Calorie, carbohydrate and fiber counts for peaches:
1 small (2" dia.) peach:
Calories - 31, Fiber - 1.2 grams, Carbohydrates - 7.5 grams
1 large (2-3/4") peach:
Calories - 61, Fiber - 2.4 grams, Carbohydrates - 15.0 grams
1 cup peach slices:
Calories - 69, Fiber - 2.5 grams, Carbohydrates - 16.2 grams
Another way to gauge the effect of peaches on blood sugar is the glycemic index. The glycemic index is a way of measuring how quickly a carbohydrate enters the bloodstream and how high it raises blood glucose levels.
The glycemic index is a scale from 1 to 100, with higher glycemic numbers indicating foods that raise blood sugar higher and faster than foods with lower glycemic numbers.
The glycemic index for peaches is 28 to 56 depending on the size of the fruit. This makes peaches a healthy choice for people with diabetes.
More information on carbohydrates and fruit...
Kaye Foster-Powell, Susanna HA Holt, and Janette C Brand-Miller (2002).International Table of Glycemic Index and Glycemic Load Values. American Journal of Clinical Nutrition. 76:5–56