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J Diabetes Complications. 2009 Jul-Aug;23(4):239-43. doi: 10.1016/j.jdiacomp.2007.12.006. Epub 2008 Apr 16.

The effects of two different hypocaloric diets on glucagon-like peptide 1 in obese adults, relation with insulin response after weight loss.

Author information

1
Institute of Endocrinology and Nutrition, Medicine School and Unit of Investigation, Hospital Rio Hortega, University of Valladolid, Valladolid, Spain. dadluis@yahoo.es

Abstract

OBJECTIVE:

Few studies have investigated the effect of type of diets on GLP-1 concentrations. The aim of this study was to compare the effect of two diets on circulating GLP-1 levels and the relation with insulin response after weight loss.

METHODS:

A population of 118 obese patients were analyzed. Patients were randomly allocated to two groups: (a) Diet I (low carbohydrate) and (b) Diet II (low fat). Biochemical and anthropometric parameters were measured before and after 3 months of hypocaloric diet.

RESULTS:

Fifty-two patients (12 male/40 female) were treated with Diet I and 66 patients (21 male/45 female) with Diet II. In Group I, basal GLP-1 levels did not change after dietary treatment (9.4+/-3.3 vs. 9.9+/-3.1 ng/ml; ns). In Group II, GLP-1 levels decreased significantly (8.4%) (9.2+/-3.3 vs 8.7+/-3.1 ng/ml; P<.05). In the multivariate analysis with a dependent variable (levels of GLP-1), only insulin levels remained as an independent predictor in the model (F=5.9; P<.05), with an increase of 0.6 ng/ml (95% CI 0.1-1.1) GLP-1 concentrations with each increase of 1 mUI/ml of insulin.

CONCLUSION:

A hypocaloric diet with a low fat percentage decreased GLP-1 levels with a direct correlation with insulin levels. Nevertheless, patients with a hypocaloric diet with a low carbohydrate percentage treatment did not change GLP-1 levels. Diet macronutrient manipulation on GLP-1 response could be useful in an obesity nutrition therapy.

PMID:
18413175
DOI:
10.1016/j.jdiacomp.2007.12.006
[Indexed for MEDLINE]

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