9g Carbs per slice. Only 40 calories per slice! 1/3 Fewer calories than regular white bread. No trans fat. Excellent source of Fiber. Bread is a low fat and cholesterol free food. Wonder Light is a great tasting, reduced calorie bread that has been specially baked for those who are counting the carbohydrates in their diet. Wonder Light Sourdough Bread has 6 grams of Net Carbs per slice. Because dietary fiber is not digested, dietary fiber carbohydrates can be deducted from total carbohydrates to arrive at Net Carbs. Wonder Light Sourdough has a total of 9 grams of carbohydrates but 3 of the grams are dietary fiber. Total Carbs: 9 grams - Dietary Fiber: 3 grams = Net Carbs: 6 grams per slice. Calorie Comparison: Wonder Light 2 Slices (45g) - 80; Regular White Bread (45g) - 120.