Meena Shah1, Beverley Adams-Huet, Abhimanyu Garg. 1. Division of Nutrition and Metabolic Diseases and Center for Human Nutrition, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75235-9052, USA. meena.shah@utsouthwestern.edu
Abstract
BACKGROUND: The Dietary Approaches to Stop Hypertension (DASH) diet is recommended to manage blood pressure. The DASH diet is low in saturated fat, but it is not clear whether saturated fat should be preferentially replaced with carbohydrate or unsaturated fat, especially cis-monounsaturated fat. OBJECTIVE: A meta-analysis of intervention studies comparing high-carbohydrate and high-cis-monounsaturated fat diets was conducted to increase understanding of the effect of carbohydrate and cis-monounsaturated fat on blood pressure. DESIGN: For study diets to be included in the analysis, they had to be isoenergetic, and the subjects' body weight had to remain stable. Ten studies (6 randomized crossover, 1 randomized parallel, and 3 nonrandomized) met the inclusion criteria. RESULTS: According to the random-effects model, which incorporates between-study variation to estimate the overall effect, diets rich in carbohydrate resulted in significantly higher systolic blood pressure [x(-) difference: 2.6 (95% CI: 0.4, 4.7) mm Hg; P=0.02] and diastolic blood pressure [1.8 (0.01, 3.6) mm Hg; P=0.05] than did diets rich in cis-monounsaturated fat. When the meta-analysis was limited to randomized crossover studies, both systolic [1.3 (-0.3, 2.9) mm Hg; P=0.11] and diastolic [0.9 (-0.2, 2.1) mm Hg; P=0.11] blood pressure were higher with a high-carbohydrate than with a high cis-monounsaturated fat diet, but the differences were not significant. CONCLUSIONS: Diets rich in carbohydrate may be associated with slightly higher blood pressure than diets rich in cis-monounsaturated fat. However, the magnitude of the difference may not justify making recommendations to alter the carbohydrate and cis-monounsaturated fat content of the diet to manage blood pressure.
BACKGROUND: The Dietary Approaches to Stop Hypertension (DASH) diet is recommended to manage blood pressure. The DASH diet is low in saturated fat, but it is not clear whether saturated fat should be preferentially replaced with carbohydrate or unsaturated fat, especially cis-monounsaturated fat. OBJECTIVE: A meta-analysis of intervention studies comparing high-carbohydrate and high-cis-monounsaturated fat diets was conducted to increase understanding of the effect of carbohydrate and cis-monounsaturated fat on blood pressure. DESIGN: For study diets to be included in the analysis, they had to be isoenergetic, and the subjects' body weight had to remain stable. Ten studies (6 randomized crossover, 1 randomized parallel, and 3 nonrandomized) met the inclusion criteria. RESULTS: According to the random-effects model, which incorporates between-study variation to estimate the overall effect, diets rich in carbohydrate resulted in significantly higher systolic blood pressure [x(-) difference: 2.6 (95% CI: 0.4, 4.7) mm Hg; P=0.02] and diastolic blood pressure [1.8 (0.01, 3.6) mm Hg; P=0.05] than did diets rich in cis-monounsaturated fat. When the meta-analysis was limited to randomized crossover studies, both systolic [1.3 (-0.3, 2.9) mm Hg; P=0.11] and diastolic [0.9 (-0.2, 2.1) mm Hg; P=0.11] blood pressure were higher with a high-carbohydrate than with a high cis-monounsaturated fat diet, but the differences were not significant. CONCLUSIONS: Diets rich in carbohydrate may be associated with slightly higher blood pressure than diets rich in cis-monounsaturated fat. However, the magnitude of the difference may not justify making recommendations to alter the carbohydrate and cis-monounsaturated fat content of the diet to manage blood pressure.
Authors: Lee Hooper; Carolyn D Summerbell; Rachel Thompson; Deirdre Sills; Felicia G Roberts; Helen J Moore; George Davey Smith Journal: Cochrane Database Syst Rev Date: 2012-05-16
Authors: Ian J Brown; Paul Elliott; Claire E Robertson; Queenie Chan; Martha L Daviglus; Alan R Dyer; Chiang-Ching Huang; Beatriz L Rodriguez; Kiyomi Sakata; Hirotsugu Ueshima; Linda Van Horn; Liancheng Zhao; Jeremiah Stamler Journal: J Hypertens Date: 2009-02 Impact factor: 4.844
Authors: Elena Jovanovski; Any de Castro Ruiz Marques; Dandan Li; Hoang V T Ho; Sonia Blanco Mejia; John L Sievenpiper; Andreea Zurbau; Allison Komishon; Lea Duvnjak; Roberto B Bazotte; Vladimir Vuksan Journal: Nutr Rev Date: 2019-01-01 Impact factor: 7.110
Authors: Lawrence J Appel; Thomas D Giles; Henry R Black; Joseph L Izzo; Barry J Materson; Suzanne Oparil; Michael A Weber Journal: J Clin Hypertens (Greenwich) Date: 2009-07 Impact factor: 3.738