When I was diagnosed back in 1984, I was told that sweets would always be a no-no. It wasn't until a few years ago when I started on MDI (Humalog/Lantus) that my CDE actually told me it was ok. I went from the age of 13 until my late 20's thinking I would never be allowed sweets unless I was hypo. I love that CDE for showing me the light. He actually laughed when he asked if I gave myself a treat for good results/birthday, etc. I told him "No, I was told those were never to be again". He got a good laugh about that and then set me straight on doing it within moderation.
