High-Fructose Corn Syrup (HFCS)
sugarA sweetener made by converting corn starch glucose to fructose.
Definition
A sweetener made by converting corn starch glucose to fructose. Common varieties are 42% or 55% fructose. Widely used in processed foods and beverages. Associated with obesity and metabolic syndrome when over-consumed.
What Is High-Fructose Corn Syrup?
High-fructose corn syrup (HFCS) is a liquid sweetener derived from corn starch. It is produced by enzymatically converting a portion of the glucose in corn syrup to fructose, yielding a sweeter product than regular corn syrup. The two most common commercial forms are HFCS-42 (42% fructose, 58% glucose) and HFCS-55 (55% fructose, 45% glucose), where the number refers to the percentage of fructose by weight.
HFCS-55 is predominantly used in soft drinks, while HFCS-42 is more common in baked goods, canned fruits, and dairy products. HFCS was developed in the late 1960s and became widely adopted in the United States food supply during the 1970s and 1980s, largely due to its lower cost compared to sucrose.
Comparison with Sucrose
HFCS and sucrose are compositionally similar. Sucrose is 50% fructose and 50% glucose (chemically bonded), while HFCS-55 is 55% fructose and 45% glucose in free, unbound form. Because the sugars in HFCS are already separated, no enzymatic digestion is required before absorption, potentially leading to slightly faster uptake. However, the overall metabolic effects of HFCS and sucrose in equivalent amounts are broadly similar according to current scientific consensus.
| Sweetener | Fructose % | Glucose % | Form |
|---|---|---|---|
| Sucrose | 50% | 50% | Disaccharide (bonded) |
| HFCS-42 | 42% | 58% | Free monosaccharides |
| HFCS-55 | 55% | 45% | Free monosaccharides |
Health Considerations and Context
HFCS has been the subject of considerable public health debate. Some research has associated high intake of HFCS-sweetened beverages with obesity, insulin resistance, elevated triglycerides, and non-alcoholic fatty liver disease. However, most scientific bodies conclude that these harms are attributable to excess added sugar consumption in general, not to HFCS specifically relative to sucrose.
Key considerations include:
- Both HFCS and sucrose provide 4 kcal per gram with no essential nutrients
- The rise in HFCS consumption paralleled increased caloric intake from all sweeteners
- Reducing total added sugar intake remains the primary dietary recommendation regardless of source
On food labels in the United States, HFCS must be listed by name and appears under the "Total Sugars" and "Added Sugars" lines on the Nutrition Facts panel.