Fructose is a naturally occurring sugar found in fruit, honey, vegetables, table sugar, and High Fructose Corn Syrup (HFCS). Unlike glucose, which is used directly by nearly every cell for energy, fructose is processed primarily by the liver. While humans have consumed fructose for thousands of years, modern diets provide much larger amounts through added sugars and processed foods. Excessive intake may contribute to fatty liver and other metabolic health concerns.