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Effects of Carbohydrates on Body

author image Angela Lang
Based in Maryland, Angela Lang has been a freelance writer since 2010. She has been a registered dietitian since 1998 and is an avid nutrition educator in areas including diabetes, cancer and weight loss. Lang's interests include healthy eating to reduce obesity and disease. She holds a Master of Science in human resource development from Towson University.
Effects of Carbohydrates on Body
Carbohydrates in white bread are converted into glucose during digestion. Photo Credit Monkey Business Images/Monkey Business/Getty Images

Depending on your own lifestyle and health, when you hear the word "carbohydrate," you might immediately think of a diet limiting your favorite high-carb foods. You may also think about limiting carbs to control diabetes. Carbs are actually an essential nutrient that creates a form of energy called glucose, which Harvard School of Public Health describes as "a universal energy source."

Primary Function

Effects of Carbohydrates on Body
The primary function of carbs is to supply energy to the body. Photo Credit Maridav/iStock/Getty Images

The primary function of carbs is to supply energy to the body. Carbs in combination with proteins, fats, vitamins and minerals make up the essential nutritional components needed for life. While carbs provide adequate caloric value to maintain the body's vital functions and are the body's preferred source of energy, they cannot supply all of the nourishment needed to maintain adequate health for an extended period of time.


Effects of Carbohydrates on Body
The brain benefits from the energy provided by glucose. Photo Credit Mike Watson Images/moodboard/Getty Images

Once a carb has been consumed, it immediately enters the digestive process in the mouth. Once the carb has been chewed, it enters the stomach, where it is broken down into smaller parts, which are forms of sugar. This sugar is absorbed into the small intestine and transported to the bloodstream. After glucose enters the bloodstream, it is transported throughout the body to various organs to be used for energy. In addition to the body's organs, muscles and the brain benefit from the energy provided by glucose, also known as blood sugar.

Weight Gain

Effects of Carbohydrates on Body
The body doesn't always need all the energy provided by the glucose. Photo Credit kzenon/iStock/Getty Images

The body does not always need all of the energy provided by the glucose in the bloodstream. Extra glucose is then taken to the liver and skeletal muscles for storage in the form of glycogen, which is ready for use when the body's energy needs exceed the amount of glucose available. The body can only store a limited amount of glycogen, so any extra glucose is stored in the body as fat. This extra fat leads to weight gain.

Protein as Fuel

Effects of Carbohydrates on Body
Protein is an essential nutrient. Photo Credit mathieu boivin/iStock/Getty Images

Protein is an essential nutrient. Its primary role is the development of tissue and muscle. Protein is available as a source of energy when carb intake is not adequate. When carbs are not readily available for energy, protein is broken down for energy. This breakdown can put added stress on the kidneys, with protein byproducts being excreted in urine. According to Iowa State University, "Carbohydrate spares the use of protein as an energy source."

Brain Function

Effects of Carbohydrates on Body
You may feel dizzy and weak without adequate carb intake. Photo Credit Medioimages/Photodisc/Photodisc/Getty Images

The brain and central nervous system rely on glucose for their primary source of energy. Without adequate carb intake and glucose levels, you might begin to feel tired, dizzy and weak. Athletes need adequate amounts of carbs prior to a competition for optimal physical and mental results.

Fiber Source

Effects of Carbohydrates on Body
Indigestible carbs exist as dietary fiber. Photo Credit indigolotos/iStock/Getty Images

Indigestible carbs exist as dietary fiber. The body needs fiber for two primary functions. Insoluble fiber is needed to increase the bulk of the stool and assist in regularity of bowel movements. Whole wheat bread, grains, fruits and vegetables are good sources of insoluble fiber. Soluble fiber -- found in oats, beans and barley -- is believed to help lower cholesterol and decrease glucose levels.

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