I was anorexically skinny in my teens, but gained a bit of weight (related to other life changes) and was comfortable in my 20s and 30s. My weight crept up on me in my 40s, and I was in a constant state of denial about it. No. I'm not fat. Who, me?
Then I decided to look in to a long-standing dream of mine and learn to fly. I got as far as the left seat of a 172 and couldn't get the seatbelt around me. Hell, I could only just barely close the door. I was crushed, but motivated. I did something about it...
I've lost a total of 160 pounds. Once again I'm skinny. Not as skinny as I was when I was 17, but nicely long and lean. I like it. No. I fucking love it. As part of my weight maintenance I weigh myself every Sunday morning. And I've beaten the odds: 90% of people who lose weight gain it back within a year. I'm coming up on two years. I hope to maintain my weight the rest of my life.
BTW: I passed my flight test last May. Flying is the most fun you can have with your clothes on.