High-Fructose Corn Syrup vs Sugar

High-fructose corn syrup (HFCS) has a reputation as one of the worst ingredients in the American diet. But how different is it from regular table sugar? This guide explains what HFCS is, how it compares with sugar chemically and in research, why it became so common, and what actually matters when you read a label.

What high-fructose corn syrup is

HFCS is a sweetener made from corn starch. The starch is broken down into glucose, and enzymes then convert some of that glucose into fructose, which tastes sweeter. The result is a liquid syrup that's easy to mix into drinks and foods.

The two most common types are:

• HFCS-55: about 55% fructose and 42% glucose, used mostly in soft drinks.
• HFCS-42: about 42% fructose and 53% glucose, used in foods like baked goods, cereals, canned fruit, and condiments.

The remaining few percent are other sugars. Despite the name, HFCS isn't especially "high" in fructose compared with table sugar. It was named that way because it's higher in fructose than ordinary corn syrup, which is nearly all glucose.

How it compares with table sugar

Table sugar, or sucrose, is made from sugarcane or sugar beets. Each sucrose molecule is one glucose and one fructose bonded together, so it's 50% fructose and 50% glucose. In the digestive tract, that bond is quickly broken, and the body absorbs glucose and fructose separately, just as it does from HFCS.

So the key differences are small:

• Fructose share: 42% or 55% for HFCS, compared with 50% for sucrose.
• Form: HFCS has free glucose and fructose; sucrose has them bonded until digestion.
• Calories: both provide about 4 calories per gram.
• Labeling: both count as added sugars on the Nutrition Facts label.

The FDA lists HFCS as "generally recognized as safe" (GRAS) under 21 CFR 184.1866, with the same status as other common sugars.

What the research says

Head-to-head studies

Controlled studies that compare HFCS and sucrose in equal amounts have generally found similar effects on body weight, blood sugar, insulin, appetite, and blood fats. Reviews from groups including the American Medical Association have concluded that there isn't enough evidence to treat HFCS as more harmful than other caloric sweeteners.

Why HFCS got its reputation

Interest in HFCS grew in the early 2000s, when researchers noticed that its rise in the US food supply roughly tracked the rise in obesity. That pattern, however, is also consistent with Americans simply eating and drinking more added sugar and more calories overall. Correlation over time doesn't show that HFCS itself was the cause.

According to the USDA Economic Research Service, per-person availability of HFCS in the US peaked around 1999 and has fallen since, while obesity rates have continued to rise. That's another reason most researchers focus on total added sugars rather than HFCS alone.

Where concern is justified

Some research suggests that very high intakes of fructose, from any source, can raise triglycerides and increase fat in the liver, especially when people take in more calories than they need. This is a concern about excess added sugar, whether it comes from HFCS, table sugar, honey, or agave syrup, not a reason to single out HFCS.

Why HFCS is so common

HFCS became widespread in the US in the 1970s and 1980s. It's made from domestically grown corn, it's stable in acidic drinks, it blends easily, and it has historically cost less than sugar in the US, partly because of federal sugar import quotas and corn subsidies. That's why HFCS is common in American soft drinks, while many other countries use cane or beet sugar.

In 2012, the FDA denied a petition from the corn industry to rename HFCS "corn sugar," saying the term "sugar" is reserved for solid, crystallized sweeteners.

What matters more than which sweetener

The current Dietary Guidelines for Americans 2025–2030 say no amount of added sugars is recommended as part of a healthy diet and advise no more than 10 g of added sugars in any one meal. The earlier 2020–2025 edition set a limit of less than 10% of daily calories, which is where the FDA's 50 g Daily Value comes from. Neither edition distinguishes between HFCS and other sugars; they count them all together.

Switching from a soda sweetened with HFCS to one sweetened with cane sugar doesn't meaningfully change how much added sugar you're drinking. A 12-ounce regular soda typically contains around 40 g of added sugar either way. Choosing a smaller portion, an unsweetened drink, or water makes a much bigger difference.

Some brands now advertise "no high-fructose corn syrup" on the front of the package. That can be useful if you simply prefer to avoid the ingredient, but it doesn't mean the product is low in sugar. Many of these products use cane sugar, honey, or other syrups instead, and the total amount of added sugar may be the same or even higher. The Added Sugars line on the back tells you what the front doesn't.

How to spot HFCS on a label

• Check the ingredients list for "high fructose corn syrup," sometimes listed alongside "corn syrup" or "glucose-fructose syrup."
• Check the Added Sugars line on the Nutrition Facts label. It includes HFCS along with all other added sugars, so it's the number that tells you the most.
• Use the 5/20 rule. 5% DV or less of added sugars per serving is low; 20% DV or more is high.

How to use this on myfoodfact.com

• See which products contain it on our high-fructose corn syrup ingredient page.
• Find alternatives with little added sugar in low-sugar products.
• Learn how to read both sugar lines in our guide to added sugars vs total sugars.

The bottom line

High-fructose corn syrup and table sugar are very similar: both are roughly half fructose and half glucose, both provide about 4 calories per gram, and controlled studies have found similar effects on health when people eat the same amounts. The research points to total added sugar, not HFCS specifically, as the thing worth limiting. If you want to cut back, the Added Sugars line on the label is your best guide.

This guide is for general information and is not medical advice. People managing diabetes, high triglycerides, or fatty liver disease should follow the guidance of their health care team.