Oleanolic acid and ursolic acid, two plant compounds found in foods such as apple skins and herbs, reduced muscle wasting in mice fed a high-fat diet in a 2026 study. According to research reviewed by Gram, both compounds improved blood sugar control and helped muscle cells make energy, though human trials are still needed.
Muscle loss linked to obesity is a growing concern, and this new Gram Research analysis looks at whether two natural plant compounds could help. Oleanolic acid and ursolic acid are found in foods such as apple peels, olives, and herbs like rosemary. In this laboratory study published in 2026, researchers fed mice a high-fat diet and treated muscle cells grown in dishes with the compounds. Both compounds improved blood sugar control, reduced muscle shrinkage, and eased inflammation linked to fat. The researchers found that the compounds appear to work by supporting insulin signaling, the body’s system for moving sugar into cells, and by helping mitochondria, the tiny energy producers inside cells, work better. The team also pointed to a protein called PSMB1 as a possible target for future work. These findings are promising, but they come from animals and cell cultures, so they do not yet show that these compounds protect human muscle.
Key Statistics
A 2026 laboratory study published in the Journal of Agricultural and Food Chemistry found that oleanolic acid and ursolic acid reduced obesity-related muscle atrophy in high-fat diet-fed mice.
A 2026 study using mice and palmitic acid-treated muscle cells found that both oleanolic acid and ursolic acid improved mitochondrial respiration, ATP production, and glucose uptake in muscle cells.
The Quick Take
- What they studied: Scientists wanted to know whether two natural plant compounds, oleanolic acid and ursolic acid, could prevent the muscle loss that often happens with obesity, and how they might do it.
- Who participated: The study used laboratory mice of a common research strain that were fed a high-fat diet to cause obesity, along with muscle cells grown in lab dishes. The exact number of mice and cell samples was not reported in the summary, and no people took part.
- Key finding: Both compounds improved blood sugar control, reduced muscle wasting, and lowered inflammation and fat-related problems in the high-fat-fed mice. In muscle cells, they improved energy production and helped cells take in glucose. Because this is animal and cell work, the results show a biological effect but not a proven benefit for people.
- What it means for you: These results are an early step, not a reason to change your diet or start supplements. If you want to support muscle health, regular strength training, enough protein, and a balanced diet with plenty of vegetables and fruits have much stronger evidence behind them. Talk with a doctor before using any supplement that contains these compounds.
The Research Details
The researchers used two types of experiments. In the first, they fed a group of laboratory mice a high-fat diet, which is known to cause weight gain, blood sugar problems, and muscle loss. Some of these mice received oleanolic acid or ursolic acid, and their results were compared with mice that did not receive either compound. This setup lets scientists see whether the compounds make a difference when everything else is kept the same.
In the second experiment, the team used a line of muscle cells grown in dishes and exposed them to palmitic acid, a saturated fat that can damage muscle cells. This approach allowed them to study what happens inside cells in a controlled setting, without the many other factors present in a living body.
The researchers also used gene activity analysis and a database tool called CMap to look for patterns in how cells respond to the compounds. These tools helped them suggest possible targets, such as the PSMB1 protein, that might explain the effects. Together, these methods allowed the team to connect what they saw in whole animals with what happened at the cellular level.
Combining whole-animal and cell experiments is a useful strategy. Animal studies show whether a compound has effects across a whole body, including blood sugar, muscle size, and inflammation. Cell studies reveal the step-by-step processes behind those effects. When both point in the same direction, the evidence is stronger than either approach alone.
This type of research is also an important first stage. It helps scientists decide which compounds deserve testing in people, and it reveals possible mechanisms that later human studies can check. However, the results of animal and cell work do not always carry over to humans, because bodies can process compounds differently.
The study was published in the Journal of Agricultural and Food Chemistry, a peer-reviewed scientific journal, which means outside experts reviewed it before publication. The authors used well-established research models and examined several layers of biology, which adds credibility. The summary does not report the number of animals or cell experiments, however, so it is harder to judge how many samples supported each finding. Readers should also keep in mind that this is a single study, and results often need to be repeated by other teams before they are widely accepted.
What the Results Show
The main result was that both oleanolic acid and ursolic acid improved several markers of health in mice eating a high-fat diet. The compounds helped the mice keep better control of their blood sugar, which matters because poor glucose control is closely tied to muscle loss in obesity. The treated mice also showed less muscle shrinkage than untreated mice on the same diet.
The researchers also observed improvements in blood fats and inflammation. Dyslipidemia, which means unhealthy levels of fats like cholesterol and triglycerides in the blood, was reduced. Inflammation, the body’s ongoing low-level immune response that can harm tissues over time, was also lowered. These changes suggest that the compounds affect the body more broadly than just the muscle.
At the cellular level, the compounds appeared to switch on a chain of signals called the IRS/AKT/mTOR pathway. This pathway acts like a growth switch in muscle, encouraging cells to build and maintain protein. At the same time, the compounds reduced signals that push muscle toward breaking down, including those involving GSK-3β and FOXO1. Together, these changes point toward a shift from muscle breakdown toward muscle maintenance.
The compounds also appeared to help cells manage stress and recycling. They eased endoplasmic reticulum stress, a type of cellular stress that builds up when cells cannot properly fold proteins, and they helped balance autophagy, the process cells use to clean out damaged parts. Mitochondria, which produce the energy cells need, also worked better, with improved respiration, more ATP (the body’s energy currency), and greater glucose uptake in the muscle cells.
Beyond the main muscle and blood sugar effects, the study found that the compounds improved mitochondrial biogenesis, which means the cells made more new mitochondria. This is important because weaker or fewer mitochondria are often seen in muscles affected by obesity and aging. Better energy production may help muscles recover and perform well.
The analysis of gene activity and the CMap database tool suggested that the protein PSMB1 might play a key role in how the compounds work. PSMB1 is part of the cell’s protein recycling machinery. This is a suggestion from computer-based analysis, not a confirmed finding, so it should be treated as a lead for future research rather than an established mechanism.
The authors describe both compounds as having anti-inflammatory and insulin-sensitizing properties, which suggests that this study builds on earlier work showing that these plant compounds can affect metabolism and inflammation. Previous research on related compounds has often focused on the liver, fat tissue, or general metabolism. This study adds evidence specifically about skeletal muscle, the tissue that makes up most of your body’s movement and strength.
The study’s direct comparison of the two compounds is also useful. Oleanolic acid and ursolic acid are chemically similar, so it is helpful to see that both produce comparable effects in this model. Still, the summary does not indicate whether one was clearly more effective than the other, so the reader should not assume either is superior.
The most important limitation is that the study was done in mice and in cultured cells, not in people. Mice are useful models for obesity research, but human muscle, diet, and metabolism are different in important ways. The results cannot yet tell us whether these compounds would prevent or reverse muscle loss in people.
Another limitation is that the summary does not report the number of animals or experiments, or how the amount of each compound given to the mice compares with what people could realistically get from food. Without these details, it is hard to judge the size of the effects or whether they would be practical in everyday life.
Finally, the PSMB1 finding came from computer-based pattern analysis and was described as a potential target. This means it has not yet been confirmed by direct experiments in the study, and it should be considered a starting point for future research.
The Bottom Line
Confidence is low for any direct recommendation about these compounds for muscle health in people, since the evidence comes only from mice and cell cultures. Research of this kind suggests that oleanolic acid and ursolic acid deserve further study in humans (moderate confidence that further research is worthwhile). Based on current knowledge, people who want to protect muscle during weight changes should focus on strength training, adequate protein intake, and a diet rich in whole foods (high confidence that these habits support muscle health). Supplement use should be discussed with a healthcare provider first.
People with obesity, insulin resistance, or prediabetes, along with researchers and clinicians who study muscle loss and metabolic health, may find this research especially relevant. Older adults concerned about muscle loss may also be interested in future human trials. People who are pregnant, taking medications, managing a chronic condition, or considering supplements should speak with a doctor before making any changes based on this research. Those looking for proven steps today should focus on established habits rather than waiting for these compounds.
Human trials usually take years to design, run, and analyze, so it may be a long time before doctors know whether these compounds help people. Even after promising human studies, it can take several more years before any recommendation becomes standard care. In the meantime, the habits known to protect muscle, such as regular strength training and adequate protein, can produce noticeable changes in a matter of weeks to months.
Frequently Asked Questions
Can oleanolic acid and ursolic acid prevent muscle loss from obesity?
Research in high-fat diet-fed mice found that both compounds reduced muscle atrophy and improved blood sugar control. These results come from animal and cell studies, so human benefits have not been proven yet. Anyone concerned about muscle loss should talk with a healthcare provider.
Which foods contain oleanolic acid and ursolic acid?
Oleanolic acid and ursolic acid are plant compounds found in foods such as apple peels, olives, and herbs like rosemary. Eating a varied diet with many fruits, vegetables, and herbs is a practical way to include them. The amounts in food are generally smaller than those used in lab studies.
How does ursolic acid affect muscle cells according to recent research?
A 2026 study reported that ursolic acid appeared to activate the IRS/AKT/mTOR pathway, which supports muscle protein maintenance. It also reduced signals that drive muscle breakdown and improved mitochondrial energy production in muscle cells grown in lab dishes.
Is strength training more proven than plant compounds for protecting muscle?
Yes, strength training has much stronger evidence in people for maintaining muscle mass. Regular resistance exercise, combined with adequate protein intake, is well established for protecting muscle. Plant compounds like oleanolic and ursolic acid currently have only early animal and cell evidence supporting them.
Want to Apply This Research?
- Track a weekly strength measure, such as the number of push-ups or squats you can complete with good form, and record it in the app. Pair this with weekly protein intake in grams, logged daily, so you can see whether your strength is changing alongside your nutrition habits.
- Set a daily protein target that fits your needs, and spread it across meals rather than eating most of it at dinner. Schedule two or three strength sessions per week, and use the app to log each one. Focus on whole foods that contain these plant compounds, such as olives, apples with the peel, and herbs like rosemary, as part of a varied diet rather than relying on any single food.
- Over the long term, review your app data monthly to look for trends in strength, body composition, waist measurements, and energy levels. Share these trends with your healthcare provider at regular checkups, especially if you have blood sugar concerns. Keep an eye on new research in this area, and update your approach if human studies confirm these findings in the future.
This article summarizes a laboratory study conducted in mice and cultured muscle cells, not in humans. The findings are early and should not be used to diagnose, treat, or prevent any condition. Do not start, stop, or change supplements, medications, or diet based on this research without consulting a qualified healthcare provider. Individual needs vary, and anyone with obesity, blood sugar concerns, or muscle problems should seek personalized medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.