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 we use it. It often describes foods like cereals, bread, pasta, candy, jams, and desserts. These foods are full of 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 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 connect with other molecules to help build important parts of cells, letting cells stick together and talk to each other.

Main articles: Glycoconjugates and Glycosylation

History

The story of carbohydrates is connected to the history of sugar cane, which was first grown in New Guinea. Later, it was grown in India, and then it reached Europe and the New World.

Important discoveries about carbohydrates started in the early 1800s. In 1811, a scientist found that boiling starch with acid makes grape sugar, also called glucose. Many scientists helped us learn about these important molecules, and some won Nobel Prizes for their work.

Nutrition

Carbohydrates help our bodies get energy. When we eat foods with carbohydrates, like sugars or starches, we get energy to stay active. Foods such as bread, pasta, fruits, and vegetables have carbohydrates. Some foods, like candies and soft drinks, have simple sugars that give quick energy. Other foods, like whole grains and beans, release energy slowly, helping us feel good longer.

Our bodies can use many types of carbohydrates for energy, but some we can’t break down. For example, we can’t digest cellulose, found in plant fibers. Even though we can’t use it for energy, fiber helps our digestion stay healthy. Experts suggest getting a lot of our energy from whole grains and other plant-based carbohydrates. This keeps our bodies healthy and gives us important nutrients.