The German Society of Nephrology has stated that added fructose in processed foods can damage the kidneys. These foods include carbonated drinks, energy drinks, sports drinks, iced tea, and flavored water. Fruit yogurt, granola bars, breakfast cereals, and sweets may also contain high levels of this substance, as well as ready-made sauces, dressings, and baked goods. The society advises caution when seeing ingredients like 'fructose-glucose syrup' or 'corn syrup' on the label and to avoid these products as much as possible. Consuming large amounts of fructose over a long period can harm the kidneys in several ways: when fructose is broken down, the body produces more uric acid. If uric acid levels remain high, uric acid crystals can build up in kidney tissue, potentially leading to kidney damage, stone formation, and inflammation. High fructose intake promotes fat buildup and inflammation in the body, which can damage the small blood vessels in the kidneys. There are also indirect effects; high fructose consumption can increase insulin resistance, high blood pressure, and fatty liver disease, all of which worsen kidney function. The society also noted that the problem is not with fructose found in fresh fruit, so there is no need to worry when enjoying apple slices or blueberries as a snack. In general, to maintain kidney health, one should maintain a healthy weight, combat obesity, and treat high blood pressure and diabetes.
