Association between some dietary factors and risk of hypertension: Tehran lipid and glucose study [2008-11]

ABSTRACT

Background and Objective: Hypertension in long time can cause cardiovascular disorders and increase chance of stroke. This study was done to determine the association between some dietary factors and risk of hypertension. Methods: This cross-sectional study was conducted on the fourth phase [2008-11] of Tehran lipid and glucose study [TLGS]. In this study 6089 subjects [2807 males and 3282 females], aged 19-70 years, were participated and dietary, demographic, anthropometric and blood pressure of each subject were collected. Dietary intake was assessed using a validated and reliable food frequency questionnaire with 147-items. Odds ratio for hypertension according to quartiles of dietary factors was determined using logistic regression with adjustment for confounder variables. Results: The rate of hypertension was 29.8%. Mean of weight, body mass index, waist circumference, prevalence of abdominal obesity and alliteration in the hypertensive subjects were significantly higher than normotensive subjects [P<0.05]. There was a non significant direct relationship between energy density, total fat and saturated fat. Higher consumption of fiber was associated with lower risk of hypertension [OR 0.62, 95% CI 0.37-0.97]. The risk of hypertension increased in the highest quartiles of dietary protein [OR 1.20, 95% CI 1.02-1.43]. Odds ratio for hypertension was higher among subjects whom consumed lower fruits and nuts than those subjects with higher fruits consumption [OR 1.33, 95% CI 1.15-1.85] and nuts [OR 1.21, 95% CI 1.02-1.42]. Conclusion: High consumption of fiber could protect against hypertension while some dietary factors such as high consumption of protein could increase risk of hypertension