According to Gram Research analysis, not all ultra-processed foods equally increase diabetes risk. A 2026 systematic review of six studies involving 635,332 people found that sugary drinks and processed meat significantly raised diabetes risk, while some processed dairy products and sweets showed lower risk. This suggests that blanket warnings against all ultra-processed foods may be too broad and could mask which specific foods actually matter for diabetes prevention.
A new study challenges the idea that all ultra-processed foods are equally bad for your health. Researchers reviewed six major studies involving over 635,000 people and found that different types of processed foods affect diabetes risk in different ways. Some processed foods like certain dairy products and sweets were actually linked to lower diabetes risk, while others like sugary drinks and processed meat increased it. The findings suggest that grouping all processed foods together might not be the best way to make health recommendations.
Key Statistics
A 2026 systematic review published in BMC Medicine analyzed six cohort studies involving 635,332 participants followed for 6 to 26 years and found that different types of ultra-processed foods showed opposite associations with type 2 diabetes risk.
In a post-hoc analysis of 52,201 Danish adults, researchers found that sugary drinks, processed meat, red meat, and refined grains together were positively associated with type 2 diabetes, while vegetable consumption showed a protective effect.
The systematic review identified eight subtypes of ultra-processed foods, with ready-to-eat dishes, meat-based products, and sweetened beverages consistently linked to higher diabetes risk, while processed dairy products and sweets showed inverse associations across studies.
The Quick Take
- What they studied: Whether all ultra-processed foods affect type 2 diabetes risk equally, or if some types are worse than others
- Who participated: Over 635,000 adults from six different long-term studies who didn’t have diabetes at the start, followed for 6 to 26 years
- Key finding: Different types of processed foods showed opposite effects: sugary drinks and processed meat increased diabetes risk, while some dairy products and sweets actually showed lower risk
- What it means for you: Simply avoiding all ‘ultra-processed foods’ might not be the right approach. Instead, focus on limiting specific problem foods like sugary drinks and processed meat while understanding that not all processed foods carry the same risk
The Research Details
Researchers conducted a systematic review, which means they searched through scientific databases to find all high-quality studies on ultra-processed foods and diabetes. They found six major studies that followed large groups of people over many years, tracking what they ate and whether they developed diabetes. They also analyzed data from over 52,000 people in a Danish study to test their ideas about how we categorize foods.
The researchers divided ultra-processed foods into eight different categories: ready-to-eat dishes, meat-based products, sugary and artificially sweetened drinks, dairy products, sweets and snacks, refined grains, vegetables, and other items. This detailed breakdown allowed them to see if some types of processed foods were more harmful than others.
They also created a test group of five foods known to increase diabetes risk (sugary drinks, processed meat, red meat, refined grains, and vegetables) to see what happened when they looked at these foods together versus separately.
This approach matters because current health advice often tells people to avoid all ‘ultra-processed foods’ as a single category. But if different types of processed foods have opposite effects on health, then a blanket warning might not be helpful and could even be misleading. Understanding which specific foods are actually problematic helps people make better choices.
The researchers found that most of the studies they reviewed had moderate to high risk of bias, meaning there were some concerns about how reliable the results were. However, the large number of participants (over 635,000) and long follow-up periods (up to 26 years) make the overall findings more trustworthy. The fact that different studies showed similar patterns for certain foods strengthens the conclusions.
What the Results Show
The research revealed surprising differences between types of processed foods. Ready-to-eat dishes, processed meat products, and sugary or artificially sweetened drinks were consistently linked to higher diabetes risk across multiple studies. However, processed dairy products and sweets or snacks showed the opposite pattern—people who ate more of these had lower diabetes risk, though the results varied somewhat between studies.
When researchers looked at the Danish cohort of over 52,000 people, they found that the five foods most associated with diabetes (sugary drinks, processed meat, red meat, refined grains, and vegetables) together showed a clear link to diabetes risk. Interestingly, vegetables showed a protective effect, meaning people who ate more vegetables had lower diabetes risk.
The key insight is that when these different foods were grouped together as ‘ultra-processed foods,’ the individual associations became unclear. Some foods were pulling the results in one direction while others pulled in the opposite direction, creating a confusing overall picture.
The study found that the strength of associations varied considerably between different studies, suggesting that factors like study design, population characteristics, and how foods were measured all influence the results. The researchers noted that many studies didn’t clearly define what they meant by ‘ultra-processed foods,’ which made it harder to compare results across different research groups.
Previous research has generally shown that ultra-processed foods increase disease risk, but this study adds important nuance by showing that the category is too broad. Earlier work often treated all processed foods the same way, but this research demonstrates that some processed foods may actually be neutral or even beneficial. This finding aligns with growing recognition in nutrition science that food categories need to be more specific to be useful for health recommendations.
The main limitation is that most of the studies reviewed had moderate to high risk of bias, meaning the results might not be perfectly accurate. Additionally, the studies measured what people ate in different ways, making direct comparisons difficult. The research is also observational, meaning it shows associations but cannot prove that specific foods cause diabetes—people who eat more processed meat might also have other unhealthy habits. Finally, the results may not apply equally to all populations, as most studies included European participants.
The Bottom Line
Instead of avoiding all ultra-processed foods, focus on limiting specific items: sugary drinks, processed meat, and refined grains. These show the strongest links to diabetes risk. Don’t worry as much about processed dairy products or sweets in moderation. Eat plenty of vegetables and whole foods. Confidence level: Moderate to High for limiting sugary drinks and processed meat; Lower for other processed foods due to study limitations.
Anyone concerned about diabetes prevention should pay attention to this research, especially people with family history of diabetes or those at higher risk. People following strict ’no ultra-processed foods’ diets might benefit from understanding that some processed foods are less problematic than others. Healthcare providers and policymakers should consider these findings when making food recommendations.
Changes in diabetes risk from dietary changes typically take months to years to become apparent. You might notice improvements in blood sugar levels and energy within weeks, but meaningful reductions in diabetes risk usually require sustained changes over 6-12 months or longer.
Frequently Asked Questions
Are all ultra-processed foods bad for diabetes prevention?
No. A 2026 review of 635,000+ people found that sugary drinks and processed meat increase diabetes risk, but some processed dairy and sweets showed lower risk. Grouping all processed foods together masks these important differences.
Which ultra-processed foods should I avoid to prevent type 2 diabetes?
Focus on limiting sugary drinks, processed meat, red meat, and refined grains—these showed the strongest links to diabetes in research. Vegetables and some processed dairy products appear less problematic or even protective.
Can I eat processed foods if I’m trying to prevent diabetes?
Yes, but choose carefully. The research shows that not all processed foods carry equal risk. Avoid sugary drinks and processed meat, but processed dairy products appear relatively safe. Whole foods remain the best choice overall.
How long does it take to see diabetes risk reduction from dietary changes?
Blood sugar improvements may appear within weeks, but meaningful reductions in diabetes risk typically require sustained dietary changes over 6-12 months or longer based on the long-term studies reviewed.
Why do some processed foods seem protective against diabetes?
The study found inverse associations for some processed dairy and sweets, but researchers note this may reflect study limitations or confounding factors. More research is needed to understand these unexpected findings.
Want to Apply This Research?
- Track daily intake of the five highest-risk foods (sugary drinks, processed meat, red meat, refined grains, and vegetables separately). Log servings and note blood sugar readings if available to see personal patterns.
- Replace one sugary drink per day with water or unsweetened beverages, and add one extra serving of vegetables to one meal daily. These two changes target the foods with the strongest evidence for diabetes risk reduction.
- Weekly review of processed meat and sugary drink consumption trends, with monthly checks on vegetable intake and any available blood sugar or weight measurements. Track energy levels and hunger patterns to ensure changes are sustainable.
This research shows associations between certain foods and diabetes risk but does not prove cause-and-effect relationships. Individual responses to dietary changes vary based on genetics, overall lifestyle, and other health factors. Anyone with diabetes or at high risk should consult with a healthcare provider or registered dietitian before making significant dietary changes. This article 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.