Potato consumption is prospectively associated with risk of hypertension: An 11.3-year longitudinal cohort study

Abstract

Background & aims: Government has popularized potatoes as the staple food in China. Potatoes as a potassium-rich food show high glycemic responses after consumption. Whether potato consumption is prospectively linked with the risk of hypertension remains unclear in oriental populations. In this study, we aimed to investigate the association of potato consumption with the risk of hypertension among Chinese people.

Methods: A total of 11,763 adults (≥20 years old) who were free of hypertension at baseline were enrolled from China Health and Nutrition Survey (CHNS) Cohort study in 1989-2011. Participants were excluded if they were <20 years old, identified to be pregnant, and previously diagnosed with hypertension, cancers, infarction, apoplexy and diabetes at baseline. Cox proportional hazards regression models were used to estimate the associations after adjusting for potential confounders.

Results: During average 11.3 years of follow-up, 4033 incident cases of hypertension were ascertained. People who consumed more amounts of total potatoes, stir-fried potatoes, and non stir-fried potatoes had higher risk of hypertension (P for trend = 0.1225, 0.2168 and 0.0456, respectively). Multivariable hazard ratios (HRs) for increased consumption of total potatoes were 1.402 (95% confidence interval [CI], 1.270-1.548), 1.198 (95% CI, 1.014-1.415), and 1.120 (95% CI, 0.929-1.349) compared with non-consumers. However, the participants with higher intake of potato consumption were inclined to have lower risk of hypertension when excluding the non-consumers of total potatoes or stir-fried potatoes (P for trend = 0.0271 and 0.0001). In addition, a positive association of sweet potatoes intake with hypertension risk was only found in urban residents (P for trend = 0.0239).

Conclusions: Our results showed that potato consumption was prospectively associated with hypertension in Chinese population. As the urbanization process continues along with the transition to Western-style diets, more consideration should be taken before the formulation of potato popularization is promoted in China.

Keywords: China Health and Nutrition Survey; Hypertension; Potato consumption; Stir-fried potatoes; Sweet potatoes.