By SmashMeals Editorial · Published · Updated
Mediterranean, DASH, MIND, Nordic, plant-based. Every few months a new headline crowns a winner. A large study published in October 2026 suggests the question is wrong. Ten different healthy eating patterns were all linked to slower biological aging, and most of what they do in the body overlaps. Here is what that study found, what the healthiest diets have in common, and how to eat that way without following any one plan perfectly.
This guide is general information, not medical advice.
The study
Researchers at the German Center for Neurodegenerative Diseases (DZNE) scored about 6,470 adults in the Rhineland Study against 10 dietary patterns, then repeated the analysis in 1,034 adults from the EPIC-Potsdam study. They estimated biological age from DNA methylation using three "epigenetic clocks" across about 850,000 DNA sites. The results were published in Nature Communications.
- Better adherence to every one of the 10 diets was associated with slower biological aging.
- More than 70% of the biological pathways involved were shared across all 10.
- DASH was linked to heart-related pathways and MIND to memory-related ones.
- The effects were modest in absolute terms, and the study was observational.
"Importantly, there is probably no single 'correct' diet," said Monique Breteler, who leads the Rhineland Study, according to ScienceDaily. Lead author Juliana Tavares added: "You don't need a perfect diet -- that may be the most practical message here." Read our news coverage.
What the healthy patterns share
| Diet | Emphasizes | Limits |
|---|---|---|
| Mediterranean | Vegetables, legumes, whole grains, fish, olive oil, nuts | Red and processed meat, sweets |
| DASH | Vegetables, fruit, low-fat dairy, whole grains, lean protein | Sodium, saturated fat, added sugar |
| MIND | Leafy greens, berries, beans, nuts, fish, olive oil | Butter, cheese, fried and fast food, pastries |
| Nordic | Fish, berries, root vegetables, whole grains, canola oil | Processed foods, added sugar |
| Plant-based | Vegetables, fruit, legumes, whole grains, nuts | Most animal foods |
The overlap is obvious once it is laid out: lots of vegetables, beans, whole grains, fish and healthy fats; less processed meat, sweets and fried food.
Seven habits that cover most healthy diets
- Fill half your plate with vegetables at lunch and dinner.
- Eat beans or lentils several times a week.
- Have fish twice a week. Our fish versus fish oil guide explains why food beats pills.
- Choose whole grains, including gluten-free ones like brown rice, quinoa and oats labeled gluten-free.
- Cook with olive or canola oil.
- Keep processed meats and sweets occasional.
- Snack on fruit and nuts instead of packaged snacks.
Why "good enough" works
The study's message is freeing. Few people scored as healthy eaters by every standard at once, yet better adherence to any healthy pattern moved in the right direction. That means you can pick the pattern that fits your culture, budget and health needs:
- High blood pressure? DASH has the strongest evidence.
- Worried about memory? Our MIND diet guide covers it.
- Fatty liver? See our MASLD food guide.
- Celiac disease? Every one of these patterns can be gluten-free.
Protein and aging
None of these patterns means skimping on protein. Older adults especially need enough protein to keep muscle. Our guide to healthy aging and protein after 60 explains why.
Make the pattern automatic
The hardest part of any diet is Tuesday at 6 p.m. SmashMeals cooks vegetable-forward, protein-rich meals in a dedicated gluten-free kitchen in Kingsport, Tennessee, and posts nutrition for each one. See our heart-healthy meals, compare this week's menu, or order now.
Sources
Frequently asked questions
- What is the healthiest diet?
- A 2026 study linked 10 different healthy patterns, including Mediterranean, DASH, MIND, Nordic and plant-based, with slower biological aging. The researchers said there is probably no single correct diet.
- What do healthy diets have in common?
- Plenty of vegetables, beans, whole grains, fish and healthy oils, with limited processed meat, sweets and fried food.
- Can healthy diets be gluten-free?
- Yes. Each pattern can be followed gluten-free using naturally gluten-free whole grains such as rice, quinoa and oats labeled gluten-free.