Research shows that practicing yoga for three months before weight loss surgery significantly reduced stress hormones in people with severe obesity, suggesting yoga may calm the nervous system during a demanding time. However, a 2026 study of 40 patients found that yoga did not change inflammation-related genes as expected, indicating that longer practice or larger studies may be needed to detect genetic changes. Yoga appears safe and feasible as a pre-surgery preparation tool, though more research is required to confirm all benefits.
Researchers studied whether yoga could help people with severe obesity prepare for weight loss surgery by changing how their genes work. According to Gram Research analysis, 40 patients either attended yoga classes or didn’t for three months before surgery. The yoga group showed lower stress hormone levels, which suggests their bodies were calmer during a stressful time. However, the study didn’t find changes in the specific genes related to inflammation that researchers were looking for. The findings suggest yoga might be helpful as an add-on treatment, but larger studies are needed to confirm these benefits.
Key Statistics
A 2026 cohort study of 40 patients with severe obesity found that those who attended 26 yoga sessions over three months had significantly lower stress hormone levels (noradrenaline) compared to a control group, with an adjusted difference of 206.92 units.
In the same study, 72.5% of yoga participants completed their assigned sessions over three months, demonstrating that structured yoga is feasible for people preparing for bariatric surgery.
The 2026 research found no significant changes in DNA methylation of three inflammation-related genes (TNF-alpha, IL-6, and CRP) after three months of yoga, suggesting that measurable genetic changes may require longer intervention periods or larger sample sizes.
The Quick Take
- What they studied: Whether practicing yoga for three months before weight loss surgery could reduce inflammation in the body by changing how genes are expressed, and whether it improved physical and mental health.
- Who participated: 40 adults with severe obesity who were scheduled for bariatric surgery. Half did yoga classes (20 people), and half didn’t (20 people). The yoga group attended an average of 26 out of 36 sessions over three months.
- Key finding: The yoga group had significantly lower stress hormone levels (noradrenaline) compared to the control group after three months. However, the study did not find changes in inflammation-related genes that researchers expected to see.
- What it means for you: Yoga appears safe and may help calm your nervous system before major surgery, but it’s not yet proven to change how your genes work related to inflammation. Talk to your doctor about whether yoga could be part of your pre-surgery preparation.
The Research Details
This was an observational cohort study, which means researchers followed two groups of people over time without randomly assigning them to groups. One group chose to do yoga, and the other group didn’t. The yoga group attended structured classes called PRANA_it yoga for three months before their surgery, attending an average of 26 out of 36 sessions. Researchers measured stress hormones, inflammation markers, physical function, and psychological well-being at the start and after three months. They also looked at DNA methylation, which is a way genes can be turned up or down without changing the actual DNA code itself.
The researchers focused on three inflammation-related genes: TNF-alpha, IL-6, and CRP. These genes are involved in the body’s inflammatory response, which is often elevated in people with obesity. They used blood tests to measure both the genes themselves and the proteins they produce. This allowed them to see if yoga changed how these genes were expressed at the molecular level.
The study was designed as an exploratory investigation, meaning it was meant to test whether yoga might work before conducting larger, more rigorous studies. The researchers adjusted their results for baseline differences between groups to make the comparison fairer.
This research approach matters because it looks at both the physical symptoms of obesity (like inflammation) and the underlying genetic mechanisms that might drive those symptoms. By measuring DNA methylation, researchers can see if yoga creates changes at the cellular level, not just in how people feel or their blood test results. This is important for understanding whether yoga could be a true biological intervention or just a way to feel better psychologically.
This study has some important limitations to understand. First, it’s not a randomized controlled trial, which means people chose whether to do yoga rather than being randomly assigned. This makes it harder to know if yoga caused the changes or if people who chose yoga were already different in some way. Second, the sample size was small (only 40 people), which limits how much we can trust the results. Third, the study didn’t find the main thing it was looking for (changes in gene methylation), which suggests the study may not have been powerful enough to detect these changes. The researchers themselves note that longer yoga practice, larger groups of people, or testing different tissues might be needed to see genetic changes.
What the Results Show
The most significant finding was that the yoga group had much lower levels of noradrenaline, a stress hormone, after three months compared to the control group. This difference remained significant even after accounting for starting levels. Noradrenaline is released by the nervous system during stress, so lower levels suggest the yoga group’s bodies were in a calmer state. This is meaningful because preparing for major surgery is stressful, and a calmer nervous system could potentially help with recovery.
However, the study did not find the changes in DNA methylation that researchers expected. The three inflammation-related genes (TNF-alpha, IL-6, and CRP) did not show significant changes in how they were expressed between the yoga and control groups. This was surprising because inflammation is a key problem in obesity, and researchers hypothesized that yoga might reduce inflammation by changing how these genes work.
Physical functioning, measured by a standard health questionnaire, showed a small difference between groups in the unadjusted analysis, but this difference disappeared when researchers accounted for starting levels. Vitamin D levels showed no significant difference between groups. Psychological outcomes, including mood and quality of life measures, did not differ significantly between the yoga and control groups.
Circulating TNF-alpha protein (the actual protein produced by the gene, not the gene expression itself) did show a larger change in the yoga group compared to controls in the unadjusted analysis. However, this finding had high variability, meaning the results were inconsistent across participants. This suggests the finding may not be reliable. The yoga program was feasible and well-attended, with participants completing about 72.5% of sessions, indicating that yoga is practical for people preparing for surgery.
Previous research has shown that yoga can reduce stress hormones and improve well-being in various populations. This study adds to that evidence by showing yoga can lower noradrenaline specifically in people with severe obesity before surgery. However, the lack of epigenetic changes is somewhat surprising, as some earlier studies suggested yoga might influence gene expression. The findings suggest that if yoga does change gene expression related to inflammation, it may require longer practice periods or larger studies to detect these changes. The study’s focus on pre-surgery patients is novel, as most yoga research has not specifically examined people preparing for bariatric surgery.
The study has several important limitations. The non-randomized design means people chose to do yoga, so they may have been different from the control group in ways that affected the results. The small sample size (40 people) limits how confident we can be in the findings. The study did not find changes in the main outcome it was measuring (gene methylation), which raises questions about whether the study was designed correctly or whether longer intervention is needed. The researchers only measured blood samples, not tissue samples from other parts of the body, which might show different results. The study was relatively short (three months), and longer-term effects are unknown. Finally, the study did not include a true control group that received a different intervention, so we can’t compare yoga to other treatments.
The Bottom Line
If you’re preparing for weight loss surgery, yoga appears to be a safe and potentially helpful addition to your pre-surgery preparation. The evidence for stress reduction is moderate, while evidence for changing inflammation-related genes is currently weak. Talk to your surgical team about whether yoga fits into your preparation plan. Aim for regular practice (the study group attended about 26 sessions over three months) rather than occasional classes. Confidence level: Moderate for stress reduction benefits; Low for gene expression changes.
This research is most relevant to people with severe obesity who are scheduled for bariatric surgery and want to optimize their preparation. It may also interest people with obesity who want to reduce stress and inflammation, though the evidence is still developing. This research is less relevant to people with mild to moderate obesity or those not planning surgery. People with certain medical conditions should check with their doctor before starting yoga.
The study measured changes over three months, and that’s when the stress hormone reduction appeared. You may notice psychological benefits (feeling calmer, sleeping better) within weeks, but measurable changes in stress hormones and inflammation markers may take several weeks to months. Long-term effects beyond three months are unknown.
Frequently Asked Questions
Does yoga change your genes if you have obesity?
A 2026 study found that three months of yoga did not significantly change inflammation-related genes in people with severe obesity preparing for surgery. Researchers suggest longer practice, larger groups, or different testing methods may be needed to detect genetic changes.
Can yoga help reduce stress before weight loss surgery?
Yes, research shows yoga significantly reduced stress hormones in 20 patients over three months before surgery. The yoga group had much lower noradrenaline levels, suggesting their nervous systems were calmer during this stressful period.
How often should I do yoga before bariatric surgery?
The study participants attended an average of 26 yoga sessions over three months, roughly twice per week. This frequency appeared effective for reducing stress hormones and was feasible for most participants.
Is yoga safe for people with severe obesity?
Yes, the study found yoga to be safe and well-tolerated in people with severe obesity preparing for surgery. About 72.5% of participants completed their sessions, indicating good safety and tolerability.
Will yoga reduce inflammation in my body?
The study did not find that yoga reduced inflammation-related genes after three months. While yoga reduced stress hormones, which may indirectly help with inflammation, more research is needed to confirm whether yoga directly reduces inflammation markers.
Want to Apply This Research?
- Track your yoga attendance and stress levels. Log each yoga session completed and rate your stress level on a scale of 1 to 10 before and after practice. Monitor this weekly to see if regular practice correlates with lower stress ratings over time.
- Commit to attending structured yoga classes at least twice per week for eight weeks. Set reminders for class times and track attendance in your app. Note any changes in how you feel during stressful moments or before medical appointments.
- Create a dashboard showing your yoga attendance rate, average stress scores, and any physical changes you notice (sleep quality, energy levels, pain). Compare your stress levels before and after starting yoga to see if there’s a pattern. Share this data with your healthcare provider during pre-surgery consultations.
This research is exploratory and based on a small study without random assignment of participants. The findings suggest yoga may help reduce stress before weight loss surgery, but do not prove that yoga causes these changes. The study did not find changes in inflammation-related genes as expected. Before starting any new exercise program, especially if you have severe obesity or are preparing for surgery, consult with your doctor or surgical team. This information is not a substitute for medical advice, diagnosis, or treatment. Individual results may vary, and what works for one person may not work for another.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.