Study analysis · Journal of Hypertension · 2023
Mediterranean diet beat DASH for blood pressure—by 3.2 mm Hg—when both cut salt, in a 3-month trial.
In adults with slightly high blood pressure, a Mediterranean-style diet plus salt restriction lowered office systolic blood pressure more than DASH plus salt restriction, salt restriction alone, or no/minimal intervention over 3 months.
Overview
What the study found
The study in plain English — the bottom line, every takeaway we extracted, and what to do with them.
In simple terms
This study is like a fair test where people were randomly put into different diet groups to see how their blood pressure changed. Because it was randomized and had a control group, it gives good evidence that the diets themselves helped lower blood pressure in these people. But we can't see all the details, so we can't say these diets cure or prevent high blood pressure for everyone.
What’s the bottom line?
Adults with slightly high blood pressure were put on different diets for 3 months. All diets lowered blood pressure. The Mediterranean diet plus salt restriction lowered the top blood pressure number more than the DASH diet plus salt restriction, salt restriction alone, or no diet change.
How strong is this study?
The study was well-designed in some ways: it randomly assigned 240 people to four groups and measured blood pressure carefully. But we only have a short summary, not the full details, and 15% of people dropped out, so we don't know if everything was done perfectly. That means we can trust the main result somewhat, but we shouldn't treat it as the final word.
0 / 100
- COI disclosureconflicts of interest not disclosed
- Data availabilitydata not shared
- Code availabilitycode not shared
74 / 100
- Randomization+20/20
- Blindingblinding unclear
- Control group+15/15
- Sample size (n=240)+14.0/20
- Follow-up+10/10
100 / 100
77 / 100
- P-values+15/15
- Effect size+20/20
- Confidence intervalsno confidence intervals
- Pre-registration+15/15
Each component is scored out of 100 and then capped by the study design — a case series cannot reach the ceiling a randomised trial can, however well it is reported.
Where it sits
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 565 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
This design can establish causation. The abstract explicitly states random assignment to four groups, so the study can support causal inference about the dietary interventions and blood pressure. However, abstract-only reporting prevents verification of allocation concealment, blinding, adherence, and missing data handling; 15% attrition and unknown blinding further limit certainty.
COI Unknown
Could not determine conflict of interest status
No conflict of interest or funding information is provided in the available text.
The provided text is an abstract-level report without authors, affiliations, COI declaration, or funding statement. Therefore, conflicts of interest and funder involvement cannot be assessed.
Key takeaways
- 01
After 3 months, Mediterranean diet plus salt restriction lowered office systolic blood pressure by an absolute 15.1 mm Hg more than control, by 7.5 mm Hg more than salt restriction alone, and by 3.2 mm Hg more than DASH plus salt restriction (all p<0.001).
- 02
DASH and Mediterranean diets worked similarly for office diastolic and 24-hour ambulatory blood pressure, but both were better than salt restriction alone.
- 03
For someone with high-normal blood pressure or mild hypertension, adding a Mediterranean diet to salt restriction may lower systolic blood pressure by about 7.5 mm Hg more than salt restriction alone and about 15.1 mm Hg more than no/minimal intervention over 3 months.
- 04
A 3.2 mm Hg extra reduction versus DASH is modest.
- 05
The study did not measure heart attacks or strokes, so long-term benefits are uncertain.
- 06
Absolute risk was not applicable because the outcome was blood pressure change, not disease events.
Practical takeaways
For adults with high-normal BP or untreated grade 1 hypertension, consider a Mediterranean-style diet plus salt restriction for 3 months to help lower office systolic BP.
Based on abstract only; full methodology, blinding, and confidence intervals unavailable. Short 3-month follow-up; no heart attack/stroke outcomes. Not medical advice.
low confidenceAdding either DASH or a Mediterranean diet to salt restriction may lower BP more than salt restriction alone.
No difference between DASH and Mediterranean on diastolic or 24h ambulatory BP; abstract-only. Individual results may vary.
low confidenceIf you only cut salt and BP remains high, discuss with a clinician whether a structured dietary pattern like DASH or Mediterranean is appropriate.
This study did not test medicated patients or higher BP grades; do not stop medications without medical advice.
low confidenceWhy this study matters
Mediterranean Diet Edges Out DASH on Office Systolic BP
In a 3-month RCT of 240 never drug-treated adults with high-normal BP or grade 1 hypertension, Mediterranean diet plus salt restriction lowered office systolic BP by an absolute 15.1 mm Hg more than control, 7.5 mm Hg more than salt restriction alone, and 3.2 mm Hg more than DASH plus salt restriction (all p<0.001).
DASH is often framed as the gold-standard diet for blood pressure, so a head-to-head win for Mediterranean—even a modest 3.2 mm Hg—is a strong hook.
But the Diets Tied on Diastolic and 24-Hour BP
DASH plus salt restriction and Mediterranean plus salt restriction did not differ for office diastolic BP or 24-hour ambulatory systolic and diastolic BP. Both diets still lowered BP more than salt restriction alone.
It shows the Mediterranean advantage may be specific to office systolic readings, not a clean sweep.
Salt Restriction Alone Helps—Adding a Diet Helps More
All intervention groups reduced office and 24-hour ambulatory BP versus control. However, DASH and Mediterranean diets were more efficient in BP-lowering compared with salt restriction alone.
Many people start and stop at 'cut salt.' This suggests that the dietary pattern around salt restriction matters.
Who Was Studied: Untreated, High-Normal to Grade 1
Participants were 240 never drug-treated adults with high-normal BP or grade 1 hypertension. 204 (85%) completed the 3-month study; analysis was intention-to-treat and pre-registered (NCT05669404).
This is exactly the group often told to try lifestyle first, but findings may not apply to people already on medication or with higher BP.
Limitations You Must Mention
Abstract-only: blinding not specified, confidence intervals not reported, and follow-up was only 3 months. Hard cardiovascular outcomes like heart attacks or strokes were not assessed.
It helps audiences judge whether the headline is actionable or just preliminary.
Want the whole report?
Detailed mode opens the full scientific breakdown — every score component, the methodology, conflicts of interest, the evidence analysis behind each claim, and the raw study data.
Overview
What the study found
The study in plain English — the bottom line, every takeaway we extracted, and what to do with them.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Adults with slightly high blood pressure were put on different diets for 3 months. All diets lowered blood pressure. The Mediterranean diet plus salt restriction lowered the top blood pressure number more than the DASH diet plus salt restriction, salt restriction alone, or no diet change.
Research results
After 3 months, Mediterranean diet plus salt restriction lowered office systolic blood pressure by an absolute 15.1 mm Hg more than control, by 7.5 mm Hg more than salt restriction alone, and by 3.2 mm Hg more than DASH plus salt restriction (all p<0.001). DASH and Mediterranean diets worked similarly for office diastolic and 24-hour ambulatory blood pressure, but both were better than salt restriction alone.
What this means - more context
For someone with high-normal blood pressure or mild hypertension, adding a Mediterranean diet to salt restriction may lower systolic blood pressure by about 7.5 mm Hg more than salt restriction alone and about 15.1 mm Hg more than no/minimal intervention over 3 months. A 3.2 mm Hg extra reduction versus DASH is modest. The study did not measure heart attacks or strokes, so long-term benefits are uncertain. Absolute risk was not applicable because the outcome was blood pressure change, not disease events.
To assess blood pressure effects of a 3-month intensive dietary intervention implementing salt restriction alone or with DASH or Mediterranean diet versus no/minimal intervention in adults with high-normal blood pressure or grade 1 hypertension.
In a 3-month randomized controlled trial of 240 never drug-treated adults with high-normal BP or grade 1 hypertension, office and 24h ambulatory BP were reduced in all intervention groups versus control. Mediterranean diet plus salt restriction produced greater office systolic BP reduction than control (absolute mean difference -15.1 mm Hg), salt restriction alone (-7.5 mm Hg), and DASH plus salt restriction (-3.2 mm Hg; all p<0.001). DASH and Mediterranean diets did not differ for office diastolic BP or 24h ambulatory BP, but both were more effective than salt restriction alone.
Methods Used
Randomized controlled trial. 240 never drug-treated individuals assigned to control (n=60), salt restriction (n=60), DASH plus salt restriction (n=60), or Mediterranean diet plus salt restriction (n=60). Primary outcome was attained office systolic BP difference among arms at 3 months. 204 (85%) completed; intention-to-treat analysis. Registration NCT05669404.
Main Finding
Primary outcome: office systolic BP difference among randomized arms at 3 months. Mediterranean diet plus salt restriction was superior: absolute mean differences versus control -15.1 mm Hg, versus salt restriction alone -7.5 mm Hg, and versus DASH plus salt restriction -3.2 mm Hg (all p<0.001). DASH plus salt restriction and Mediterranean diet plus salt restriction did not differ for office diastolic BP or 24h ambulatory BP; both lowered BP more than salt restriction alone. Absolute risk not applicable (continuous BP outcome).
Confidence Level
Limited - based on abstract only, full methodology, blinding, and confidence intervals not available. Strengths: randomized, intention-to-treat, 85% completion, pre-registered. Limitations: short 3-month follow-up; hard cardiovascular outcomes not assessed.
Study Flags
Red Flags
- •Full text not available - methodology details cannot be verified
- •Blinding not specified in abstract
- •Confidence intervals not reported in abstract; only p-values
- •Short 3-month follow-up; long-term cardiovascular outcomes not assessed
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Practical Takeaways
For adults with high-normal BP or untreated grade 1 hypertension, consider a Mediterranean-style diet plus salt restriction for 3 months to help lower office systolic BP.
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 565 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Human RCT
Subject
Moderate probability
on the GRADE evidence scale
This study is like a fair test where people were randomly put into different diet groups to see how their blood pressure changed. Because it was randomized and had a control group, it gives good evidence that the diets themselves helped lower blood pressure in these people. But we can't see all the details, so we can't say these diets cure or prevent high blood pressure for everyone.
Strengths
- Randomized controlled trial design with four parallel arms
- Sample size of 240 participants
- Control group included
Weaknesses
- Full methodology not available - based on abstract only
- Blinding status unknown; dietary interventions are difficult to blind
- 15% attrition (36/240 did not complete)
Methodology
Evidence Keywords
Statistical Reporting
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Adults with slightly high blood pressure were put on different diets for 3 months. All diets lowered blood pressure. The Mediterranean diet plus salt restriction lowered the top blood pressure number more than the DASH diet plus salt restriction, salt restriction alone, or no diet change.
Research results
After 3 months, Mediterranean diet plus salt restriction lowered office systolic blood pressure by an absolute 15.1 mm Hg more than control, by 7.5 mm Hg more than salt restriction alone, and by 3.2 mm Hg more than DASH plus salt restriction (all p<0.001). DASH and Mediterranean diets worked similarly for office diastolic and 24-hour ambulatory blood pressure, but both were better than salt restriction alone.
What this means - more context
For someone with high-normal blood pressure or mild hypertension, adding a Mediterranean diet to salt restriction may lower systolic blood pressure by about 7.5 mm Hg more than salt restriction alone and about 15.1 mm Hg more than no/minimal intervention over 3 months. A 3.2 mm Hg extra reduction versus DASH is modest. The study did not measure heart attacks or strokes, so long-term benefits are uncertain. Absolute risk was not applicable because the outcome was blood pressure change, not disease events.
To assess blood pressure effects of a 3-month intensive dietary intervention implementing salt restriction alone or with DASH or Mediterranean diet versus no/minimal intervention in adults with high-normal blood pressure or grade 1 hypertension.
In a 3-month randomized controlled trial of 240 never drug-treated adults with high-normal BP or grade 1 hypertension, office and 24h ambulatory BP were reduced in all intervention groups versus control. Mediterranean diet plus salt restriction produced greater office systolic BP reduction than control (absolute mean difference -15.1 mm Hg), salt restriction alone (-7.5 mm Hg), and DASH plus salt restriction (-3.2 mm Hg; all p<0.001). DASH and Mediterranean diets did not differ for office diastolic BP or 24h ambulatory BP, but both were more effective than salt restriction alone.
Methods Used
Randomized controlled trial. 240 never drug-treated individuals assigned to control (n=60), salt restriction (n=60), DASH plus salt restriction (n=60), or Mediterranean diet plus salt restriction (n=60). Primary outcome was attained office systolic BP difference among arms at 3 months. 204 (85%) completed; intention-to-treat analysis. Registration NCT05669404.
Main Finding
Primary outcome: office systolic BP difference among randomized arms at 3 months. Mediterranean diet plus salt restriction was superior: absolute mean differences versus control -15.1 mm Hg, versus salt restriction alone -7.5 mm Hg, and versus DASH plus salt restriction -3.2 mm Hg (all p<0.001). DASH plus salt restriction and Mediterranean diet plus salt restriction did not differ for office diastolic BP or 24h ambulatory BP; both lowered BP more than salt restriction alone. Absolute risk not applicable (continuous BP outcome).
Confidence Level
Limited - based on abstract only, full methodology, blinding, and confidence intervals not available. Strengths: randomized, intention-to-treat, 85% completion, pre-registered. Limitations: short 3-month follow-up; hard cardiovascular outcomes not assessed.
Study Flags
Red Flags
- •Full text not available - methodology details cannot be verified
- •Blinding not specified in abstract
- •Confidence intervals not reported in abstract; only p-values
- •Short 3-month follow-up; long-term cardiovascular outcomes not assessed
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Practical Takeaways
For adults with high-normal BP or untreated grade 1 hypertension, consider a Mediterranean-style diet plus salt restriction for 3 months to help lower office systolic BP.
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 565 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Human RCT
Subject
Moderate probability
on the GRADE evidence scale
This study is like a fair test where people were randomly put into different diet groups to see how their blood pressure changed. Because it was randomized and had a control group, it gives good evidence that the diets themselves helped lower blood pressure in these people. But we can't see all the details, so we can't say these diets cure or prevent high blood pressure for everyone.
Strengths
- Randomized controlled trial design with four parallel arms
- Sample size of 240 participants
- Control group included
Weaknesses
- Full methodology not available - based on abstract only
- Blinding status unknown; dietary interventions are difficult to blind
- 15% attrition (36/240 did not complete)
Methodology
Evidence Keywords
Statistical Reporting
Scoring
How strong is this study?
The study was well-designed in some ways: it randomly assigned 240 people to four groups and measured blood pressure carefully. But we only have a short summary, not the full details, and 15% of people dropped out, so we don't know if everything was done perfectly. That means we can trust the main result somewhat, but we shouldn't treat it as the final word.
0 / 100
- COI disclosureconflicts of interest not disclosed
- Data availabilitydata not shared
- Code availabilitycode not shared
74 / 100
- Randomization+20/20
- Blindingblinding unclear
- Control group+15/15
- Sample size (n=240)+14.0/20
- Follow-up+10/10
100 / 100
77 / 100
- P-values+15/15
- Effect size+20/20
- Confidence intervalsno confidence intervals
- Pre-registration+15/15
Each component is scored out of 100 and then capped by the study design — a case series cannot reach the ceiling a randomised trial can, however well it is reported.
Where it sits
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 565 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
This design can establish causation. The abstract explicitly states random assignment to four groups, so the study can support causal inference about the dietary interventions and blood pressure. However, abstract-only reporting prevents verification of allocation concealment, blinding, adherence, and missing data handling; 15% attrition and unknown blinding further limit certainty.
COI Unknown
Could not determine conflict of interest status
No conflict of interest or funding information is provided in the available text.
The provided text is an abstract-level report without authors, affiliations, COI declaration, or funding statement. Therefore, conflicts of interest and funder involvement cannot be assessed.
Standing
Who’s using this study?
The videos and claims on this site that lean on this study, and the researchers who wrote it.
1 video from Dr Brad Stanfield cite this study, drawing 1 claim from it.
- Very strong evidence
Randomized or controlled trials support this claim, alongside consistent supporting evidence.
Evidence
Authored by
12 researchersIf this is your work, this is how we attribute it on Fit Body Science. Christina Filippou is listed as the lead author.