Abstract
Pigmented potatoes contain high concentrations of antioxidants including phenolic acids, anthocyanins and carotenoids; these bioactives have been implicated in the inhibition or prevention of cellular oxidative damage and chronic disease susceptibility. We studied the effects of pigmented potato consumption on immune response in healthy adult men. Free living healthy male participants (18-40 yr; n=12/group) were given 150 g of cooked white- (WP), yellow- (YP) or purple-flesh potatoes (PP) once a day for 6 wk in a double-blinded study. Blood was collected at baseline and wk 6 to analyze C-reactive protein (CRP), inflammatory cytokines, lymphoproliferation, NK cytotoxicity and phenotypes. Participants fed YP and PP had lower (P < 0.08) plasma IL-6 compared to those fed WP. A concurrent decrease (P < 0.08) in CRP concentration was observed in the PP group. Total Tc cells were lower while B cells were higher in PP, compared to the WP group (P < 0.05). Conversely, YP increased Th cell populations. In addition, mitogenic stimulation of B (PWM) and T cells (PHA) was increased (P < 0.05) in YP compared to PP and tended to be higher than WP, whereas there was a decrease (P < 0.05) seen in PP compared to WP. Therefore, pigmented potato consumption reduced inflammation and modulated immune cell phenotype in healthy adult men.
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