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Carbohydrates come in two basic forms: complex and simple. Simple carbs are one, two, or at most three units of sugar linked together in single molecules. Complex carbs are hundreds or thousands of sugar units linked together in single molecules. Simple sugars are easily identified by their taste: sweet. Complex carbs, such as potatoes, are pleasant to the taste buds, but not sweet.
There are two groups of complex carbs: high fiber and low fiber. High-fiber, complex carbs are not digestible, at least not by human beings, because we do not have the enzyme to do the job. Cows have that enzyme; that is why they can get calories out of grass, and we cannot. The main stuff in high-fiber, complex carbs which is indigestible by humans is called "cellulose."
High-fiber (high-cellulose) vegetable foods are the healthiest choices for human nutrition, and intake of these foods is associated with lowered incidences of hypertension, cancer, arthritis, diabetes, etc. Examples are lettuce and broccoli. Examples of low-fiber, complex carbs are banana, tomato, squash and all cereals and grains (therefore bread and pasta), potatoes and rice
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