According to research reviewed by Gram, the sugar-like compound 1,5-anhydro-D-fructose was linked to better grip strength and fewer damaged muscle fibers in aged mice. These animal findings are promising, but human studies are still needed before anyone can rely on it for muscle health.
Aging muscles tend to shrink and weaken over time, a condition called sarcopenia. According to research reviewed by Gram, a naturally occurring sugar-like compound called 1,5-anhydro-D-fructose (1,5-AF) showed promising effects in studies on roundworms and aged mice. In the worms, it supported movement later in life and increased proteins that build muscle fibers. In older mice, it improved grip strength, reduced damaged muscle fibers, and shifted muscles toward a more endurance-oriented type. The compound also appeared to reduce fat buildup and scarring in the liver. These are early findings from animal studies, so they do not yet show that 1,5-AF works the same way in people. Still, the results point to a possible dietary approach worth testing in human research.
Key Statistics
A 2026 animal study published in The Journal of Nutritional Biochemistry found that dietary 1,5-anhydro-D-fructose was associated with improved grip strength and fewer damaged muscle fibers in aged mice.
A 2026 study using roundworms and aged mice reported that 1,5-anhydro-D-fructose was linked to better late-life movement and a shift toward more oxygen-dependent muscle fibers, according to Gram Research analysis.
The Quick Take
- What they studied: Can a naturally occurring sugar-like compound called 1,5-anhydro-D-fructose, taken in the diet, help slow the loss of muscle strength that comes with aging?
- Who participated: The study used two kinds of test subjects: roundworms (C. elegans), a common lab animal used in aging research, and older laboratory mice. The exact number of animals was not reported in the summary provided.
- Key finding: In aged mice, the compound improved grip strength and reduced damaged muscle fibers. In roundworms, it supported movement later in life. Because these are animal studies, the results show links rather than proven benefits in people.
- What it means for you: This research is early and comes from animals, so it cannot yet tell you whether 1,5-AF helps human muscles. Anyone interested in protecting muscle as they age should focus on proven steps like regular strength training and enough protein, and talk with a doctor before trying any supplement.
The Research Details
The researchers tested 1,5-anhydro-D-fructose, often shortened to 1,5-AF, across two different aging models. First, they gave it to roundworms, which age quickly and are useful for studying how aging works at a basic level. They measured how well the worms moved late in life and checked which genes related to muscle proteins were turned on.
Second, they gave the compound to older mice. The team tested grip strength, examined muscle tissue under a microscope to count damaged fibers, and looked at the types of muscle fibers present. They also measured energy-producing proteins inside the mitochondria, which are the parts of cells that generate energy.
Finally, the researchers examined the liver, looking for fat buildup, scarring, and immune cells linked to inflammation. Using two different species makes it more likely that a finding is real and not a quirk of one animal, though animal results do not always carry over to people.
Using both worms and mice allowed the researchers to check whether the effects appeared in more than one aging model. Testing muscle function, muscle structure, and muscle energy systems together gives a fuller picture than any one measure alone. This approach is a common first step before deciding whether a compound deserves testing in people, but it cannot replace human trials.
The study was published in a peer-reviewed nutrition science journal, which means outside experts reviewed it before publication. Its strength lies in testing the same compound in two different species. However, the summary does not report the number of animals per group, the exact dose, how long the treatment lasted, or whether the researchers accounted for all possible confounding factors. Those details matter for judging reliability, so readers should look at the full paper before drawing firm conclusions.
What the Results Show
In roundworms, 1,5-AF was linked to better movement late in life. This is an important signal because loss of movement is one of the clearest signs of aging in these animals. The researchers also found that the worms had higher levels of gene activity for myofibrillar proteins, which are the structural proteins that make up the working parts of muscle fibers.
In older mice, the compound was associated with better forelimb grip strength. The researchers also observed fewer rimmed vacuole-containing muscle fibers. These are damaged muscle fibers with abnormal holes or clusters inside them, and they tend to increase with age and in certain muscle diseases. Seeing fewer of them suggests the compound may help protect muscle structure.
The mice also showed a shift toward a more oxidative muscle fiber type, meaning muscle fibers that rely more on oxygen to produce energy and resist fatigue. Along with this, the mice had higher levels of proteins tied to mitochondria, the energy-producing parts of cells. Together, these changes suggest the compound may support the energy systems that muscles depend on as they age.
Beyond muscle, 1,5-AF was associated with less fat buildup in the liver and less liver scarring, known as fibrosis. Fatty liver and scarring are common concerns in aging and in metabolic conditions. The researchers also noted a trend toward fewer macrophages, which are immune cells that gather in damaged tissue. The word trend means this effect was not clear-cut, so it should be treated as a tentative observation. These liver and immune findings suggest the compound may influence whole-body health, not only muscle.
Earlier studies have explored 1,5-AF in relation to gut bacteria, oxidative stress (cell damage caused by unstable molecules), and metabolic conditions such as obesity and blood sugar problems. This new work extends that research by asking whether the compound affects aging muscle specifically. It fits a broader pattern in aging research, where compounds that support energy production inside cells are studied as possible ways to protect muscle. Still, no large human trials of 1,5-AF for muscle loss were described in the summary provided.
The most important limitation is that roundworms and mice are not people. Muscle biology overlaps across species, but human aging involves diet, activity, hormones, and disease in ways animal models cannot fully capture. The summary also describes associations, which means the study shows that the compound and the changes appeared together but does not fully prove cause and effect. Key details such as the number of animals, the dose, the length of treatment, and the statistical methods were not included in the summary. The liver immune cell finding was only a trend, so it is not strong evidence on its own. Finally, the compound’s long-term safety in people has not been established by this research.
The Bottom Line
Confidence is low to moderate that 1,5-AF may support muscle health in aging animals, based on this study alone. Confidence that it helps human muscles is currently low because no human results are reported here. The strongest evidence for protecting muscle with age still comes from regular resistance exercise and adequate protein intake, which have extensive human research behind them. Anyone considering a 1,5-AF supplement should first discuss it with a healthcare provider.
Researchers studying aging, muscle loss, and nutrition should pay close attention, since this work points to a new compound worth testing in people. Older adults concerned about losing strength may find it interesting as a topic to discuss with their doctor. People who are pregnant, nursing, managing a medical condition, or taking medications should be especially careful about any new supplement. Healthy adults looking for everyday muscle support should focus on proven habits first.
Human studies on this compound would take time to design, fund, and complete, so practical use based on this research is likely years away. Even after human trials begin, muscle changes from any intervention typically take many weeks to months of consistent effort to become measurable. Readers should not expect quick results from this compound based on the current evidence.
Frequently Asked Questions
Can 1,5-anhydro-D-fructose help prevent muscle loss as you get older?
Early research suggests it may help. A 2026 study found that aged mice given the compound showed better grip strength and fewer damaged muscle fibers. Human studies have not yet confirmed these effects, so it is not proven for people.
What is sarcopenia and why does it happen with age?
Sarcopenia is the gradual loss of muscle mass and strength that occurs with aging. It can make everyday tasks harder and raise the risk of falls. Regular strength training and adequate protein intake are established ways to slow it.
Is 1,5-anhydro-D-fructose safe to take as a supplement?
The 2026 study focused on how the compound affected muscle and liver health in animals and did not establish long-term safety in people. Anyone considering it should consult a healthcare provider, especially if they take medications or have a medical condition.
What are the best proven ways to protect muscle strength after age 50?
Resistance training two to three times per week and eating adequate protein are supported by extensive human research. Many guidelines suggest about 1.0 to 1.2 grams of protein per kilogram of body weight daily for older adults, though needs vary by person.
Want to Apply This Research?
- Track grip strength monthly using a simple hand dynamometer or a timed farmer’s carry with a consistent weight, recording the result in the app. Also log daily protein grams and weekly strength training sessions so changes can be compared against your own baseline.
- Encourage users to add two strength training sessions per week and to spread protein across meals, aiming for consistent intake. If a user is interested in 1,5-AF, the app can prompt them to review the research with a healthcare provider before making any supplement changes.
- Create a quarterly review that compares grip strength, daily protein intake, training consistency, and any changes in energy or daily activity levels. Share these trends with a doctor during routine checkups, and update the app’s guidance as human research on 1,5-AF becomes available.
This article summarizes early research conducted in roundworms and mice, which does not establish safety or effectiveness in humans. It is not medical advice. Talk with a qualified healthcare provider before starting any supplement, changing your diet for a health condition, or making decisions about muscle health.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.