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Observational studies suggest that the regular ingestion of potatoes adversely affects cardiometabolic health, but controlled studies in humans are needed to establish causality. Our objective was to assess whether daily inclusion of non-fried potato foods as part of a Dietary Guidelines for Americans (DGA)-based dietary pattern would impair cardiometabolic health in adults with metabolic syndrome (MetS).

In a 2-arm, randomized controlled, crossover trial separated by a 2-wk washout period, MetS adults were provided a eucaloric DGA-based dietary pattern containing potato (350 g with 17.5 g/d resistant starch; POTATO) or an energy-matched bagel (0 g/d resistant starch; CON) for 14 d. Fasting blood was collected on d 0 and 14. On d 14, after a 75 g oral glucose tolerance test, brachial artery flow-mediated dilation (FMD) was measured and blood was collected at 30 min intervals for 2 h to …