4.7 Article

A fish-based diet intervention improves endothelial function in postmenopausal women with type 2 diabetes mellitus: A randomized crossover trial

Journal

METABOLISM-CLINICAL AND EXPERIMENTAL
Volume 63, Issue 7, Pages 930-940

Publisher

W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.metabol.2014.04.005

Keywords

Diet; n-3 PUFA; Intervention studies; Endothelial function; Diabetes mellitus

Funding

  1. Ministry of Education, Culture, Sports, Science and Technology of Japan
  2. Ministry of Health, Labour and Welfare of Japan
  3. Osaka Gas Group Welfare Foundation
  4. Mitsui Life Social Welfare Foundation
  5. Grants-in-Aid for Scientific Research [24591350] Funding Source: KAKEN

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Objective. The beneficial effects of fish and n-3 polyunsaturated fatty acids (PUFAs) consumption on atherosclerosis have been reported in numerous epidemiological studies. However, to the best of our knowledge, the effects of a fish-based diet intervention on endothelial function have not been investigated. Therefore, we studied these effects in postmenopausal women with type 2 diabetes mellitus (T2DM). Materials/Methods. Twenty-three postmenopausal women with T2DM were assigned to two four-week periods of either a fish-based diet (n-3 PUFAs >= 3.0 g/day) or a control diet in a randomized crossover design. Endothelial function was measured with reactive hyperemia using strain-gauge plethysmography and compared with the serum levels offatty acids and their metabolites. Endothelial function was determined with peak forearm blood flow (Peak), duration of reactive hyperemia (Duration) and flow debt repayment (FDR). Results. A fish-based dietary intervention improved Peak by 63.7%, Duration by 27.9% and FDR by 70.7%, compared to the control diet. Serum n-3 PUPA levels increased after the fishbased diet period and decreased after the control diet, compared with the baseline (1.49 vs. 0.97 vs. 1.19 mmol/l, p <0.0001). There was no correlation between serum n-3 PUPA levels and endothelial function. An increased ratio of epoxyeicosatrienoic acid/dihydroxyeicosatrienoic acid was observed after a fish-based diet intervention, possibly due to the inhibition of the activity of soluble epoxide hydrolase. Conclusions. A fish-based dietary intervention improves endothelial function in postmenopausal women with T2DM. Dissociation between the serum n-3 PUPA concentration and endothelial function suggests that the other factors may contribute to this phenomenon. (c) 2014 Elsevier Inc. All rights reserved.

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