Carbohydrates usually refer to carbohydrates and bananas are neither dietary fiber nor carbohydrates. Banana is a common fruit in life, while dietary fiber and carbohydrates are nutrients found in food. Therefore it can be said that bananas contain dietary fiber and carbohydrates, but not that they belong to dietary fiber or carbohydrates. In nutrition and food hygiene studies, carbohydrates are categorized as digestible and indigestible carbohydrates based on whether they are digestible or not. Indigestible carbohydrates mainly include dietary fiber and its monomer components, partially indigestible sugar alcohols, etc. Dietary fiber includes cellulose, lignin, resistant oligosaccharides, resistant starch, and other indigestible carbohydrates. In daily life, carbohydrates mainly come from grain and cereals, potatoes, etc. Dietary fiber is mainly found in vegetables, fruits, coarse grains and so on. Due to the changes in modern lifestyle and dietary habits, it is possible to moderate the intake of carbohydrates and consume more dietary fiber.