Cynicism masquerades as wisdom, but it is the furthest thing from it. Because cynics don't learn anything. Because cynicism is a self-imposed blindness: a rejection of the world because we are afraid it will hurt us or disappoint us. Cynics always say 'no.' But saying 'yes' begins things. Saying 'yes' is how things grow.
For diabetes in particular, we know there's a relationship between lack of glucose regulation and complications like blindness and kidney failure. So if you were diabetic and you knew that you could get your glucose in a tight, normal range just by adjusting your lifestyle, wouldn't that be great?