Let’s begin by defining fructose. Fructose is sometimes referred to as “fruit sugar” because it is often found in fruits. It is a simple sugar and one of the sweetest naturally occurring sugars.

Glucose, fructose, and galactose are the simplest forms of sugar and are called monosaccharides. Sucrose, lactose, and maltose are called disaccharides and are made by combining two monosaccharides.

Medically reviewed by Allison Herries, RDN Invert sugar, or invert syrup, is a liquid sugar used to sweeten foods and beverages. It consists of a 50-50 mixture of fructose and glucose. It is produced ...

Fructose is also present in table sugar, or sucrose — which is made up of glucose and fructose — and it is made in the body from glucose and other carbohydrates, as Costa explained.

Fructose 101. Fructose is naturally present in fruits, vegetables and honey. It makes up about 50% of table sugar (sucrose), along with glucose.