Sugars are simple carbohydrates that provide the main source of energy to the body. They occur naturally in foods or are added to them during preparation and processing. Most types of sugars taste sweet, although some do not.

Sugars are found in nutritious foods such as fruits, vegetables and milk products. They also are found in processed foods with few nutrients, including candy, soda and other sweets. Sugars are commonly thought of as the white, granular substance known as table sugar. However, there are many different types of natural sugars, including glucose, fructose, galactose, sucrose, lactose and maltose. 

In addition to providing the body with energy, sugars serve as a food sweetener and preservative. However, sugars also can have negative health impacts. Consuming too much sugar can contribute to both weight gain and tooth decay.