# Green Mediterranean diet may improve folate status and cardiometabolic markers more than the traditional Mediterranean pattern
Interest in dietary patterns that modify metabolic risk continues to grow.
A recent analysis from the randomized DIRECT-PLUS trial, published in Clinical Nutrition, compared a conventional Mediterranean diet, standard healthy-eating guidance, and a modified “Green Mediterranean” plan that emphasizes polyphenol-rich plant foods and plant-based protein.
The Green-MED arm raised circulating folate and was linked to favorable shifts in several cardiometabolic biomarkers.
The trial also explored interactions with a common genetic variant that impairs folate metabolism.
The Green Mediterranean diet is a Mediterranean-style eating plan with extra emphasis on plant-sourced, polyphenol-rich foods and plant-based protein; in the DIRECT-PLUS randomized trial it increased blood folate concentrations and associated with improvements in multiple cardiometabolic biomarkers compared with a standard Mediterranean or healthy diet.
The Mediterranean dietary pattern centers on vegetables, fruits, legumes, whole grains, unsaturated fats, lean animal proteins and limited processed foods, red meat, and added sugars.
Variants of this pattern have been studied for cardiometabolic health effects.
The Green Mediterranean modification shifts the emphasis further toward plant-derived foods with higher polyphenol content and greater representation of plant proteins.
Folate — a B vitamin involved in one-carbon metabolism — participates in biochemical reactions that build and repair DNA and provide methyl groups used in epigenetic regulation of gene activity.
Efficient folate-dependent one-carbon metabolism is described in the study as supportive of cardiovascular and metabolic function, while impaired folate handling is associated with elevated homocysteine, endothelial dysfunction, inflammation, and increased cardiometabolic risk.
The investigators were also attentive to genetic variation in folate metabolism.
They focused on the MTHFR gene single nucleotide polymorphism rs1801133 (C677T).
Individuals who inherit two copies of the higher-risk allele (the TT genotype) commonly display reduced MTHFR enzyme activity; prior evidence referenced by the study suggests enzyme activity in TT homozygotes can be markedly lower than normal.
The TT genotype has been linked to higher homocysteine concentrations and greater risk for several cardiovascular and metabolic conditions.
Study context and design: The findings derive from DIRECT-PLUS, an international randomized controlled intervention comparing dietary strategies for metabolic outcomes and adipose distribution.
One randomized arm followed a Green Mediterranean diet that incorporated plant-focused, polyphenol-rich foods and emphasized plant-based protein sources; other arms followed either a standard Mediterranean diet or general healthy dietary recommendations.
Dietary intervention specifics: Participants in the Green-MED group consumed a daily shake that contained the aquatic plant mankai (Wolffia globosa), also referred to as duckweed.
Mankai was described as a plant source supplying protein, fiber, minerals, essential amino acids, and naturally occurring folate.
The trial monitored adherence and related biomarker changes across groups.
Genetic stratification: Investigators evaluated participants by MTHFR rs1801133 genotype to assess whether dietary response differed by genetic variants associated with folate metabolism.
The study noted the TT genotype prevalence at approximately 10–15% of the global population and characterized its functional impact on enzyme activity.
Outcomes assessed: The trial measured circulating folate concentrations and a panel of cardiometabolic markers.
Investigators also derived cardiovascular risk scores and examined changes over time in relation to diet adherence and genotype status.
The report links these biomarker shifts with the nutritional and bioactive composition of the dietary pattern rather than isolated nutrient supplementation.
The study notes that individuals with two copies of the at-risk allele often exhibit substantially diminished MTHFR enzymatic function, which has been associated in other work with higher homocysteine and elevated cardiometabolic risk.
Participants with this genotype who consumed little mankai experienced an increase in cardiovascular risk scores over time.
Conversely, TT individuals who adhered closely to the mankai-enriched Green-MED diet had a marked reduction in cardiovascular risk scores.
This trial suggests that modifying a Mediterranean dietary pattern to increase plant-based, polyphenol-rich foods and include specific plant protein sources may alter folate biomarkers and relate to improvements in cardiometabolic measures.
The interaction with MTHFR genotype reported in the study indicates that diet-gene relationships can influence risk-marker trajectories.
The trial highlights the potential for dietary composition and selected plant foods to impact nutrient-mediated metabolic networks in ways that differ across genetic backgrounds.
Limitations noted in the source material: The source summarizes trial findings but does not provide all methodological details (for example, sample size, duration, or statistical metrics) in the summary.
The article reports associations observed in the DIRECT-PLUS randomized setting and emphasizes the role of dietary pattern rather than single-nutrient approaches; it does not claim definitive causation beyond the trial context or extend to clinical recommendations.
Q: What is the Green Mediterranean diet compared with the traditional Mediterranean diet?
A: The Green-MED variation intensifies the plant-based component of the Mediterranean pattern, focusing on foods high in polyphenols and increasing plant-derived protein sources within the overall Mediterranean framework.
Q: What role did mankai (Wolffia globosa) play in the trial?
A: A daily shake containing mankai was part of the Green-MED intervention.
The plant is described as providing protein, fiber, minerals, essential amino acids, and naturally occurring folate.
Adherence to a mankai-enriched Green-MED diet was associated with different cardiovascular risk trajectories among participants with an at-risk MTHFR genotype.
Q: How does MTHFR genotype influence response to the diet?
A: The study focused on the rs1801133 (C677T) variant.
Individuals with two copies of the higher-risk allele (TT genotype) commonly have lower MTHFR enzyme activity.
In this trial, TT carriers who consumed little mankai saw increases in cardiovascular risk scores, whereas those who followed the mankai-enriched Green-MED diet exhibited marked reductions.
Q: Does the study recommend folate supplements instead of dietary changes?
A: The investigators and a quoted genetic engineering specialist framed the findings as evidence that overall dietary patterns may be more meaningful than individual nutrient supplementation.
The source emphasizes dietary composition and food-based bioactives rather than recommending supplements.
In the DIRECT-PLUS randomized trial reported in Clinical Nutrition, a Green Mediterranean dietary approach that emphasizes polyphenol-rich plant foods and includes a daily mankai shake increased circulating folate more than a traditional Mediterranean diet or general healthy dietary guidance and was aligned with improvements in several cardiometabolic markers.
The trial observed genotype-dependent differences: individuals carrying two copies of a reduced-function MTHFR allele demonstrated divergent cardiovascular risk score changes contingent on mankai intake and diet adherence.
The source material presents these results as evidence that diet quality and specific plant-based components can affect folate status and related metabolic pathways, acknowledging the complexity of diet–gene interactions and the need to interpret findings within the trial’s reported scope.