What foods are the main sources of carbohydrates?

Carbs have a direct relation to blood sugar readings. Check the nutrition facts panel or a carb counting book for the listing of carb content of specific foods. In general, all fruit, starchy vegetables (peas, corn, potato, beans), breads, cereals, grains, milk and yogurt -- all contain carbohydrate. The portion of carbohydrate depends on the serving size of the food you are consuming. One carb choice is typically considered 15 grams which is equivalent to 1 cup of milk, 1 medium sized piece of fruit, ½ cup canned fruit, ½ cup fruit juice, 3 ounces potato, 1 slice of bread, or 1/3 cup rice or pasta.