Blueberries are an excellent source of polyphenols antioxidants called flavonoids. And one group of flavonoids called anthocyanins present in berries are known to have a wide range of health benefits  . Study findings have shown that blueberries trigger the genes that regulate fat burning and storage. This helps in reducing visceral abdominal fat and lowers cholesterol  .
The stress hormone cortisol can really screw with your belly. The problem with cortisol is two-fold: First, the chemical makeup of cortisol causes the body to store visceral fat. Visceral fat is stored between your main organs and in the midsection and is the most dangerous type of fat. Experts state that visceral fat increases the risk of diabetes and heart disease.