Maybe, maybe not. Regardless of what the bottom line issues are w/ her and no matter how great & wonderful your M is besides your SL, if this is bothering you as much as you say, YOU HAVE GOT TO TELL HER / GET IT ACROSS TO HER AND MAKE SURE SHE KNOWS HOW VERY SERIOUS THE CONSEQUENCES MAY BE IF IT DOESN'T CHANGE.
You need to decide whether you will stay or not if things don't change. If your answer is no, then you need to make sure she knows the seriousness of it.
Make sure you don't now just start focusing on helping her to change things and *hope* that things will change. I'm telling you very seriously that she needs to know how you are feeling, how it is affecting you and how very serious it is. I would bet a lot of money she has no clue!!!! I know she would not be hurting you w/ the rejection, etc. on purpose, but if you don't get it across to her, things WILL NOT change whether she loses tons of weight or not. She is comfortable NOT HAVING SEX AT ALL. She needs more than losing weight to make her want to change things.
Me: 38 H: 35 S4, S5, S10 Bomb 01/07 Wanted D - nothing would change his mind Numerous A's prior to D bomb; EA prior/during D bomb Piecing 04/07 Deployed for a year 05/07 Still Piecing 2010 M 11 yrs 05/10