that was a nice long thread to read. I agree with everyone here, I have empathy too. Just because someone may not be attracted to someone obese, doesn't mean it's shallow; it's just his/her preference.
I've been mostly thin/fit for my life, besides the last 9 years or so when I started gaining. Even at thin/fit and single, I was attracted to certain kinds of guys, some huskies, some muscular, some average, but I have never looked at anyone obese with disgust; they were just not my type. I was also very athletic and outgoing, so I gravitated towards those kind of guys too. I married a slightly slim man who was just 15lbs more than I at the time. He's still slim (God's blessed him with high metabolism) but gained a few pounds and is very happy about it. LOL. When he's pumping the iron...ooh baby! My kind. LOL
Okay, enough of my hubby....people will usually always gravitate towards others with the same interests in mind. And if there was a problem and it has been dealt with/fixed, then they shouldn't go down that path with others who are dealing with what was an issue for them. Unless they're called to be an advocate or something for others to get their lives back on track; much like someone who overcame drugs/alcohol and is now a counselor for others in that boat. But it takes a very dedicated, healed, and motivated individual to carry on and not fall back in to old habits too.
But back to dating; it's all based on character and personality attraction; physical is the bonus and there's no right or wrong attraction either. It's how you deal with it.