High-fructose corn syrup (HFCS)
High-fructose corn syrup is a caloric liquid sweetener made from corn starch, used heavily in soft drinks and packaged foods. Nutritionally it is broadly similar to table sugar — both deliver glucose and fructose and similar calories — and health guidance treats it the same way: an added sugar to limit.
At a glance
What high-fructose corn syrup is
High-fructose corn syrup is a liquid sweetener made by processing corn starch into corn syrup — which is essentially all glucose — and then converting some of that glucose into fructose. The result is a syrup containing both sugars in proportions close to those of table sugar. The two common food grades are HFCS-42 (about 42% fructose) and HFCS-55 (about 55% fructose, used widely in soft drinks).
Because it is an inexpensive liquid that mixes and stores easily, HFCS became a dominant sweetener in sodas, sweetened drinks, and many packaged and processed foods.
How the body handles it
HFCS delivers glucose and fructose — the same two simple sugars that table sugar delivers, just not chemically bonded as they are in sucrose. The glucose raises blood sugar; the fructose is processed largely by the liver. Its caloric and glycemic profile is broadly similar to that of table sugar.
The "high-fructose" name causes a common misunderstanding: the fructose share in HFCS-55 is only modestly higher than the roughly 50% fructose in table sugar itself. The two are nutritionally close — see below.
What health guidance says
On HFCS, guidance is consistent and easy to state precisely.
HFCS and table sugar — the honest comparison
Nutritionally, HFCS and table sugar are broadly similar; major health authorities treat them as equivalent added sugars.
HFCS is sometimes singled out as uniquely harmful. The accurate position is more measured: because HFCS and sucrose deliver similar amounts of glucose and fructose and similar calories, health authorities generally treat them as comparable added sugars rather than ranking one as clearly worse. The concern with HFCS is the same concern that applies to added sugars in general.
The US Dietary Guidelines and the WHO
The Dietary Guidelines name high-fructose corn syrup as an added sugar to limit; the WHO advises limiting free sugars.
The 2025–2030 Dietary Guidelines for Americans explicitly list high-fructose corn syrup among the names added sugars appear under on ingredient labels, and state that "no amount of added sugars or non-nutritive sweeteners is recommended or considered part of a healthy or nutritious diet." The World Health Organization recommends limiting free sugars, the category that includes HFCS. HFCS counts toward the Added Sugars line on the US Nutrition Facts panel.
How to read this honestly
The honest summary has two parts. First, HFCS is a caloric, high-glycemic added sugar, and US and global guidance advise limiting it — that is straightforward and well supported. Second, the popular idea that HFCS is dramatically worse than ordinary sugar is not well supported; the two are nutritionally close, and the real issue is total added-sugar intake. Stating both keeps the page accurate rather than echoing a myth.
The honest pros and cons
WHAT HFCS DOES WELL
- Full sweetening function — it is a sugar mixture.
- Liquid form mixes and stores easily in manufacturing.
- Inexpensive, which is why it is so widely used.
THE TRADE-OFFS
- Fully caloric and high-glycemic.
- Counts toward the Added Sugars line on the US label.
- Named by the Dietary Guidelines as an added sugar to limit.
- WHO advises limiting free sugars, which include HFCS.
HFCS compared to allulose
| Property | HFCS | Allulose |
|---|---|---|
| Type of ingredient | Added sugar (glucose + fructose syrup) | Rare sugar (monosaccharide) |
| Calories per gram | ~4 | ~0.4 |
| Glycemic index | High | Zero |
| Browns & caramelizes | Yes | Yes |
| Counts as Added Sugar (US label) | Yes | No — FDA-excluded |
| Health-guidance position | Limit (added sugar) | Named by neither the added-sugar nor the non-nutritive-sweetener warning |
HFCS is a conventional caloric added sugar that counts on the Added Sugars line and that guidance advises limiting. Allulose is a rare sugar that the FDA excludes from the Added Sugars line, with roughly a tenth of the calories and a glycemic index of zero, while still browning and caramelizing.
Common questions
Is high-fructose corn syrup worse than sugar?
Nutritionally, HFCS and table sugar are broadly similar — both deliver glucose and fructose and comparable calories. Major health authorities generally treat them as comparable added sugars. The popular idea that HFCS is dramatically worse than ordinary sugar is not well supported; the real issue is total added-sugar intake.
Does HFCS raise blood sugar?
Yes. HFCS delivers glucose, which raises blood sugar, and has a high glycemic impact broadly similar to table sugar.
Is HFCS an added sugar?
Yes. High-fructose corn syrup counts toward the Added Sugars line on the US Nutrition Facts panel, and the Dietary Guidelines list it among added-sugar ingredient names.
Why is HFCS in so many products?
HFCS is an inexpensive liquid sweetener that mixes and stores easily, which made it attractive for soft drinks and packaged foods.
Selected sources
- Dietary Guidelines for Americans, 2025–2030 — added sugars, including high-fructose corn syrup among added-sugar names.
- World Health Organization — guidance on free-sugar intake.
- US Food & Drug Administration — Nutrition Facts label and the Added Sugars line.
Compare the alternatives
See how high-fructose corn syrup and the other sweeteners line up on calories, glycemic impact and baking behavior — all 21 side by side.
Open the comparison hub →Sweeteners & the glycemic index →