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e-Letters: Observations

Primary Prevention of Sexual Dysfunction With Mediterranean Diet in Type 2 Diabetes: The MÈDITA Randomized Trial

  1. Maria Ida Maiorino1⇑,
  2. Giuseppe Bellastella1,
  3. Paolo Chiodini2,
  4. Ornella Romano3,
  5. Lorenzo Scappaticcio1,
  6. Dario Giugliano1 and
  7. Katherine Esposito3
  1. 1Division of Endocrinology and Metabolic Diseases, Department of Medical, Surgical, Neurological, Metabolic Sciences and Aging, Second University of Naples, Naples, Italy
  2. 2Medical Statistics Unit, Second University of Naples, Naples, Italy
  3. 3Diabetes Unit, Department of Clinical and Experimental Medicine, Second University of Naples, Naples, Italy
  1. Corresponding author: Maria Ida Maiorino, mariaida.maiorino{at}unina2.it.
Diabetes Care 2016 Sep; 39(9): e143-e144. https://doi.org/10.2337/dc16-0910
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Type 2 diabetes has been associated with sexual dysfunction in men and women (1). Erectile dysfunction (ED) is a marker of significantly increased risk of cardiovascular disease and all-cause mortality in men with diabetes and the general population; however, no data support a clear role for female sexual dysfunction (FSD) as a predictor of future cardiovascular events in women with diabetes.

There is some evidence from clinical trials that sexual dysfunction is amenable to amelioration with interventions based on diet and lifestyle modification in men and women (2). Using the data of the MEditerranean DIet and Type 2 diAbetes (MÈDITA) randomized trial (3), we investigated the long-term effect of Mediterranean diet on 1) incident ED and FSD in people with type 2 diabetes and 2) combined incidence of sexual dysfunction (men or women) with worsening of sexual function in those participants with sexual dysfunction at baseline.

Participants in the two-arm, single-center MÈDITA trial were randomly assigned to a Mediterranean diet (n = 108) or a low-fat diet (n = 107), with a total follow-up of 8.1 years. Sexual function was evaluated by completing the validated self-reported questionnaires International Index of Erectile Function (IIEF) and Female Sexual Function Index (FSFI) at baseline, before randomization, and every 6 months. Survival curves were estimated by the product-limit method of Kaplan-Meier for the two groups (Mediterranean diet and low-fat diet) and compared by the log-rank statistic.

There was no difference in baseline sexual function in men (n = 54 vs. 52; P = 0.287) or women (n = 54 vs. 55; P = 0.815) randomized to Mediterranean diet or low-fat diet, respectively. Over the entire follow-up, the incidence of the primary outcome was significantly lower in the Mediterranean diet group compared with the low-fat diet group (ED: hazard ratio 0.44 [95% CI 0.19–1.00], P = 0.045 [Fig. 1A]; FDS: hazard ratio 0.44 [0.19–1.00], P = 0.048 [Fig. 1B]). Similarly, the incidence of the secondary outcome was also lower in the Mediterranean diet group (new ED and deterioration of preexisting ED: hazard ratio 0.41 [0.21–0.83], P = 0.011 [Fig. 1C]; new FSD and deterioration of preexisting FSD: 0.50 [0.25–0.99], P = 0.045 [Fig. 1D]). Compared with participants assigned to the low-fat diet, participants assigned to Mediterranean diet showed greater reduction in weight (−0.98 kg) over the entire follow-up. In the analyses that adjusted for change in body weight, HbA1c, or depressive symptoms, the hazard ratios (95% CI) were 0.48 (0.20–0.99), 0.47 (0.19–0.99), and 0.49 (0.23–0.99), respectively.

Figure 1
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Figure 1

Probability of incident ED and FSD in patients with diabetes. A: Incident ED in patients free of ED at baseline (primary end point). B: Incident FSD in patients free of FSD at baseline (primary end point). C: Incident ED plus worsening of ED in patients with ED at baseline. D: Incident FSD plus worsening of FSD in patients with FSD at baseline. MED diet, Mediterranean diet.

The current study is the first long-term dietary trial demonstrating that the Mediterranean diet conferred benefit on both prevention (56% relative risk reduction) and deterioration of sexual dysfunction in both men and women with newly diagnosed type 2 diabetes. In adults with type 2 diabetes, a Mediterranean-style dietary pattern may improve the inflammatory milieu and cardiovascular risk (4), both these effects being beneficial to achieving improvement of sexual dysfunction in people with diabetes (5). Although the evaluation of sexual function was not planned in the original study protocol, both primary and secondary outcomes were similar, suggesting that the results were robust.

Article Information

Funding. This study was supported in part by the Second University of Naples and the “Associazione Salute con Stile.”

The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; or decision to submit the manuscript for publication.

Duality of Interest. D.G. and K.E. reported receiving speaker fees from and served on advisory boards for Merck Sharp & Dohme, Lilly, Novo Nordisk, and Sanofi. No other potential conflicts of interest relevant to this article were reported.

Author Contributions. M.I.M., D.G., and K.E. participated in the study concept and design. G.B., O.R., and L.S. collected data. All authors provided data interpretation and analysis. P.C. and D.G. carried out the statistical analyses. All authors contributed to the drafting of the manuscript and approved the final version of the manuscript. D.G. obtained funding. D.G. and K.E. provided the administrative, technical, or material support and supervised the study. D.G. is the guarantor of this work and, as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.

Footnotes

  • Clinical trial reg. no. NCT00725257, clinicaltrials.gov.

  • Received April 27, 2016.
  • Accepted May 20, 2016.
  • © 2016 by the American Diabetes Association.

http://diabetesjournals.org/site/license

Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. More information is available at http://diabetesjournals.org/site/license.

References

  1. ↵
    1. McCabe MP,
    2. Sharlip ID,
    3. Lewis R, et al
    . Risk factors for sexual dysfunction among women and men: a consensus statement from the Fourth International Consultation on Sexual Medicine 2015. J Sex Med 2016;13:153–167
    OpenUrlCrossRefPubMed
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    1. Esposito K,
    2. Giugliano D
    . Lifestyle/dietary recommendations for erectile dysfunction and female sexual dysfunction. Urol Clin North Am 2011;38:293–301
    OpenUrlCrossRefPubMed
  3. ↵
    1. Esposito K,
    2. Maiorino MI,
    3. Petrizzo M,
    4. Bellastella G,
    5. Giugliano D
    . The effects of a Mediterranean diet on the need for diabetes drugs and remission of newly diagnosed type 2 diabetes: follow-up of a randomized trial. Diabetes Care 2014;37:1824–1830
    OpenUrlAbstract/FREE Full Text
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    1. Fox CS,
    2. Golden SH,
    3. Anderson C, et al.; American Heart Association Diabetes Committee of the Council on Lifestyle and Cardiometabolic Health; Council on Clinical Cardiology, Council on Cardiovascular and Stroke Nursing, Council on Cardiovascular Surgery and Anesthesia, Council on Quality of Care and Outcomes Research; American Diabetes Association
    . Update on prevention of cardiovascular disease in adults with type 2 diabetes mellitus in light of recent evidence: a scientific statement from the American Heart Association and the American Diabetes Association. Diabetes Care 2015;38:1777–1803
    OpenUrlAbstract/FREE Full Text
  5. ↵
    1. Esposito K,
    2. Giugliano F,
    3. Maiorino MI,
    4. Giugliano D
    . Dietary factors, Mediterranean diet and erectile dysfunction. J Sex Med 2010;7:2338–2345
    OpenUrlCrossRefPubMed
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Primary Prevention of Sexual Dysfunction With Mediterranean Diet in Type 2 Diabetes: The MÈDITA Randomized Trial
Maria Ida Maiorino, Giuseppe Bellastella, Paolo Chiodini, Ornella Romano, Lorenzo Scappaticcio, Dario Giugliano, Katherine Esposito
Diabetes Care Sep 2016, 39 (9) e143-e144; DOI: 10.2337/dc16-0910

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Primary Prevention of Sexual Dysfunction With Mediterranean Diet in Type 2 Diabetes: The MÈDITA Randomized Trial
Maria Ida Maiorino, Giuseppe Bellastella, Paolo Chiodini, Ornella Romano, Lorenzo Scappaticcio, Dario Giugliano, Katherine Esposito
Diabetes Care Sep 2016, 39 (9) e143-e144; DOI: 10.2337/dc16-0910
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