I got into that mindset when I had over 150lbs to lose (from anti-psych drugs) . . . it was very bad. [In the end I stopped taking the drugs and losing weight very easily, which I suppose is a different story.]

Prepare a meal for one, and have regular set meals - for yourself, because it makes you feel good! I'm sure you deserve it, even though I don't know you.

I dunno. I hate cooking and I'm not keen on food, but making sure I have regular and reasonably healthy meals makes me feel better physically and mentally. If you want advice/cookbooks I'm happy to help, or probably others have even more experience than me!