A very comprehensive article on nutritional value of sweet potatoes which ADA seems to have recommended in limited quantity for diabetes due to its Anti-oxidants such as Vitamin A , Vitamin C, Fiber, A plant protein known to enhance Insulin sensitivity.
you can enhance its flavour by sprinkling some cinnamon, chilli powder, lemon juice, and black pepper...which also helps diabetes .
Please read the full article to have the full perspective on the subject.
Many people in the world are suffering from Diabetes. Here is an easy cure for diabetes. Lady finger a natural vegetable which can be used a
"REVERSE DIABETES NOW ! " ----- A BOOK REVIEW.
BOOK 'Bye T2D DEFEATING DIABETES ' written by G.Sreeprakash , published by PARTRIDGE ( a Penguin Random House Company ) 
Vitamin D connection to Diabetes, Heart disease and Dementia
How to control your Diabetes.