Fructose is a simple sugar (monosaccharide) naturally found in fruits, honey, and some vegetables, and is also a major component of added sweeteners such as sucrose (table sugar) and high-fructose corn syrup. Unlike glucose, which is used widely by cells throughout the body, fructose is primarily metabolized in the liver, where it enters energy pathways through distinct biochemical steps. Credit: Shutterstock
Researchers highlight fructose’s distinct role in obesity, metabolic syndrome, and other chronic diseases.
A popular sweetener found in everything from sodas to processed snacks may be doing more than just adding calories. A new report in Nature Metabolism highlights the distinct and often overlooked role of fructose, a simple sugar naturally found in fruit and widely used in sweeteners, in driving disease.
Researchers examined how common dietary sweeteners, including table sugar (sucrose) and high-fructose corn syrup, affect human health. Although both contain glucose and fructose, the analysis shows that fructose has specific metabolic effects that may play a more direct role in obesity and related disorders.
Fructose acts beyond simple calories
“Fructose is not just another calorie,” said Richard Johnson, MD, professor at the University of Colorado Anschutz and study lead author. “It acts as a metabolic signal that promotes fat production and storage in ways that differ fundamentally from glucose.”
Fructose is naturally found in fruits, honey, and some vegetables, but it’s also widely used in processed foods as a sweetener. Common sources include table sugar (sucrose, which is half fructose), high-fructose corn syrup in sodas and sweetened drinks, baked goods, candies, cereals, flavored yogurts, and many packaged snacks. Credit: Stock
The report describes how fructose is processed in the body in a way that bypasses important regulatory steps in normal energy pathways. This can increase fat production, reduce cellular energy levels (ATP), and generate compounds associated with metabolic dysfunction. Over time, these changes may contribute to metabolic syndrome, which includes conditions such as obesity, insulin resistance, and increased cardiovascular risk.
Hidden sources and internal production
The researchers also note that fructose is not only obtained through diet. The body can produce it internally from glucose, indicating that its influence on health may be more extensive than previously understood.
The findings come at a time of growing concern over global increases in obesity and diabetes. While some countries have reduced consumption of sugary drinks, overall intake of “free sugars” remains higher than recommended in many regions and continues to rise in others.
Evolutionary advantage turned modern risk
Although fructose may once have served an adaptive purpose by helping the body store energy during periods of limited food availability, the researchers argue that in modern environments with constant access to food, these same processes now contribute to chronic disease.
“This review highlights fructose as a central player in metabolic health,” said Johnson. “Understanding its unique biological effects is critical for developing more effective strategies to prevent and treat metabolic disease.”
Reference: “Fructose: metabolic signal and modern hazard” by Richard J. Johnson, Miguel A. Lanaspa, Dean R. Tolan, Marcus D. Goncalves, Samir Softic, Kimber L. Stanhope, Laura G. Sánchez-Lozada, Mark A. Herman and Joshua D. Rabinowitz, 17 April 2026, Nature Metabolism.
DOI: 10.1038/s42255-026-01506-y
This work was supported by National Institutes of Health grants CA258697 and DK132427 (to M.D.G.) and UO1 AA027997 (to R.J.J).
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