I am not angry or upset. I just have a lot of years of experience living with a lot of overweight people. I also have spoken at length with medical professionals about the issue. (I work at a hospital.) There is no such thing as a food addiction. It is a medical impossibility. There are NO withdrawal symptoms from cutting down your intake of calories, other than being hungry....
This reminds me of the old saying, "Don't p*$$ down my back, and tell me it's raining."
I'm talking from first-hand experience. Your's is second-hand. I'm genuinely sorry for the problems you are having with your wife. But food addiction is very much real. I'm living proof of that! Nice to know that the doctors you have spoken with all agree that food addictions are not real.
(Hell, at one point in time, the U.S. government said there was no such thing as the Mafia. Ooops)!
No offense, but I'm going to go with my own personal experience, instead of a collective decision by a bunch of doctors who clearly have no clue what they're talking about.
As for symptoms, ever notice how cranky, or sometimes downright mean a Smoker becomes while trying to quit? Guess what, same thing happens with food. I have been, and seen other overweight individuals get angry as Hell, while dieting. Fat people being jolly? Not when it comes to dieting! Put Santa on a diet, and you'll end up with two evil individuals known for wearing red.
There's your symptom, and it's a big one!