What Are Different Carbohydrates and functions of Carbohydrates?

What Are Different Carbohydrates and functions of Carbohydrates?

Carbohydrates are an important type of macronutrient that play many roles in the body. They are composed of carbon, hydrogen, and oxygen atoms and can be classified into several different types based on their structure and function.

Different types of carbohydrates

Here are the different carbohydrates and a detailed explanation of each :


Monosaccharides are the simplest form of carbohydrates and cannot be broken down into smaller units. They consist of a single sugar molecule and include glucose, fructose, and galactose. Glucose is the primary source of energy for the body and is found in many different types of food. Fructose is found in fruits, honey, and some vegetables, while galactose is found in dairy products.


Disaccharides are made up of 2 monosaccharides joined together. They include sucrose, lactose, and maltose. Sucrose is made up of glucose and fructose. Lactose is made up of glucose and galactose and found in milk. Maltose is found in beer and some cereals and is made up of two glucose molecules.


Oligosaccharides are made up of several (typically 3-10) monosaccharides joined together. They include raffinose and stachyose, which are found in beans, lentils, and other legumes. Oligosaccharides are not digested in the small intestine, but can be fermented by bacteria in the large intestine, producing gas and other byproducts.


Polysaccharides are complex carbohydrates made up of long chains of monosaccharides. They include starch, glycogen, and cellulose. Starch is the main source of carbohydrates in our diet and is found in grains, potatoes, and many other foods. Glycogen is the storage form of glucose in the body and is found in the liver and muscles. Cellulose is a type of fiber found in fruits, vegetables, and whole grains that is not digested by the body but is important for maintaining healthy digestion.


Fiber is a type of carbohydrate and it cannot be digested by the body. It includes soluble fiber, such as pectin and psyllium, and insoluble fiber, such as cellulose and lignin. Soluble fiber can help to lower cholesterol levels and regulate blood sugar levels, while insoluble fiber can help to promote regular bowel movements and reduce the risk of certain diseases.

Functions of Carbohydrates

Carbohydrates play several important functions in the body. Some of the key functions of carbohydrates include:

  • Providing energy: Carbohydrates are the body’s primary source of energy. When consumed, they are broken down into glucose, which can be used by cells throughout the body to produce ATP, the body’s main energy currency.
  • Supporting brain function: The brain relies almost exclusively on glucose as an energy source. When glucose levels in the blood are low, the brain may not function properly, leading to symptoms such as confusion and fatigue.
  • Supporting physical activity: Carbohydrates are particularly important for supporting physical activity and athletic performance. They help to fuel muscular contractions and are particularly important for high-intensity exercise.
  • Regulating blood sugar levels: Carbohydrates can impact blood sugar levels. Simple carbohydrates, such as those found in candy and other sugary foods, can cause a rapid rise in blood sugar levels, while complex carbohydrates, such as those found in whole grains and vegetables, are broken down more slowly and can help to maintain steady blood sugar levels.
  • Providing fiber: Carbohydrates in the form of fiber are important for maintaining healthy digestion and can help to reduce the risk of certain diseases, such as heart disease and diabetes.
  • Supporting immune function: Certain types of carbohydrates, such as those found in fruits and vegetables, may play a role in supporting immune function and reducing the risk of certain diseases.
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