Is my 400 pound wife's refusal to exercise grounds for a divorce ?

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You have been together for forever, high school lover now husband and wife.You a quarter back/running back and she ,the head cheerleader.Back then she had stats to die for 26 ,15, 30 .She could walk into a room and all heads would turn .Men gave her longing stares and devouring eyes and it made you feel like a king knowing you have what they want and can never have. Now fifteen years later, three kids and mortgages up to your eyeballs, the marriage made in fantasyland has turned into your biggest nightmare and by big I mean 400 big ones thats her SIZE now.The stats you once relished have ballooned into a whopping 70 80 100 and growing .The stares of longing have turned into feelings of disgust and you can feel the venom rising to the back of your throat everytime she gets one when you are with her.The fight have become fierce and frequent. What I would like to know is if her refusal to exercise and change grounds for a divorce ?.Can you argue that this is not the person you married and hence I have been cheated in much the same way you can carry back the wrong item you got from a store ? Disclaimer : This is an hypothetical situation meant to generate discussion and it doesnt reflect the views of the writer lol