According to Gram Research analysis, a study of 635 people with different diabetes types found that plant-based diets reduced estimated 10-year heart disease risk by 6.8-8.8% specifically in people with severe autoimmune diabetes, but showed no benefit for other diabetes subtypes. This suggests that the best diet for managing diabetes heart disease risk depends on which type of diabetes you have, not a one-size-fits-all approach.
A new study of 635 people with different types of diabetes found that eating more plant-based foods may lower heart disease risk—but only for people with one specific type of diabetes called severe autoimmune diabetes. Researchers looked at three common diabetes subtypes and discovered that dietary patterns that work well for one group might not help another. This finding suggests that a one-size-fits-all approach to diabetes nutrition may not be the best strategy. The research highlights why people with diabetes should work with their doctors to find eating plans tailored to their specific diabetes type.
Key Statistics
A 2026 cross-sectional analysis of 635 German diabetes patients found that people with severe autoimmune diabetes who ate more plant-based foods had 6.8% lower estimated 10-year cardiovascular risk compared to those eating less plant-based food.
Among 635 participants in the German Diabetes Study, adherence to a healthful plant-based diet pattern was associated with 8.8% lower estimated cardiovascular risk in severe autoimmune diabetes, but this benefit was not observed in mild obesity-related or mild age-related diabetes subtypes.
A 2026 study of 635 people with recent-onset diabetes found that dietary patterns associated with heart disease risk differed significantly across diabetes subtypes (p<0.05), with plant-based diets protective only for the 39% of participants with severe autoimmune diabetes.
The Quick Take
- What they studied: Whether different eating patterns (especially plant-based diets) affect heart disease risk differently depending on what type of diabetes someone has
- Who participated: 635 people with recently diagnosed diabetes, average age 47.5 years, 60% male, from a German diabetes research study. They were divided into three groups based on their diabetes subtype: severe autoimmune diabetes (39%), mild obesity-related diabetes (31%), and mild age-related diabetes (30%)
- Key finding: People with severe autoimmune diabetes who ate more plant-based foods had about 6.8-8.8% lower estimated heart disease risk over 10 years. This benefit was not seen in the other two diabetes types
- What it means for you: If you have diabetes, the best diet for your heart health may depend on which type of diabetes you have. Talk to your doctor about your specific diabetes type before making major diet changes. This research is still early and needs more testing in real-world situations
The Research Details
Researchers used data from the German Diabetes Study, which tracks people with newly diagnosed diabetes. They combined information from people at their initial visit and at a 5-year follow-up check, creating a snapshot of 635 people at different time points. The team classified participants into three diabetes subtypes based on medical characteristics, then looked at what people ate using detailed food questionnaires. They measured heart disease risk using a standard calculator called SCORE2-Diabetes, which estimates the chance of having a heart attack or stroke in the next 10 years.
The researchers examined whether eating patterns—specifically how much plant-based food people ate and the quality of carbohydrates they consumed—were connected to heart disease risk. They used statistical methods to see if these connections were different depending on which diabetes subtype someone had. This approach allowed them to spot patterns that might be hidden if they just looked at all diabetes patients together.
This study design is important because it reveals that diabetes is not one single disease. By looking at different diabetes subtypes separately, the researchers discovered that nutrition advice that works for one group might not work for another. This finding challenges the common practice of giving all diabetes patients the same dietary recommendations
Strengths: The study used a well-established diabetes research cohort with careful classification of diabetes subtypes, and researchers adjusted their analysis for many factors that could affect results. Limitations: This was a snapshot study (cross-sectional), not a long-term follow-up, so we cannot prove that diet changes actually caused the lower heart disease risk. The study was conducted in Germany, so results may differ in other populations. The researchers estimated heart disease risk using a calculator rather than measuring actual heart attacks or strokes
What the Results Show
The most striking finding was that plant-based eating patterns were protective only for people with severe autoimmune diabetes. In this group, eating more plant-based foods was linked to a 6.8% lower estimated 10-year heart disease risk, and following a healthful plant-based diet pattern was linked to an 8.8% lower risk. These associations were statistically significant, meaning they were unlikely to be due to chance.
In contrast, people with mild obesity-related diabetes and mild age-related diabetes showed no meaningful connection between plant-based eating and heart disease risk. The differences between groups were statistically significant (p<0.05), indicating that the diabetes subtype genuinely matters for how diet affects heart health.
This pattern suggests that the biological mechanisms underlying different diabetes types may respond differently to dietary changes. Severe autoimmune diabetes involves the immune system attacking insulin-producing cells, which may create a different metabolic environment than the other subtypes, potentially making plant-based diets particularly beneficial.
The study also examined carbohydrate quality (eating whole grains and fiber-rich carbs versus refined carbs), though the detailed results for this measure were not as prominent in the findings. The overall pattern suggests that dietary interventions for diabetes should be personalized based on diabetes subtype rather than using a universal approach
Previous research has generally shown that plant-based diets help reduce heart disease risk in people with diabetes, but this study adds important nuance by showing the benefit may not apply equally to all diabetes types. Most earlier studies didn’t distinguish between diabetes subtypes, which may explain why some studies found strong benefits while others found weaker effects. This research aligns with the growing recognition that ‘diabetes’ is actually several different diseases that happen to involve high blood sugar
The study cannot prove cause-and-effect because it’s a snapshot in time rather than following people forward. People who eat plant-based diets may differ in other healthy behaviors not measured in the study. Heart disease risk was estimated using a calculator, not actual health events. The study included mostly German participants, so results may not apply to other populations. The sample size for each subtype was relatively modest, which could limit the strength of conclusions
The Bottom Line
If you have severe autoimmune diabetes, increasing plant-based foods in your diet may help reduce your heart disease risk (moderate confidence based on this single study). If you have other diabetes types, plant-based eating may still be healthy, but this study doesn’t show a specific heart disease benefit (low confidence). All people with diabetes should work with their healthcare team to develop personalized nutrition plans based on their specific diabetes type, not generic diabetes diet advice
This research is most relevant for people with newly diagnosed diabetes, especially those with severe autoimmune diabetes. Healthcare providers treating diabetes patients should consider diabetes subtype when making dietary recommendations. People with established diabetes should not make major diet changes based on this single study without consulting their doctor. This research is less immediately relevant for people without diabetes
Heart disease risk reduction from diet changes typically takes months to years to develop. The estimated 10-year risk reduction shown in this study represents long-term benefits, not immediate changes. You should expect to follow dietary recommendations for at least 3-6 months before seeing meaningful improvements in blood sugar control or other health markers
Frequently Asked Questions
Does a plant-based diet help prevent heart disease in people with diabetes?
Plant-based diets may reduce heart disease risk, but the benefit depends on your diabetes type. A 2026 study found a 6.8-8.8% risk reduction in severe autoimmune diabetes, but no benefit in other diabetes types. Talk to your doctor about your specific situation.
Are there different types of diabetes that need different diets?
Yes. Research shows diabetes has at least three common subtypes—severe autoimmune, mild obesity-related, and mild age-related—and they may respond differently to dietary changes. Your doctor can help identify your subtype and recommend appropriate nutrition strategies.
What should I eat if I have autoimmune diabetes?
If you have severe autoimmune diabetes, increasing plant-based foods like vegetables, fruits, whole grains, and legumes may help lower heart disease risk. However, work with your healthcare team to create a personalized plan that fits your specific needs and blood sugar management.
How long does it take for diet changes to reduce heart disease risk?
Heart disease risk reduction from diet typically develops over months to years. You should expect to follow dietary recommendations for at least 3-6 months before seeing meaningful improvements in blood sugar control and other health markers.
Can I use this study to change my diabetes diet on my own?
This single study provides useful information but shouldn’t guide major diet changes without medical supervision. Work with your doctor or diabetes educator to determine your diabetes subtype and develop a personalized nutrition plan based on your individual health needs.
Want to Apply This Research?
- Track daily plant-based food servings (vegetables, fruits, whole grains, legumes) and monitor estimated cardiovascular risk markers like blood pressure and cholesterol every 3 months if you have autoimmune diabetes
- If you have severe autoimmune diabetes, gradually increase plant-based foods by adding one extra vegetable serving or legume-based meal per day, while tracking how this affects your blood sugar levels and energy
- Log plant-based meal patterns weekly and correlate with quarterly cardiovascular risk assessments from your doctor. Track blood sugar responses to plant-based meals to identify which plant-based foods work best for your individual diabetes type
This research describes associations between diet and estimated heart disease risk in people with specific diabetes subtypes. It does not prove that changing your diet will prevent heart disease. The study used risk calculators rather than measuring actual heart attacks or strokes. Results are based on a German population and may not apply to all groups. Anyone with diabetes should consult their healthcare provider before making significant dietary changes. This information is for educational purposes and should not replace professional medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.