High-fructose corn syrup composition, metabolism and the obesity hypothesis
What it found
High-fructose corn syrup is made of the same sugars as table sugar and is processed by the body in the same way.
The author found no evidence that it uniquely drives weight gain in people.
What they found
Studies in people
Not sweeter than sugar
Taste panels found that the 55% type matches table sugar for sweetness when mixed into drinks. The 42% type is slightly less sweet than table sugar.
No difference from sugar in women
A trial gave normal-weight women either high-fructose corn syrup or table sugar at 30% of their calories for two days. Blood sugar, insulin, hunger hormones, and calorie intake were about the same for both.
US weight trends diverge
Calories from this sweetener per person have fallen since 2002 in the United States. Meanwhile, national obesity rates kept climbing, reaching 23.7% by 2005.
Global use is small
This sweetener makes up only 8% of added sugars used worldwide. Countries that barely use it, like Mexico and Argentina, still have high obesity rates.
Other findings
Same sugars as sucrose
The two main types contain 42% or 55% fructose, with the rest being glucose. This is nearly a one-to-one mix, just like table sugar, honey, and fruit juices.
Metabolism matches sugar
Once in the blood, the body cannot tell these sugars apart from those in table sugar or honey. They reach the same tissues through the same pathways in the same time frame.
What the authors conclude
- They conclude that the idea linking this sweetener uniquely to obesity is not supported in the United States or anywhere else.
- They advise that replacing it with table sugar would not change calorie intake, basic metabolism, or weight trends.
- They state it is time to retire the idea that this ingredient has an exclusive role in promoting weight gain.
How it was done
A 2004 idea suggested high-fructose corn syrup was a direct cause of rising obesity rates. The author wrote this to examine that idea and clear up confusion for shoppers and health workers.
The author looked at past research on how high-fructose corn syrup is made, what it contains, and how the body handles it. He also compared sweetener use and weight trends in the United States and other countries over several decades.
What it can’t tell you
- This is a review of existing information rather than a new long-term trial tracking weight changes over years.
- Population trends can show whether sweetener use and obesity move together, but they cannot prove one causes the other.
- Short trials lasting two days in normal-weight women cannot show what happens to body weight over months or years.
The paper
- Title
- Straight talk about high-fructose corn syrup: what it is and what it ain't
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people
- Summarised from
- Full text
- Cite
- White JS (2008). Straight talk about high-fructose corn syrup: what it is and what it ain't. The American journal of clinical nutrition. doi:10.3945/ajcn.2008.25825BFree full textPubMed 19064536DOI
Summary written 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error