Does Food Variety Lower Diabetes Risk? 2026 Study

A new study of 16,666 Korean adults found that people who ate a wider variety of foods each day had a lower risk of developing type 2 diabetes. Published in the British Journal of Nutrition, the research points to diversity on the plate, not just the quality of any single food, as a factor in long-term metabolic health.

The finding lands at a moment when most nutrition advice fixates on cutting one thing out: less sugar, fewer carbs, no ultra-processed snacks. This study flips the lens toward what you add in. Below is what the researchers measured, why it may matter, and how to put it into practice without overthinking it.

What the 2026 study found

Researchers at Hanyang University College of Medicine tracked 16,666 adults aged 40 and older from the Korean Genome and Epidemiology Study. Over a median of six years, 953 participants developed type 2 diabetes. The team scored each person's dietary diversity across five food groups and compared diabetes rates between the most and least varied eaters.

Stat: Men with a dietary diversity score above 4 had a 44% lower risk of developing diabetes than men scoring 3 or lower. Women with the most varied diets had a 27% lower risk.

The five groups were grains; meat, fish, eggs, legumes and nuts; vegetables, seaweed and mushrooms; fruit; and milk and dairy. Participants earned one point for each group they ate at least once a day. The associations held after adjusting for age, physical activity, smoking, alcohol, BMI, fasting blood glucose and total calorie intake.

Key Takeaway: In this cohort, eating across more food groups each day was associated with a meaningfully lower risk of type 2 diabetes, independent of body weight and overall calorie intake.

Variety within a food group counted too

Diversity was not only about hitting all five groups. Eating a range of foods inside a single group was also linked to lower risk. People with the most varied dairy intake had a 31% lower diabetes risk in men and 30% in women, compared with the least varied.

Men who ate a wider range of fruits had a 30% lower risk, while women who ate more varied vegetables, seaweed and mushrooms showed a 27% lower risk. The researchers suggest this may reflect the combined effect of many nutrients and bioactive compounds working together, rather than any single "superfood."

Why variety might protect metabolic health

A varied diet tends to deliver a broader mix of fiber, vitamins, minerals and plant compounds, which some evidence links to better blood sugar control and a more diverse gut microbiome. This study is observational, so it shows an association, not proof that variety directly prevents diabetes.

It also fits a wider pattern in nutrition research: dietary quality often comes from the overall shape of what you eat, not one hero ingredient. The same logic shows up in work on whole grains and heart health and on fiber and blood sugar.

How to eat more varied without overthinking it

Aiming for variety is simpler than tracking a rigid plan. A practical target is to touch several food groups across the day and rotate the specific foods within them week to week, rather than eating the same three meals on repeat.

Rotate your proteins: alternate fish, eggs, legumes and lean meat across the week instead of defaulting to one.
Vary your plants: different colored vegetables and fruits bring different nutrients, so swap them regularly.
Mix your carbs: rotate grains like oats, barley, rice and whole wheat rather than sticking to one staple.

Key Takeaway: You do not need exotic foods to eat with more variety. Rotating ordinary items across groups and within groups is the pattern this research associates with lower risk.

Keeping a loose record of what you actually eat can reveal how repetitive a week really is. Describing meals to a context-aware chat in a few words or a photo, and reviewing the history over time, is one low-friction way to spot whether your diet is as varied as you think. The same approach helps when you are watching for nutrient gaps in plant-based swaps.

The limits of the evidence

This was a study of Korean adults aged 40 and older, so the exact numbers may not transfer to every population or age group. As an observational cohort, it cannot rule out that varied eaters differ in other healthy habits the researchers did not fully capture.

Diversity is also not a free pass. A wide variety of ultra-processed foods is not what this research rewards, and quality still matters alongside variety. The study's author stressed considering both diversity and quality, with plenty of fruits, vegetables, seaweed and mushrooms.

Sources

Eating a Wider Variety of Foods Linked to Lower Diabetes Risk in Korean Adults, Study Finds - Health Chosun, 2026
Dietary diversity and incident type 2 diabetes, British Journal of Nutrition, 2026 (Kim Mi Kyung et al., Hanyang University; Korean Genome and Epidemiology Study)

FAQ

Does eating a variety of foods lower diabetes risk?

A 2026 study of 16,666 Korean adults found that those with the most varied diets had a lower risk of type 2 diabetes, up to 44% lower in men and 27% lower in women. It is an observational association, so variety is linked to lower risk rather than proven to prevent diabetes.

What is a dietary diversity score?

A dietary diversity score counts how many different food groups you eat regularly. In this study, researchers used five groups and gave one point for each group eaten at least once a day, then compared diabetes rates across scores.

Does variety matter more than diet quality?

No, they work together. The study's author recommended considering both diversity and quality, since a varied diet full of ultra-processed foods is not the pattern linked to lower risk. Variety of minimally processed foods is the key.

How can I make my diet more varied?

Rotate the specific foods within each group week to week: alternate proteins like fish, eggs and legumes, eat different colored vegetables and fruits, and vary your grains. Reviewing what you actually logged over a week helps reveal hidden repetition.

-- Selena