Net carbs are the carbohydrates that can be digested and processed by the body as dietary carbohydrate. Therefore, they directly impact blood sugar. You can determine how many net carbs you are eating by subtracting the grams of fibre, glycerine, and sugar alcohols from the total grams of carbohydrate. Net carbs are the only carbs that you need to count when you are on low-carb diets, such as the Atkins diet.
It is important to understand why fibre does not count as a regular carbohydrate. Fibre substance does not break down into sugar, so it does not play a part in the overall sugar load of the carbohydrate. If a slice of bread has 27 total carbohydrate grams and 3 grams of fibre you have a net carbohydrate content of 24 grams (27 g 3 grams = 24 grams). This explains why some high fibre foods will have a more favourable impact on the blood sugar and insulin levels.
Only plant foods contain dietary fibre. Fibre has a number of effects on digestion, some beneficial, and some more harmful. One positive effect is that fibre is likely to decelerate the rate of digestion of food. This leads to a more gradual emptying of the food from the stomach into the small...