I don't hate a t.v. character either (I don't like any of the Big Three), but, really isn't this "Kate's" whole story. She started getting fat as a kid and was unhappy, thinking she would never have a happy life or a husband. So she ate a box of Twinkies (whatever) and hates being fat. Then she meets a fat man who loves her and still isn't happy, so she eats another box of Twinkies and hates being fat. Toby matures and gets healthy and she still isn't happy and eats another box of Twinkies and hates being fat. So is it her dad's fault for dying, her mother being critical, Toby for evolving? She'll stay in LA, have a job she wants and eat another box of Twinkies because she is unhappy and hates being fat and on and on and on. She would not be happy even if she lost 100 lbs.
p.s. the actress has lost some weight, but they've had pad her now so we all know that Kate is still always unhappy and still eating a box of Twinkies and still hates being fat.