"Fiber carbohydrates" refers to a type of nutrient that helps with digestion and keeps our bodies healthy. Fiber is a plant-based substance that is not absorbed by our bodies, but it is important because it helps to move waste through our digestive system and prevents constipation. Carbohydrates are a type of nutrient that provides energy to our bodies. So, when we talk about "fiber carbohydrates," we are referring to the carbs that are good for us because they are high in fiber and help our digestion.