Here is a very interesting article I found about onions and the effects they have on both type 1 and type 2 diabetes. Go to: livestrong.com/article/4743...
It explains how many carbs. an onion has depending on the type and how you plan to use it. The ADA recommends that everyone has 5 fruits and vegetables a day-- adding an onion in would be okay since it's a low carbohydrate and calorie type of food.