Has she really traded food for those things though?
She's fat and gluttonous beyond belief, but even if she were skinny and would get her "foodieness" under control, I doubt she would have that happy family life with ample friends and full-time fulfilling job. She's mentally messed up and losing weight is not going to bring improvement in other areas of her life. First and foremost she's a bitch, so who would want to hire her or be her loving partner (except manlet Bibi and Beta-Peetz), even if she were "skinny"? Kids are out the window, her reproductive organs are fucked up. She has no interests or hobbies today, so why should that change as a dainty 120lb queen? She's not going to enjoy exercize or hiking all of a sudden, that's not her personality (or lack thereof).
It's easy to think her life would be better could she control her urge to eat because her deathfatiness is the most obvious manifestation of her fucked-upness, but in the end she'll just sit there lonely as ever, probably with another addiction to replace food, still job/friend/lover/childless. There's nothing to look forward to, except breathing easier.
And she doesn't complain about not having any of those things either. That's the irony of it and her arrogance. She claims Bibi is her loving boyfriend, she has plenty of friends, doesn't care for work or kids. Her haters are the problem for bringing those things up, her life is "perfect", except for her weight, according to her messed up mind. She thinks she'll be this happy go lucky person once she drops the pounds but I believe she'll be more unhappy than ever, because if she ever lost the weight she would have zero "goals" left and the bitter realization that she's still screwed up in the head and is as unpopolar as ever. It'll never happen so we'll never know though.