“What you could do to improve blood sugar response (regardless of the bread) is to add some protein and/or healthy fats to your slice of bread. For example, melting some cheese on top, spreading peanut or nut butter and topping with blueberries, or using it as your main sandwich bread will help your blood sugar. Protein and fats can help with preventing blood sugar spikes, which you can see with eating carbs alone,” Sauceda explains.