Question

Open Ended Why can't humans digest all carbohydrates?

   Open Ended Why can't humans digest all carbohydrates?

Glencoe Biology

Glencoe Biology

Alton Biggs 1st Edition

Chapter 6, Problem 46

Instant Answer

Solved by Expert Jessica Wooten

07/05/2020

Step 1

These enzymes are necessary to break down complex carbohydrates like cellulose. In mathematical terms, if we denote the enzyme as E and the carbohydrate as C, the digestion process can be represented as: \[C + E \rightarrow D + E\] where D represents the digested Show more…

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Open Ended Why can't humans digest all carbohydrates?

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Key Concepts

Carbohydrate Structure

The structure of carbohydrates plays a critical role in their digestibility. Human digestive enzymes can only break down specific chemical bonds found in certain carbohydrates. For example, enzymes like amylases target particular glycosidic bonds present in starches, but other bonds, such as the beta-linkages in cellulose, cannot be broken by human enzymes. This specificity in bond structure means that only certain carbohydrates can be digested efficiently by the human body.

Enzyme Specificity

Enzymes in the human digestive system have evolved to process specific types of carbohydrates. These enzymes, such as salivary and pancreatic amylase, are highly specialized and work on breaking down the bonds in easily digestible carbohydrates. However, they are not effective against other carbohydrate forms that require different enzymatic activities. The limitation in enzyme types and their specificity is a major reason why humans cannot digest all carbohydrate forms.

Indigestible Carbohydrates

Some carbohydrates, such as dietary fiber, cannot be digested by humans because they contain structural features that resist breakdown by digestive enzymes. While these fibers pass through the digestive tract largely intact, they play an important role in maintaining gut health by aiding in digestion and promoting beneficial bacterial activity. This indigestibility is a double-edged sword, as it both limits caloric extraction and contributes to overall digestive health.

Gut Microbiota

Although humans lack the enzymes to break down all types of carbohydrates, the gut microbiota help in fermenting and processing some of these complex carbohydrates. Microbes in the large intestine are capable of breaking down components that human enzymes cannot, producing short-chain fatty acids and other beneficial substances in the process. This symbiotic relationship partially compensates for the enzymatic limitations of the human digestive system.

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