As a long term, type 2'er, the advise on white foods is very correct.
When invited to someones home, knowing of my problem, some will go out and purchase "no sugar added" products. Incorrectly they think that sugar is the problem for us.
If they ask, I try to make it easy for them. I just tell them, make what you want, I will just avoid anything white. Works well for them, and me.
By the way, the line about going blind, or losing toes, for a slice of cake, is very true, and something I will remember, next time that old carrot cake calls to me.