Carbohydrate

A carbohydrate is a type of sugar or a sugar-like substance found in many foods we eat. These tiny building blocks are important for giving our bodies energy to move, grow, and stay healthy. Some carbohydrates, like starch, are stored in our bodies to use later, while others help build and fix our cells.

Carbohydrates come in many forms. Simple sugars, such as glucose and fructose, are found in fruits, honey, and even in our blood. More complex carbohydrates, called polysaccharides, include starch in grains like wheat, rice, and maize, and cellulose in plant fibers. These help us feel full and give us lasting energy.

In living things, carbohydrates play many important jobs. They are part of the genetic codes that tell our cells how to work, like in RNA and DNA. They also help our immune systems fight off germs, support how our blood clots, and even help plants and animals build their structures, like the cellulose in plant walls or chitin in the shells of insects.

We get carbohydrates from many everyday foods. Bread, pasta, and rice all contain starch. Fruits and vegetables give us natural sugars, and milk has lactose. Even sweets like cakes and candies often have added sugars like table sugar from sugarcane or sugar beets. Understanding carbohydrates helps us make healthy choices and gives our bodies the fuel they need to work properly.

Terminology

The word "carbohydrate" can mean different things depending on how it is used. It is often used to describe foods like cereals, bread, pasta, candy, jams, and desserts. These foods are rich in sugars or starches. Carbohydrates can also include dietary fiber, such as cellulose found in plants.

The simplest carbohydrates are called saccharides. The most basic type is called a monosaccharide, which cannot be broken down into smaller sugars. Common examples include disaccharides like sucrose (table sugar) and polysaccharides such as starch and cellulose. These sugars can link up with other molecules to form important structures in cells, helping cells stick together and communicate with each other.

Main articles: Glycoconjugates and Glycosylation

History

The story of carbohydrates is tied to the history of sugar cane, which was first grown in New Guinea. Later, it was widely cultivated in India, and eventually made its way to Europe and the New World.

Important discoveries about carbohydrates began in the early 1800s. In 1811, a scientist found that boiling starch with acid produces grape sugar, also known as glucose. Over time, many scientists contributed to our understanding of these important molecules, with several receiving Nobel Prizes for their work.

Nutrition

Carbohydrates are important for giving our bodies energy. When we eat foods with carbohydrates, like sugars or starches, we get energy to help us stay active. Foods like bread, pasta, fruits, and vegetables contain carbohydrates. Some foods, like candies and soft drinks, have a lot of simple sugars that give a quick burst of energy. Other foods, like whole grains and beans, release energy more slowly, which helps keep us feeling good for longer.

Our bodies can use many different types of carbohydrates for energy, but some we can’t break down on our own. For example, we can’t digest cellulose, which is found in plant fibers. Even though we can’t use it for energy, fiber is important because it helps our digestion stay healthy. Experts suggest that we get a good part of our energy from foods with whole grains and other plant-based carbohydrates. This helps keep our bodies healthy and gives us important nutrients.