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Lifestyle and Behavioral Medicine
Session Title: Nutrition, Bariatric Surgery, and Cardiometabolic Health

Abstract 11415: Potatoes and Cardiometabolic Health: A Randomized, Cross-over Study

Originally publishedCirculation. 2019;140:A11415

    Intake of potassium (K+), a nutrient of public health concern, is inversely associated with blood pressure (BP) and vascular function. Potatoes are a rich source of K+, but are also carbohydrate (CHO) rich. Observational research suggests potatoes are associated with increased cardiometabolic risk. However, few randomized, controlled trials have been conducted. This study evaluated the cardiometabolic effects of daily potato intake versus refined grains in healthy adults.

    It was hypothesized that consumption of one medium-sized potato per day, as part of habitual intake, would affect fasting plasma glucose, blood pressure, arterial stiffness and body weight similarly to an isocaloric amount of refined grains.

    In this single-blind, randomized, crossover, supplemental feeding study, healthy participants received one potato-based side dish (P), or a control refined grain-based side dish (C) daily, for four weeks, separated by a minimum two week break. Dishes were isocaloric (~200 kcal) and CHO matched (average CHO, average K+: P: 36.8g, 865 mg; C: 34.4g, 119 mg). The dishes were commonly consumed side dishes prepared without excess saturated fat or sodium. Fasting blood samples were taken on two consecutive days at baseline and the end of each treatment period. BP and arterial stiffness (pulse wave velocity (PWV)) were assessed using the Sphygmocor EXCEL device (AtCor Medical, Sydney, Australia).

    Fifty adults (female n=34) aged 40 + 13 with a BMI of 24.5 kg/m2+ 3.56 completed this study. There was no between-treatment difference in fasting plasma glucose (P: 95.2 mg/dL, 95% CI: 93.9, 96.6; C: 96.2mg/dL, 95% CI: 94.8, 97.6, p=0.15) or change from baseline with either treatment (-0.97, mg/dL, 95% CI: -2.3, 0.35, p=0.15). There were no between-group differences in weight (0.26 kg, 95% CI: -0.12, 0.64, p=0.17), BP (systolic: 0.23 mmHg, 95% CI: -1.7, 2.11, p=0.81; diastolic: 0.17 mmHg; 95%CI: -1.4, 1.8, p=0.83) or PWV (1.4 m/s; 95% CI: -1.3, 4.2, p=0.3).

    In healthy adults, consumption of one medium-sized potato per day for four weeks had equivalent cardiometabolic effects to an isocaloric, carbohydrate matched quantity of refined grains. Potatoes can be an acceptable substitute for refined grains to increase K+ intake in line with current dietary recommendations.

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