I was on weekly diabetes tests as nobody could get my sugar levels down, no matter how they cut my diet. The tablets they prescribed didn't work and we weren't getting anywhere, over about two years. In a chance conversation with the Dietician I mentioned if I had a third cup of tea with milk in it, I felt really ill. She picked up on this and this is when I was diagnosed as being Lactose Intolerant. Cut out the dairy and problem solved. Can now eat what I like, and I know exactly how much dairy I can have as well and no more sugar tests.