What is more commonly known as dietary fibre and is a form of complex carbohydrate not digested in the small intestine?

Dietary fiber, often referred to as non-starch polysaccharides (NSP), is a type of complex carbohydrate that the human digestive system cannot completely break down in the small intestine. This unique characteristic sets it apart from other types of carbohydrates, such as sugars and starches, which are typically digested and absorbed for energy.

Non-starch polysaccharides include various forms of fiber, such as cellulose and hemicellulose, which contribute to digestive health by adding bulk to stool and helping to regulate bowel movements. They are also beneficial for maintaining gut health and can assist in managing blood sugar levels. This ability to pass through the digestive tract without being broken down is what defines NSP as part of dietary fiber.

On the other hand, sugars and starches are forms of carbohydrates that are broken down into glucose or other simple sugars during digestion, providing energy. Hence, they do not meet the criteria specified in the question. Fiber, while a broader term that includes all forms of dietary fiber, does not specifically capture the precise scientific term "non-starch polysaccharides" that differentiates it from other carbohydrate types. Therefore, non-starch polysaccharides (NSP) is the most accurate answer in this context.