Sin, disease... What's wrong with a plain old fact? Are you overweight? Then you're overweight. Are you downright fat ? Then you're fat. Religious dogma aside (as I don't care about it), I'm going to say you're not committing a sin or evil act by being heavy. Barring the adenovirus hypothesis panning out or your having a known glandular issue, I'm going to guess that you don't have a disease. You just have a fact . A…
I have known people who've struggled with mood and focus. Knowing if it's caused by a disease (depression), circumstance (losing a loved one), or intentional behavior (playing video games when they should've been sleeping), helps determine what sort of treatment is likely to be effective. Medicating a person for a character flaw is just as dangerous as castigating them for a disease.