In addition to its pleasant taste, blueberries have a whole range of beneficial properties that are confirmed by specialists. According to Professor Nina Vishnevskaya, a Doctor of Medical Sciences, the high manganese content gives blueberries special value. Blueberries have long been known as a berry that positively affects vision. The anthocyanins contained in them strengthen the walls of the capillaries in the retina and improve blood supply to the organs of vision. However, their beneficial properties do not stop there. As Nina Vishnevskaya notes, manganese promotes better absorption of glucose by the body, thereby reducing the likelihood of sharp spikes in blood sugar levels. In addition, this trace element activates enzymes involved in the conversion of carbohydrates into energy. As a result, the body receives more energy, metabolism improves, and normal pancreatic function is maintained. ## How many berries can be eaten without harm Specialists recommend consuming between 100 to 150 grams of fresh blueberries per day. This amount allows for maximum benefit. At the same time, it is not advisable to exceed 200 grams per day. Excessive consumption of berries can lead to unpleasant consequences. Due to the high content of tannins, constipation may occur, and a large amount of organic acids can irritate the mucous membranes of the gastrointestinal tract. ## Who particularly benefits from blueberries According to specialists, it is recommended to regularly include blueberries in the diet for: * people whose work is associated with high visual strain; * schoolchildren and students; * elderly individuals for the prevention of age-related cognitive changes; * those who frequently encounter inflammatory diseases of the urinary tract, as the berry has a mild antiseptic effect. In diabetes, not only the fruits but also the leaves of blueberries are beneficial. They are often brewed together with the berries. This drink helps lower blood sugar levels and supports pancreatic function. Moreover, specialists point out that blueberries are one of the few berries that practically do not lose their beneficial properties after thermal processing. Another feature is the extremely low likelihood of developing an allergic reaction. Blueberries are not only a delicious seasonal berry but also a valuable source of biologically active substances. When consumed in moderation, they contribute to normal metabolism, help maintain stable blood sugar levels, positively affect vision and pancreatic function. The main thing is to adhere to the recommended norm and not to overindulge even in a healthy product.