Corn Syrup High Fructose Corn syrup is glucose produced from corn starch in a process called wet milling. Wet milling isolates the components of the corn through chemical or biochemical separation. The sugars are further separated by the use of enzymes. Since fructose is sweeter but not naturally found in corn, scientists have ways to convert the glucose into fructose. High fructose corn syrup (HFCS), also known as corn sugar, is a combination of glucose and fructose. Depending on the level of sweetness, the glucose to fructose ratio is adjusted. For example HFCS 55 is 55% fructose and is usually used in soft drinks. HFCS 42 is 42% fructose and used in foods that require only a little sweetening. The chemical composition of high fructose corn syrup is similar to that of sucrose, or table sugar. Still, the Food and Drug Administration (FDA) declared that under the formal definition of â€œnatural,â€� HFCS does not meet the requirements. The enzymes that are used to separate the sugars are synthetic, deeming HFCS unnatural. Also, there has been controversial evidence showing that the consumption of HFCS is associated with obesity. Gutierrez, David. "FDA Says High Fructose Corn Syrup Cannot Be Considered "Natural"" Independent News on Natural Health, Nutrition and More. 12 Jan. 2009. Web. 16 May 2011. . Hofstrand, Don. "Specialty Grain Terms A3-50 December 2006." Iowa State University Extension. Dec. 2006. Web. 16 May 2011. . Wilson, J. Justin. "Op-Ed." Center for Consumer Freedom. 15 June 2009. Web. 16 May 2011. .