I've struggled with my weight my entire life.
I had periods of being thinner, and periods of not caring. Life was not only a yo-yo, it was a life of extremes. I was either eating in a super strict manner (and feeling miserable and like I was punishing myself) or I just said, “screw it' and ate whatever I wanted, indulging in whatever I felt like eating, WHENEVER I felt like eating it.
Throw cancer into the mix and it was very hard to want to “diet” when you're in pain, just trying to get through the day, limited in what you can physically do, or just plain scared.