By Lew Kizer — 2026-10-24 — Health & Nutrition
The short answer
A study from the German Center for Neurodegenerative Diseases (DZNE), published in Nature Communications in October 2026, scored about 7,500 adults in two German cohorts against 10 dietary patterns and estimated biological age with three epigenetic clocks. Better adherence to every one of the 10 diets, including Mediterranean, Nordic, plant-based, DASH and MIND, was associated with slower biological aging. Absolute differences were relatively small.
Key facts
- 6,470 participants in the Rhineland Study plus 1,034 in EPIC-Potsdam for replication.
- Biological age estimated from DNA methylation across about 850,000 sites.
- All 10 dietary patterns were linked with slower aging.
- More than 70% of affected biological pathways were shared across diets.
- The diet-aging link was stronger in smokers.
- Observational; effects described as modest.
KINGSPORT, Tenn., Oct. 24, 2026 — Mediterranean or Nordic? DASH or MIND? A large study suggests it matters less than the diet arguments online would have you believe.
This article reports research news and is not medical advice. Talk with your clinician before changing your diet, supplements or medicines.
What the researchers did
Scientists at the German Center for Neurodegenerative Diseases scored about 6,470 people in Bonn's Rhineland Study against 10 dietary patterns and estimated their biological age from DNA methylation, then repeated the analysis in 1,034 people from the EPIC-Potsdam study.
| Diet named in the study | Known for |
|---|---|
| Mediterranean | Olive oil, fish, vegetables, legumes |
| Nordic | Fish, berries, whole grains, root vegetables |
| Plant-based | Mostly plant foods |
| DASH | Lowering blood pressure |
| MIND | Brain health |
“Importantly, there is probably no single 'correct' diet.” — Monique Breteler, DZNE
Modest but measurable
Better adherence to every diet was linked with slower aging, and more than 70% of the biological pathways involved were shared. Lead author Juliana Tavares said: “You don't need a perfect diet -- that may be the most practical message here.” The effects were small in absolute terms and the study cannot prove cause.
Our guide, no single best diet, pulls out what the healthiest patterns share.
“There's never a question. There's never a worry. We want people to have good, delicious, nutritious, macro-counted food — and none of the guesswork.” — Lew Kizer, Founder, SmashMeals
Commentary, not medical advice
The SmashMeals perspective
This is the most encouraging nutrition finding of the month because it takes pressure off. You do not need the perfect diet or the trendiest one. Ten different healthy patterns pointed the same way, and what they share is simple: more vegetables, beans, whole grains, fish and lean protein, and less of the heavily processed stuff. That is how we try to cook.
Frequently asked questions
What is the best diet for slowing aging?
In the 2026 DZNE study, all 10 dietary patterns studied, including Mediterranean, Nordic, plant-based, DASH and MIND, were linked with slower biological aging. The lead researcher said there is probably no single correct diet.
How was biological aging measured?
Researchers used three epigenetic clocks based on DNA methylation at about 850,000 sites.
Does this prove diet slows aging?
No. The study was observational and the absolute differences were small, but the pattern held in a second, independent group.
Sources and credits
Follow the original sources for context and verification. A reference is not an endorsement of SmashMeals.
- Scientists find 10 different diets linked to slower aging (opens in a new tab)
ScienceDaily (DZNE)
Why it matters: Summary and researcher quotes.
- Associations between diet quality, epigenetic aging and epigenome in two population-based cohorts (DOI 10.1038/s41467-026-77064-4) (opens in a new tab)
Nature Communications
Why it matters: The peer-reviewed study.