Blueberries are a delicious fruit that are full of nutrients and antioxidants. They are commonly eaten in many different ways – in cereal, with yogurt, or as a snack. However, if you eat too many blueberries, you could experience some adverse effects. Eating too many berries could cause a rise in blood sugar levels and cause your body to release insulin. If you are eating a lot of berries, you should take steps to ensure that your body is properly handling the sugar levels. You should also monitor your body for any signs of an allergic reaction. You should eat blueberries only in moderation, and make sure that you are eating them in other fruits, vegetables, and grains.