I mean nhs standards class me as just in the obese section of bmi (and I'm a size 12), and I think majority of fat or bigger people are just bigger because they eat too much and don't exercise enough. obviously that will
duck with your metabolism. I get some people will have genetic issues and health conditions, but they should be in the minority of bigger people, not the majority. I don't have a genetic or health reason to be fat that I know of, I can just admit I eat more calories than my body needs, and don't exercise enough
and tbh from people I know with health conditions that
can lead to weight gain, they only fail at losing weight when they try to drastically restrict and try exercise loads from the get go, when they sensibly cut back to a small calories deficit and do simple exercise every day they then started to lose weight. I think some people do just find any excuse to justify being bigger when for majority of people it is they eat more than they need and don't exercise
anyway, it's very clear Carys doesn't have a health condition making her fatter/bigger than she used to be. She stopped working out. She ate more junk. it's simple.