A 2026 genetic analysis study found that herbal tea, beer, pancakes, and salads appeared to lower rectal cancer risk, while spirits intake showed increased risk. According to Gram Research analysis, these associations were identified using genetic markers from 706 DNA variations in the UK Biobank. However, researchers emphasize these preliminary findings need confirmation in other populations before recommending dietary changes specifically for cancer prevention.
Researchers used a special genetic analysis method to study whether eating certain foods affects rectal cancer risk. They looked at data from over 700 genetic markers in a large UK database and found that five dietary habits showed connections to rectal cancer. Eating herbal tea, drinking moderate amounts of beer, eating pancakes, and eating salads appeared protective, while drinking spirits showed a potential increased risk. The researchers emphasize these findings need more testing before doctors recommend specific diets to prevent rectal cancer.
Key Statistics
A 2026 genetic study of 706 DNA markers from the UK Biobank found that herbal tea intake was associated with a protective effect against rectal cancer, with an odds ratio of 0.998 (95% CI: 0.997-0.999).
According to the 2026 research, spirits consumption showed a potential increased rectal cancer risk with an odds ratio of 1.261 (95% CI: 1.010-1.575), representing approximately 26% higher risk in the genetic analysis.
The 2026 study found that salad and raw vegetable intake was associated with approximately 19% lower rectal cancer risk (odds ratio 0.809, 95% CI: 0.655-0.999) in the genetic analysis of UK Biobank data.
Beer and cider consumption showed a protective association with rectal cancer in the 2026 genetic study, with an odds ratio of 0.867 (95% CI: 0.757-0.992), representing approximately 13% lower risk.
The Quick Take
- What they studied: Whether specific foods and drinks we eat are genetically linked to developing rectal cancer
- Who participated: The study analyzed genetic data from 706 genetic markers collected from the UK Biobank, a large database of health information from hundreds of thousands of people
- Key finding: Five dietary habits showed connections to rectal cancer risk: herbal tea, beer, pancakes, and salads appeared protective, while spirits intake appeared to increase risk
- What it means for you: While these findings are interesting, they are preliminary and need confirmation in other populations before changing your diet specifically to prevent rectal cancer. Talk to your doctor about proven cancer prevention strategies
The Research Details
This study used a method called Mendelian randomization, which is a special type of genetic analysis. Instead of following people over time and asking what they eat, researchers used genetic information to study whether certain foods are connected to cancer risk. The researchers identified 706 genetic markers (tiny variations in DNA) that relate to dietary habits from the UK Biobank, a massive health database. They then checked whether these genetic markers were also connected to rectal cancer. This approach is like using genetic code as a natural experiment to understand cause and effect, rather than relying on people’s memories of what they ate.
The researchers were very careful about which genetic markers they used. They filtered out weak markers, checked for genetic interference (when one genetic change affects multiple traits), and ran multiple sensitivity tests to make sure their results were reliable. They used advanced statistical methods with names like Steiger filtering and MR-PRESSO to catch any problems in their analysis.
This type of study is valuable because it avoids some problems with traditional diet studies, where people often forget what they ate or change their habits after getting sick. Genetic information doesn’t change over time, making it a more objective way to study these connections.
Most previous studies about diet and rectal cancer relied on people remembering what they ate, which is often inaccurate. This genetic approach provides a different kind of evidence that may be more reliable. However, the researchers themselves note these findings are preliminary and need confirmation in other groups of people before doctors should recommend specific diets based on this research.
The study used rigorous statistical methods and multiple checks to ensure the results were solid. However, the findings are associations (connections) rather than proof of cause and effect. The study was conducted in a UK population, so results may not apply equally to other ethnic groups or countries. The researchers themselves recommend these findings be validated in independent studies before using them for health recommendations.
What the Results Show
The analysis found five dietary habits with statistical connections to rectal cancer risk. Herbal tea intake showed a protective effect, with each additional cup associated with a small reduction in cancer risk (odds ratio 0.998, meaning 0.2% lower risk per cup). Beer and cider consumption also appeared protective, with regular drinkers showing about 13% lower risk compared to non-drinkers. Pancake consumption was associated with about 25% lower risk, and eating salads or raw vegetables showed about 19% lower risk.
On the other side, spirits consumption appeared to increase risk. People who drank spirits regularly showed about 26% higher rectal cancer risk compared to those who didn’t drink spirits. The researchers emphasize that these are statistical associations found in genetic data, not definitive proof that these foods cause changes in cancer risk.
All of these findings came from analyzing genetic markers rather than studying people’s actual eating habits. This means the researchers were looking at genetic predispositions related to food preferences, not necessarily measuring what people actually ate. The protective effects were modest in size, and the researchers note that many of these associations were just barely statistically significant.
The study examined many other dietary habits but only reported the five that showed statistical significance. This means many foods and drinks tested did not show clear connections to rectal cancer risk. The researchers used multiple statistical methods to check their findings, and the results held up across different analytical approaches, suggesting the associations are not due to statistical errors.
Previous studies have suggested that diet affects rectal cancer risk, but those studies often relied on people remembering what they ate, which is unreliable. This genetic approach provides independent evidence that certain dietary preferences may be connected to cancer risk. However, the specific foods identified here (herbal tea, beer, pancakes, salads, and spirits) have not been extensively studied in traditional diet and cancer research, so this study adds new information to the field.
The study has several important limitations. First, it uses genetic markers as a proxy for dietary habits, not actual food consumption, so the results may not reflect real-world eating patterns. Second, the study was conducted in a UK population, and results may differ in other ethnic groups or countries. Third, the associations found are modest in size and some were only barely statistically significant. Fourth, the researchers cannot prove these foods cause changes in cancer risk, only that genetic markers related to preferring these foods are connected to cancer risk. Finally, the study examined many dietary habits, which increases the chance of finding false associations by random chance.
The Bottom Line
Based on this preliminary research, there is insufficient evidence to recommend specific dietary changes solely to prevent rectal cancer. The findings are interesting but need confirmation in other populations. For cancer prevention, follow established guidelines: eat plenty of vegetables and fruits, limit processed meats, maintain a healthy weight, exercise regularly, and avoid excessive alcohol. Talk to your doctor about proven cancer prevention strategies.
People interested in cancer prevention and researchers studying diet and disease should pay attention to these findings. However, this research is not yet ready to guide individual dietary choices. People with a family history of rectal cancer should discuss proven prevention strategies with their doctor rather than relying on these preliminary findings.
If these findings are eventually confirmed and proven to be causal, any protective effects from dietary changes would likely develop over years or decades, as cancer typically takes many years to develop. Do not expect immediate health changes from modifying diet based on this single study.
Frequently Asked Questions
Does drinking herbal tea prevent rectal cancer?
A 2026 genetic study found herbal tea intake was associated with lower rectal cancer risk, but this is preliminary evidence. The association was small and needs confirmation in other populations before doctors recommend herbal tea specifically for cancer prevention.
Is it safe to drink beer and spirits for cancer prevention?
The 2026 study found beer showed protective associations while spirits showed increased risk in genetic analysis. However, excessive alcohol consumption carries other health risks. Moderate drinking guidelines from health organizations remain the safest approach.
Should I eat more salads to prevent rectal cancer?
A 2026 genetic study found salad consumption was associated with lower rectal cancer risk. Eating more vegetables is generally healthy, but this single study is not strong enough evidence to recommend salads specifically for cancer prevention.
What does Mendelian randomization actually measure?
Mendelian randomization uses genetic markers to study whether traits are connected to disease risk. It’s like using DNA as a natural experiment, but it shows associations, not definitive proof that foods cause changes in cancer risk.
Can I rely on this study to change my diet for cancer prevention?
No. The researchers themselves state these preliminary findings need validation in other populations before informing dietary recommendations. Follow established cancer prevention guidelines: eat vegetables, limit processed meats, maintain healthy weight, and exercise regularly.
Want to Apply This Research?
- Track weekly consumption of herbal tea (cups per week), beer/cider (servings per week), pancakes (servings per month), salads/raw vegetables (servings per week), and spirits (servings per week) to monitor alignment with these preliminary findings
- If interested in these findings, users could experiment with adding herbal tea to their routine, increasing salad and raw vegetable intake, and moderating spirits consumption while tracking any changes in energy or digestion
- Create a 12-week food preference tracking log noting weekly intake of the five dietary habits identified, then reassess overall diet quality and any health changes, while continuing to follow established cancer prevention guidelines
This research presents preliminary genetic associations and should not be used to make individual dietary decisions for cancer prevention. These findings require validation in independent populations before clinical recommendations can be made. Consult with your healthcare provider or a registered dietitian for personalized cancer prevention advice based on established guidelines. This study identifies associations, not proven cause-and-effect relationships. If you have concerns about rectal cancer risk or family history, discuss screening and prevention strategies with your doctor.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.