They are commonly used in biochemistry to depict the cyclic forms of sugars. These drawings, by the way, are called Haworth projections. That means they differ in 3D space at the anomeric center the anomeric center is the C=O carbon to which an oxygen binds to form the ring. In carbohydrates, a five-membered ring with an oxygen in it is called a furanose (another common form, a six-membered ring, is called a pyranose). Dietary fiber can't be broken down and absorbed by your digestive system.\): D-threose and its two possible five-membered-ring forms.įor example, D-threose can form two different five-membered rings (that is, rings made from a circle of five atoms).
You probably know that you should eat plenty of fiber, but do you know how much fiber you need, how fiber contributes to good health, or which foods are good sources of fiber? Dietary fiber consists mainly of cellulose, so it is found primarily in plant-based foods, including fruits, vegetables, whole grains, and legumes.
\): Beans are an excellent source of both soluble and insoluble fiber.
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