Gram Research analysis of a 9.7-year study found that eating more animal-based foods increased type 2 diabetes risk by 12% for each additional point on a dietary score, with fish showing the strongest link at 19% increased risk. A person’s genes, specifically DNA methylation patterns on the TXNIP gene, may modify how diet affects diabetes risk, suggesting that future dietary guidance should consider both food choices and genetic factors.
A Gram Research analysis of nearly 2,000 people over 9.7 years found that eating more animal-based foods like meat, fish, eggs, and milk was linked to a higher risk of developing type 2 diabetes. Interestingly, the study also discovered that a person’s genes, specifically how their TXNIP gene is marked by a process called DNA methylation, may influence whether animal foods affect their diabetes risk. This suggests that future diet advice for people at risk of diabetes might need to consider both what they eat and their genetic makeup.
Key Statistics
A cohort study of 1,942 Chinese adults followed for 9.7 years found that each one-point increase in animal food consumption was associated with a 12% higher risk of developing type 2 diabetes, with 432 new cases documented during follow-up.
Among animal-based foods studied, fish intake showed the strongest association with type 2 diabetes risk, with each unit increase linked to a 19% higher risk of developing the disease in the 1,942-participant cohort.
DNA methylation analysis of 387 participants identified two specific genetic markers on the TXNIP gene that remained significantly associated with type 2 diabetes risk even after strict statistical correction.
One genetic marker on the TXNIP gene appeared to modify the relationship between animal food consumption and diabetes risk, particularly for egg intake, suggesting that genetic factors influence how diet affects individual diabetes risk.
The Quick Take
- What they studied: Whether eating animal-based foods (meat, fish, eggs, milk) increases the risk of developing type 2 diabetes, and how a person’s genes might change this relationship.
- Who participated: 1,942 people from Beijing, China who did not have type 2 diabetes at the start of the study. Researchers followed them for about 9.7 years, from 2005 to 2025.
- Key finding: Each additional point on a scale measuring animal food consumption was linked to a 12% higher risk of developing type 2 diabetes. Fish intake showed the strongest link, with a 19% increased risk per unit increase.
- What it means for you: If you are at risk for type 2 diabetes, you may want to consider eating less animal-based food, especially fish. However, this study shows associations, not proof of cause and effect. Your genes also play a role in how diet affects your diabetes risk.
The Research Details
This was a cohort study, which means researchers followed the same group of people over time to see who developed type 2 diabetes. At the beginning, participants filled out a detailed food questionnaire about how much meat, fish, eggs, and milk they ate. Researchers scored each food type on a scale and added them together to create an overall animal food score ranging from 4 (lowest intake) to 12 (highest intake). For a smaller group of 387 participants, scientists also measured DNA methylation, which is a chemical tag that sits on genes and can turn them on or off without changing the DNA itself. This tag on the TXNIP gene was studied because it may be involved in diabetes development.
Following people over many years gives researchers a clearer picture of how diet affects disease risk compared to just asking people about their habits once. By measuring both diet and genetic markers, this study helps explain why the same diet affects different people differently. Understanding these gene-diet interactions could lead to more personalized nutrition advice.
This study has several strengths: it followed nearly 2,000 people for almost a decade, used detailed dietary questionnaires, and measured actual genetic markers rather than just guessing. However, the DNA methylation analysis included only 387 people, which is much smaller. The study was conducted in one region of China, so results may not apply equally to other populations. People who stayed in the study through follow-up may have been healthier than those who dropped out, which could affect results.
What the Results Show
During the 9.7-year follow-up period, 432 of the 1,942 participants developed type 2 diabetes. The study found that people who ate more animal-based foods had higher diabetes risk. Specifically, each one-point increase in the animal food score (out of a possible 12-point scale) was associated with a 12% higher risk of developing diabetes. This relationship was statistically significant, meaning it was unlikely to happen by chance. Among the individual foods studied, fish showed the strongest association: each unit increase in fish consumption was linked to a 19% higher diabetes risk. Meat, eggs, and milk also showed increased risk, though the effect was less pronounced than fish.
The DNA methylation analysis identified two specific locations on the TXNIP gene (cg19693031 and cg26974062) that were significantly associated with type 2 diabetes risk. These genetic markers remained important even after applying strict statistical corrections. The study also found that one of these genetic markers (cg19693031) appeared to modify how animal foods affected diabetes risk, particularly for eggs. However, when researchers divided people into groups based on their methylation levels, the relationship between animal foods and diabetes risk disappeared in both groups, suggesting the interaction is complex and may not be straightforward.
Previous research has shown mixed results about animal food consumption and diabetes risk. Some studies found that red meat increases diabetes risk while fish may be protective, but this study found fish was associated with higher risk. The finding that genetic factors modify diet-disease relationships aligns with growing evidence that personalized nutrition based on genetics may be important. This study adds to the emerging field of nutrigenomics, which studies how genes and nutrition interact.
The study was conducted in one region of Beijing, so results may not apply to other populations with different genetics or food cultures. The DNA methylation analysis included only 387 of the 1,942 participants, making it harder to draw firm conclusions about gene-diet interactions. The study measured diet at only one point in time, so researchers could not track how diet changes affected diabetes risk. People were asked to recall their food intake, which can be inaccurate. The study shows associations but cannot prove that animal foods directly cause diabetes, since other factors could explain the relationship.
The Bottom Line
If you are at risk for type 2 diabetes, consider reducing your intake of animal-based foods, particularly fish and other animal proteins. This recommendation has moderate confidence based on this study, though it should be combined with other proven strategies like maintaining a healthy weight, exercising regularly, and managing blood sugar. Consult with a healthcare provider or registered dietitian before making major dietary changes, especially if you have a family history of diabetes.
This research is most relevant for people with a family history of type 2 diabetes, those who are overweight, and people over age 45. It may be less relevant for people with no diabetes risk factors. The study was conducted in a Chinese population, so results may apply most directly to people of East Asian descent, though the general principles may apply more broadly.
Changes in diabetes risk from dietary modifications typically take weeks to months to show up in blood sugar levels, and years to significantly reduce the risk of developing type 2 diabetes. You may notice improvements in energy levels and weight within a few weeks of reducing animal food intake, but the full protective benefit against diabetes develops over months to years.
Frequently Asked Questions
Does eating fish increase type 2 diabetes risk?
According to a 2026 cohort study of 1,942 people, fish consumption was associated with a 19% higher risk of type 2 diabetes per unit increase. However, this shows association, not definitive cause. Other factors and individual genetics also influence risk.
Can my genes affect how diet impacts my diabetes risk?
Research shows that DNA methylation patterns on the TXNIP gene may modify how animal foods affect diabetes risk. This means the same diet could have different effects on different people based on their genetic markers, supporting personalized nutrition approaches.
Should I stop eating animal-based foods to prevent type 2 diabetes?
This study suggests reducing animal food intake may lower diabetes risk, but complete elimination is not necessary. Work with a healthcare provider to develop a balanced diet that reduces your personal risk factors while meeting your nutritional needs.
How long does it take to see diabetes risk reduction from dietary changes?
Blood sugar improvements may appear within weeks, but significant reduction in type 2 diabetes risk typically takes months to years of consistent dietary changes. Combined with exercise and weight management, benefits accumulate over time.
Does this study apply to people outside of China?
The study was conducted in Beijing, so results may apply most directly to East Asian populations. However, the general principle that animal food consumption affects diabetes risk likely applies more broadly, though individual effects may vary by population.
Want to Apply This Research?
- Log your daily servings of animal-based foods (meat, fish, eggs, milk) and track your weight and energy levels weekly. Set a goal to reduce your animal food score by 1 to 2 points per week.
- Replace one animal-based protein source per day with plant-based alternatives like beans, lentils, tofu, or nuts. For example, swap fish for a legume-based meal twice per week, or replace eggs with oatmeal for breakfast.
- Track your animal food intake using a food diary within the app, monitor your weight monthly, and note any changes in energy levels or blood sugar readings if you have access to them. Review your progress every 4 weeks and adjust your goals based on how you feel and any health metrics you can measure.
This research shows associations between animal food consumption and type 2 diabetes risk but does not prove direct causation. Results are based on a Chinese population and may not apply equally to all groups. This article is for educational purposes only and should not replace professional medical advice. Before making significant dietary changes, especially if you have diabetes, are at risk for diabetes, or take medications, consult with your healthcare provider or a registered dietitian. Individual responses to dietary changes vary based on genetics, lifestyle, and other health factors.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.