News · Heart & Metabolic
Mediterranean living tracked half the heart deaths in adults with type 2 diabetes
The Mediterranean diet is sold as a shopping list. This index scored the rest of it too, including naps and eating with other people, and all three parts of the score pulled in the same direction.
- The highest scorers had about half the heart-related deaths of the lowest.
- Serious heart events and deaths from any cause were both about a quarter lower.
- The score covers food, how it is eaten, and sleep, activity and company.
- All three parts contributed, so this is not a diet finding alone.
- 3,612 British adults who already had type 2 diabetes, followed for over a decade.
Everything sold under the Mediterranean label is a food. Olive oil, oily fish, tomatoes, a shelf of supplements claiming some connection to a coastline.
The people the research was originally built on were not doing a diet. They were eating particular things in a particular way, at particular times, usually with other people, in lives that also involved walking places and sleeping in the afternoon. Almost none of that survives translation into a shopping list.
Writing in EClinicalMedicine, researchers scored the whole of it. Among 3,612 individuals aged 40-70 who already had type 2 diabetes, higher adherence to the MEDLIFE was associated with stepwise decreases in serious heart events and in dying.
What the score actually counts
The MEDLIFE consisted of 25 items, organized into three blocks, and the second and third are the ones that make it unusual.
Block one is the familiar part, covering Mediterranean food consumption: vegetables, fruit, olive oil, fish, the rest of the list.
Block two is about habits rather than ingredients. Whether meals are structured, whether snacking fills the gaps, whether food is prepared rather than bought finished.
Block three is the one no supplement can package: physical activity, rest, social habits and conviviality. Moving during the day, sleeping adequately, napping, and eating in company rather than alone.
What happened over a decade
Everyone in the study had type 2 diabetes at recruitment, a condition in which your blood glucose levels are too high and which raises the risk of heart disease substantially.
After a median follow-up of 10.5-12.1 years, serious heart events had occurred in 737 people, a fifth of the group. Another 645 had died from any cause and 171 from heart or blood vessel disease.
Set the top quarter of scorers against the bottom quarter and the differences were large. Serious heart events were about 27% lower and deaths from any cause about 26% lower. Deaths specifically from heart and vessel disease were roughly halved.
Why the stepwise part matters
The comparison of highest against lowest is the eye-catching number and the weakest form of the evidence. Any two groups at opposite ends of a lifestyle score differ in a hundred ways.
The finding worth more is that risk fell in steps as scores rose, across the whole range rather than only at the extremes. A gradient like that is harder to produce by accident than a single high-versus-low gap, and it is one of the standard reasons for taking an observational result seriously.
The result that argues against a diet-only reading
Each MEDLIFE block contributed to the observed associations. That single sentence is the study’s most useful output.
If only the food block had carried the association, this would be one more Mediterranean diet paper. Instead the habits block and the activity-rest-company block each pulled in the same direction independently.
Which supports something the diet framing loses. The original evidence came from populations whose eating was embedded in a way of living, and stripping the food out of that context may strip out part of what was working.
What a cohort like this cannot rule out
People who score highly on an index like this are not a random sample. They tend to be wealthier, better educated, less likely to be doing shift work or to be too unwell to move much, and every one of those independently predicts surviving longer with diabetes.
The analysis adjusts for what was recorded. It cannot adjust for what was not, and lifestyle scores are particularly exposed to this, because a high score is partly a marker of having the money and time to live that way.
Reverse causation deserves a mention too. Someone whose diabetes is already progressing badly walks less, sleeps worse and socializes less, which lowers their score for reasons that are consequences of illness rather than causes.
The sensitivity checks reported by the authors held up, which addresses some of this without removing it.
Where it leaves things
There is trial evidence that Mediterranean eating reduces cardiovascular events, which is why this pattern is recommended in the first place. What has been thin is evidence in people who already have type 2 diabetes, and this fills part of that gap.
The specific contribution is the breakdown. For anyone with diabetes trying to act on Mediterranean advice, the practical reading is that moving during the day, sleeping properly and eating with other people were carrying part of the association alongside the food. Nobody is selling any of those.
That is cheaper than the olive oil and considerably harder to arrange.
People also ask
What did the study find?
Compared with the lowest quartile of Mediterranean Lifestyle Index adherence, the highest quartile had hazard ratios of 0.73 (95% CI 0.59-0.91) for major adverse cardiovascular events, 0.74 (0.58-0.93) for all-cause mortality and 0.49 (0.30-0.81) for cardiovascular mortality, with all p-trend values below 0.01.
What is the MEDLIFE index?
A 25-item score in three blocks: Mediterranean food consumption, Mediterranean dietary habits, and physical activity, rest, social habits and conviviality. It runs from 0 to 25, and it scores how someone lives rather than only what they buy.
How is that different from a Mediterranean diet score?
A diet score counts foods. This one also counts habits around eating, such as not snacking between meals, plus daily activity, sleep, napping and time spent eating with other people.
Did the food part do all the work?
No. The authors report that each of the three blocks contributed to the observed associations, so activity, rest and social habits were not passengers on a diet result.
Does this prove the lifestyle causes the benefit?
No. It is an observational cohort, and people who live this way differ from those who do not in wealth, education, existing illness and much else. The pattern is consistent with trial evidence for the Mediterranean diet in cardiovascular prevention, which is not the same as proof here.
Why study people who already have diabetes?
Because they carry a substantially higher risk of heart attacks and strokes than the general population, and the evidence for this way of eating and living has mostly been gathered in people who do not have diabetes.
What should someone with type 2 diabetes take from it?
That the parts of this pattern nobody sells, such as regular activity, adequate rest and eating with other people, appear to matter alongside the food. Diabetes management belongs with a clinical team. This is general information rather than medical advice.