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Ch.6 Carbohydrates–Life’s Sweet Molecules
Chapter 3, Problem 82

ALLIED Health Our bodies cannot digest cellulose because we lack the enzyme cellulase. Why is cellulose an important part of a healthy diet if we cannot digest it?

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Cellulose is a type of carbohydrate known as a polysaccharide, composed of glucose units linked by β(1→4) glycosidic bonds.
Humans lack the enzyme cellulase, which is necessary to break down these β(1→4) bonds, making cellulose indigestible for us.
Despite being indigestible, cellulose is an important dietary fiber that aids in the movement of food through the digestive tract.
Dietary fiber like cellulose helps to maintain bowel health, prevent constipation, and may lower the risk of certain digestive disorders.
Incorporating cellulose-rich foods into the diet can contribute to a feeling of fullness, which may help with weight management.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Cellulose

Cellulose is a complex carbohydrate and a major component of plant cell walls. It is a type of dietary fiber that humans cannot digest due to the absence of the enzyme cellulase. Despite being indigestible, cellulose plays a crucial role in promoting digestive health by adding bulk to stool and aiding in regular bowel movements.
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Dietary Fiber

Dietary fiber refers to plant-based carbohydrates that are not fully broken down by human digestive enzymes. It is classified into soluble and insoluble fiber, both of which contribute to various health benefits, including improved digestion, lower cholesterol levels, and better blood sugar control. Cellulose, as an insoluble fiber, helps maintain gut health and prevent constipation.
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Gut Health

Gut health encompasses the balance and function of the gastrointestinal tract, which is essential for overall health. A healthy gut microbiome, supported by dietary fiber like cellulose, can enhance nutrient absorption, boost the immune system, and reduce the risk of gastrointestinal disorders. Consuming adequate fiber is vital for maintaining this balance and promoting a healthy digestive system.
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