-Net carbs are also referred to as digestible carbs. It means the number of carbohydrates that are absorbed by your body. Fiber isn't absorbed into the small intestine, so it has a neutral effect on blood sugar. -For keto, you only need to worry about the net carbs, not the total carbs. -Net carbs are calculated by taking the total grams of carbohydrates and subtracting the total grams of fiber, and sometimes sugar alcohol (you'll see this with low-carb baked goods). -For instance, half an avocado has 12g carbohydrates and 10g fiber. To calculate the net carbs: 12-10=2. So half of an avocado has 2g net carbs.