less I exercise, the less hungry I am. If I work out, I have a normal appetite, but if not, then I just don't get hungry.
Try doing some small work outs and see if that helps? (Make sure you have the energy to do so and don't overdo it.)
Fandom Fest 2014 cosplay: GLaDOS (Portal), Ellie (The Last of Us), Lara Croft (Tomb Raider 2013)
MCM London Comic Expo cosplay: Oktavia von Seckendorff (Madoka Magica), Fem!Slenderman,
Future cosplay: Faith Connors (Mirror's Edge), Lara Croft (Rise of the Tomb Raider), Tetra (The Legend of Zelda: Wind Waker)
2015 conventions: Anime Los Angeles, Anime Central, Japan Expo