I don't think living alone would change your eating habits for too long. I saw this Oprah episode once where this woman would order a bunch of food through the drive thru and pull over to an empty lot or alley and eat it before she got home.

I live alone and buy as much junk food as I want. I can't say I get a chance to eat it. My dbf sits up in the middle of the night eating it up and complains about me buying it. Needless to say if it wasn't for ms he would have been dumped a long time ago. He takes me to some of my doctors appointments and helps me do things around the house that I can't do.