Does the Mediterranean diet help your heart?

Randomised trials including PREDIMED and CORDIOPREV found fewer heart attacks and strokes with a Mediterranean-style diet, plus a small blood-pressure drop.

Published October 2026

Short answer

Yes for preventing heart attacks and strokes, especially in people at higher risk; trials show moderate benefits. Whether it helps you live longer is less clear. Evidence grade B (Moderate). Several randomised trials and meta-analyses measured heart attacks and strokes directly, but results are heterogeneous (up to 87%), PREDIMED had randomisation problems, and a Cochrane review is more cautious — one downgrade for inconsistency.

Key takeaways

In PREDIMED, 7,447 people at high risk of heart disease who ate a Mediterranean diet had about 30% fewer heart attacks, strokes and heart deaths over 4.8 years [1].
In people who already had heart disease, CORDIOPREV found fewer heart events over 7 years with a Mediterranean diet than with a low-fat diet [2].
Pooled trials found strokes fell from about 24 to 14 per 1,000 people, and blood pressure fell slightly (about 1-3 mm Hg) [3][4].
Trials disagree about whether the diet reduces deaths from any cause: a network meta-analysis found a 28% lower risk, while another pooled analysis found no clear effect [5][6].
Large observational studies link higher adherence to lower risk of dying during follow-up, but they cannot prove cause and effect [7].

The short version

Yes - a Mediterranean-style diet can help your heart. In large randomised trials, people who ate this way had fewer heart attacks and strokes than people on a low-fat or usual diet [1][2], and pooled trials show a small drop in blood pressure [4]. The benefit is clearest for people at higher risk of heart disease [8], and whether the diet lowers the risk of dying from any cause is still debated [5][6].

What the studies show

The biggest test is PREDIMED, which assigned 7,447 people at high risk of heart disease, but with no heart disease at the start, to a Mediterranean diet plus extra virgin olive oil, a Mediterranean diet plus nuts, or a low-fat diet [1]. Over a median of 4.8 years, the two Mediterranean groups had about 30% fewer heart attacks, strokes and heart deaths (hazard ratios 0.69 and 0.72) [1]. The trial was withdrawn in 2018 after problems were found with how some participants were assigned; it was re-analysed and re-published, and the benefit held [1].

A 2019 Cochrane review of 30 trials (12,461 people) was more cautious. It found moderate-quality evidence that strokes fell from about 24 to 14 per 1,000 people, but only low-quality evidence on whether deaths changed [3]. Then CORDIOPREV tested the diet in 1,002 people who already had heart disease: over 7 years, the Mediterranean group had 87 major heart events versus 111 in the low-fat group (hazard ratio 0.72 to 0.75 after adjustment) [2]. The benefit was clear in men; among the 175 women, no difference was found [2].

Newer pooled analyses mix these trials. A 2024 meta-analysis of four large trials (10,054 people) found about half the odds of a major heart event with the Mediterranean diet (odds ratio 0.52), with smaller reductions in heart attacks and strokes; results varied a lot between trials [6]. A 2023 network meta-analysis of 40 trials (35,548 people), rated moderate certainty, found Mediterranean-style programmes cut deaths from any cause by 28%, heart deaths by 45%, strokes by 35% and non-fatal heart attacks by 52% compared with minimal advice - with no clear advantage over low-fat programmes [5].

The nuances

Who it helps most: people who already have heart disease or are at high risk, as in PREDIMED and CORDIOPREV [1][2]. That is also where a 2025 umbrella review of 18 meta-analyses found the effect strongest [8]. That review found most of the meta-analyses it checked were of low or critically low quality [8].

The diet is a pattern, not a single ingredient. The version tested in trials is built around olive oil, nuts, fatty fish, vegetables, legumes, fruit and whole grains, with little red meat [3]. Wine with meals is optional; the Cochrane definition lists it only as an extra [3]. Alcohol raises the risk of several cancers, and pooled research on light drinking found no safe level for cancer risk, so non-drinkers have no reason to start [9].

Side effects: trials that reported them found none or only minor ones [3]. In a 2021 trial of 1,221 high-risk pregnancies, the diet reduced the number of babies born small for gestational age (14% versus 22% with usual care), though the authors call the findings preliminary [10]. If you take medicines or have a health condition, talk to your doctor before changing your diet.

What this means for you

The practical takeaway from the trials: meals built from vegetables, legumes, whole grains, fruit, fish, olive oil and nuts, with red meat and sweets occasional, were the ones linked to fewer heart events [3]. It is not a low-fat diet - the trials did not restrict fat, and they supplied olive oil or nuts alongside the diet [1][11].

For most people the expected effects are modest: blood pressure may fall by only 1-3 mm Hg [4][3], and weight and diabetes risk improve slightly [12][13]. The heart-event benefit was largest in high-risk groups, so the more heart risk you have, the more this way of eating may matter [8]. For the full evidence, doses used in studies and safety details, see the Mediterranean diet topic page.

Go deeper

Mediterranean Diet — Eating a Mediterranean-style diet - built on olive oil, nuts, fish, vegetables, legumes and whole grains - reduced heart attacks and strokes in large randomise…
Olive Oil — Extra virgin olive oil, eaten as part of a Mediterranean diet, is linked to fewer heart events, and a large trial of that diet found fewer major heart events.
Fatty Fish — Eating fish, especially fatty fish such as salmon, sardines and mackerel, is linked to a lower risk of heart disease and stroke.
Nuts — Nuts lower LDL cholesterol a little in trials and, in trials lasting more than three weeks, do not appear to cause weight gain.