Food labels, whether you find them simple or complex, impart a tremendous amount of information. But for people with diabetes, labels don't tell the whole story. Yes, carbohydrate content is important, but there are still gaps in the knowledge a man with diabetes needs. Another part of the equation has to be found elsewhere.

Glycemic index (GI) is a number assigned to food indicating how quickly and how high those foods increase blood glucose. The values are 0 to 100, with 100 being given to pure sugar.

Why is it important to watch out for high-GI foods and regulate your blood sugar? Diet—namely carbohydrates and sugar—plays a huge role in controlling diabetes and keeping your body healthy and functioning normally, advised Lauren Ferrara, a Roseville, California–based registered dietitian and group fitness instructor at VFit Studio.

"Learning what foods, how much and when to eat them can greatly improve your blood sugar levels and prevent future complications," she said.