Cited by 272Nutritional Studies and DietNatural Antidiabetic Agents StudiesAdipokines, Inflammation, and Metabolic Diseases

The DOI matches its Crossref record; 242 of the 254 references it cites were found in a registry or an index; none of the 256 sources its claims cite is checked for support yet.

Mediterranean Diet Nutrients to Turn the Tide against Insulin Resistance and Related Diseases

Open access

Abstract

Insulin resistance (IR), defined as an attenuated biological response to circulating insulin, is a fundamental defect in obesity and type 2 diabetes (T2D), and is also linked to a wide spectrum of pathological conditions, such as non-alcoholic fatty liver disease (NAFLD), cognitive impairment, endothelial dysfunction, chronic kidney disease (CKD), polycystic ovary syndrome (PCOS), and some endocrine tumors, including breast cancer. In obesity, the unbalanced production of pro- and anti-inflammatory adipocytokines can lead to the development of IR and its related metabolic complications, which are potentially reversible through weight-loss programs. The Mediterranean diet (MedDiet), characterized by high consumption of extra-virgin olive oil (EVOO), nuts, red wine, vegetables and other polyphenol-rich elements, has proved to be associated with greater improvement of IR in obese individuals, when compared to other nutritional interventions. Also, recent studies in either experimental animal models or in humans, have shown encouraging results for insulin-sensitizing nutritional supplements derived from MedDiet food sources in the modulation of pathognomonic traits of certain IR-related conditions, including polyunsaturated fatty acids from olive oil and seeds, anthocyanins from purple vegetables and fruits, resveratrol from grapes, and the EVOO-derived, oleacein. Although the pharmacological properties and clinical uses of these functional nutrients are still under investigation, the molecular mechanism(s) underlying the metabolic benefits appear to be compound-specific and, in some cases, point to a role in gene expression through an involvement of the nuclear high-mobility group A1 (HMGA1) protein.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

This narrative review argues that the Mediterranean diet (MedDiet) and selected nutrients—unsaturated fatty acids, flavonoids/anthocyanins, resveratrol, EVOO-derived oleacein, and polyphenols—can improve insulin resistance (IR) and related conditions such as T2D, NAFLD, cognitive impairment, PCOS, breast cancer, endothelial dysfunction, dyslipidemia, hypertension, and CKD. It emphasizes compound-specific mechanisms, including possible HMGA1-mediated gene regulation, while noting that clinical and safety evidence remains incomplete.

Key findings

  • IR affects approximately 25%–35% of Westernized populations and is linked to obesity, T2D, CVD, NAFLD, cognitive impairment, PCOS, CKD, and some cancers; MedDiet has been associated with greater IR improvement in obese individuals than other low-energy diets, even with <5% body weight loss.
  • A meta-analysis of 8 prospective cohorts (312,015 participants; 19,953 incident T2D cases over 4–28 years) found the highest total flavonoid intake associated with an 11% lower T2D risk, with a 5% risk reduction per 300 mg/day increment.
  • In a randomized placebo-controlled trial, 1500 mg/day resveratrol for 3 months decreased testosterone and DHEAS excess by ~23% in PCOS women; in mice, 20 mg/day oleacein for 5 weeks protected against abdominal fat accumulation, weight gain, and liver steatosis.
  • In PREDIMED, breast cancer incidence rates were 1.1 per 1000 person-years for EVOO-enriched MedDiet, 1.8 for nuts-enriched MedDiet, and 2.9 for control; in NU-AGE, 1-year SBP decreased by −4.7 mmHg in the intervention group versus a 0.9 mmHg increase in controls.

Methods

  • Narrative review, not a systematic review or meta-analysis; it synthesizes mechanistic, epidemiological, animal-model, and clinical evidence on MedDiet components and IR-related diseases.
  • Evidence discussed includes in vitro studies, experimental animal models, randomized controlled trials, prospective cohorts, cross-sectional studies, and meta-analyses, with findings summarized in Tables 1–2 and Figures 1–5.
  • Main analysis is qualitative synthesis from a compound-centric perspective, linking nutrients such as PUFAs/MUFAs, flavonoids, anthocyanins, resveratrol, oleacein, and other polyphenols to IR-related pathways and outcomes.

Limitations

  • Stated in paper: current knowledge about how MedDiet functional components modulate insulin action and signaling is still limited; further in vivo studies are needed to determine therapeutic potential in humans and tissue-level biological activities.
  • Stated in paper: safety and effective dosing of isolated polyphenol supplements are uncertain, with risks including hepatotoxicity, stroke/premature death, and carcinogenesis at high doses; longer follow-up and larger sample sizes are needed for promising supplements.
  • Evident from text: as a narrative review, it does not report a systematic search strategy, risk-of-bias assessment, or quantitative pooling; some cited evidence is inconclusive, such as the CRIC study finding no significant association between baseline HOMA-IR and CKD progression, CVD events, or mortality in non-diabetic CKD patients.

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Integrity signals

Registry

Crossref · 10.3390/nu12041066

Cites

242 of 242 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

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Show all 95 claims

  • It may state two separate claims as one. 81
  • Probably not a substantial claim. 18
93 of 93
  • The paper relies on this without support.

    The molecular mechanisms underlying the metabolic benefits of Mediterranean diet-derived functional nutrients are compound-specific and, in some cases, involve gene expression through the nuclear high-mobility group A1 protein.

    “Although the pharmacological properties and clinical uses of these functional nutrients are still under investigation, the molecular mechanism(s) underlying the metabolic benefits appear to be compound-specific and, in some cases, point to a role in gene expression through an involvement of the nuclear high-mobility group A1 (HMGA1) protein.”
  • The paper relies on this without support.

    Protein intake in the MedDiet is very close to that of traditional controlled protein diets for CKD (~0.8 g/kg/day).

    “Protein intake in the MedDiet is very close to that of traditional controlled protein diets for CKD (~0.8 g/kg/day).”
  • The paper relies on this without support.

    CKD is a major risk factor for insulin resistance development due to imbalance of circulating pro-inflammatory cytokines and adipokines following reduced kidney function.

    “CKD is also considered a major risk factor for IR development, given the unbalance of circulating pro-inflammatory cytokines and adipokines that follows the reduction in kidney function.”
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Metadata

Authors
Mirabelli, M., Chiefari, E., Arcidiacono, B., Corigliano, D. M., Brunetti, F. S., Maggisano, V., Russo, D., Foti, D. P., & Brunetti, A.
Affiliations
Magna Graecia University (IT)
Corresponding author
Brunetti, Antonio
Venue
Nutrients
Publisher
MDPI AG
Published
2020-04-12
Volume
12
Issue
4
Pages
1066
ISSN
2072-6643 (ISSN-L)
OpenAlex
W3015424411
Cited by
272
References
254
Citations by year
2026: 30 · 2025: 47 · 2024: 44 · 2023: 55 · 2022: 44 · 2021: 35 · 2020: 14
FWCI
6.20
Type
journal article
Language
en
Open access
Locations
  • Nutrients (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • European Commission (2014‐2020, FSE 2014-2020)
  • Regione Calabria
  • European Regional Development Fund (FSE 2014-2020, 2014-2020’)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Nutritional Studies and Diet
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Natural Antidiabetic Agents Studies
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adipokines, Inflammation, and Metabolic Diseases
Keywords
Mediterranean diet, insulin resistance, type 2 diabetes, obesity, extra virgin olive oil, polyphenols, resveratrol, oleacein, anthocyanins, polyunsaturated fatty acids, non-alcoholic fatty liver disease, polycystic ovary syndrome, chronic kidney disease, breast cancer, HMGA1, adipokines, weight loss, functional foods
MeSH terms
Olive Oil, Diabetes Mellitus, Type 2, Female, Humans, Insulin Resistance, Male, Nutritional Physiological Phenomena, Nuts, Obesity, Vegetables, Gene Expression, HMGA1a Protein, Diet, Mediterranean, Polyphenols

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