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Am J Clin Nutr. 2007 Mar;85(3):688-94.

Relation of nutrients and hormones in polycystic ovary syndrome.

Author information

1
Department of Internal Medicine, Division of Endocrinology, Clinical Nutrition and Vascular Medicine, University of California, Davis, CA 95817, USA. sekarakas@ucdavis.edu

Abstract

BACKGROUND:

Insulin resistance, infertility, and hirsutism, common characteristics of polycystic ovary syndrome (PCOS), improve with even modest weight loss. Optimal dietary treatment for PCOS is not known.

OBJECTIVE:

We compared the effects of acute protein administration with those of glucose challenges on hormones related to obesity and insulin resistance (ie, cortisol and insulin), hirsutism [ie, dehydroepiandosterone (DHEA) and androstenedione], and hunger (ie, ghrelin).

DESIGN:

Patients with PCOS (n = 28; aged 26 +/- 2 y) were tested with a 5-h oral-glucose-tolerance test (OGTT) and a euvolemic, euenergetic protein challenge.

RESULTS:

Glucose ingestion caused larger fluctuations in blood glucose and more hyperinsulinemia than did protein (P < 0.01, overall treatment-by-time interaction). During the protein challenge, cortisol and DHEA declined over 5 h. During OGTT, cortisol and DHEA increased after the third hour and began to show significant divergence from protein from the fourth hour (P <or= 0.01). During OGTT, 18 patients who had a blood glucose nadir of <69 mg/dL had elevated cortisol (baseline: 10.4 +/- 0.4; nadir: 5.9 +/- 0.1; peak: 12.7 +/- 0.9 microg/dL) and DHEA (baseline: 15.6 +/- 1.3; nadir: 11.2 +/- 1.0; peak: 24.6 +/- 1.6 ng/mL) (P < 0.01), whereas the remaining 10 patients with a glucose nadir of 76 +/- 2 mg/dL had no increase in adrenal steroids. Both glucose and protein suppressed ghrelin (from 935 +/- 57 to 777 +/- 51 pg/mL and from 948 +/- 60 to 816 +/- 61 pg/mL, respectively). After glucose ingestion, ghrelin returned to baseline by 4 h and increased to 1094 +/- 135 pg/mL at 5 h. After the protein challenge, ghrelin remained below the baseline (872 +/- 60 pg/mL) even at 5 h. The overall treatment effect was highly significant (P < 0.0001).

CONCLUSIONS:

Glucose ingestion caused significantly more hyperinsulinemia than did protein, and it stimulated cortisol and DHEA. Protein intake suppressed ghrelin significantly longer than did glucose, which suggested a prolonged satietogenic effect. These findings provide mechanistic support for increasing protein intake and restricting the simple sugar intake in a PCOS diet.

PMID:
17344488
DOI:
10.1093/ajcn/85.3.688
[Indexed for MEDLINE]

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