Lingonberries and lingonberry extract may help manage blood sugar, according to test-tube and animal research, which might be related to its polyphenol and fiber levels. These findings are backed up by preliminary human investigations. Despite the increased carbohydrates from the fruit, healthy males who ate sweetened yogurt with 1/3 cup (40 grams) of lingonberry powder had the same blood sugar and insulin levels as when they ate yogurt without lingonberry powder. Similarly, healthy women who ate 2/3 cup (150 grams) of pureed lingonberries with around 3 tablespoons (35 grams) of sugar had a 17 percent lower peak insulin after eating than a control group who ate the sugar without the lingonberries. Controlling insulin levels and avoiding insulin spikes can help you maintain your body's insulin sensitivity, lowering your risk of type 2 diabetes and obesity.