Anthocyanins in the lingonberry powder could contribute to the beneficial effects on glucose tolerance as anthocyanin-rich supplements from Montmorency tart cherries have been reported to have insulin lowering effects in patients with metabolic syndrome [37] and purified blueberry anthocyanins reduced blood glucose levels in a murine model of obesity [38]. This evidence concerns the gene INS and obesity due to melanocortin 4 receptor deficiency.