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  .
Research published in the Journal of Nutrition, Metabolism and Cardiovascular Diseases concluded that following the Mediterranean diet could help to mitigate the harmful effects of belly fat on your heart. Better yet, it boosts the number of healthy bacteria in your gut – a study published in the journal Frontiers in Nutrition saw levels rise by up to seven per cent, compared with a western diet.
» Solution: First, add some fiber and greens to your diet. Second, learn better technique with core-related exercises. (Oh wait, that's every exercise!) Your pushups, planks, crunches, squats, lifts, jumps and everything in between need to be mastered. You could be putting stress on the lower back or hip flexors instead of actually working the abs, and that will cause a small protrusion of the abdominals. Finally, incorporate short sets of weight training, like supersets.
4. Hormonal Belly: According to Rachel Attard, a certified personal trainer and nutritionist, a hormonal imbalance can contribute to weight gain. She explains how estrogen and progesterone can cause weight gain. The first point she makes is that high estrogen levels can increase insulin, which can lead to sugar cravings. This is why you see many women eat chocolate during PMS. Another point she makes is that high levels of estrogen have the ability to cause more fatty tissue growth. In most cases, she states that the excess fat is usually around the stomach area because estrogen also dictates where the body will distribute fat.