There is no such thing as “the five breakfast foods that hurt your kidneys the most”. If your kidney function is normal, normal consumption of food will not harm your kidneys; however, if your kidney function is not normal, you need to pay attention to controlling water, protein and potassium in food. 1. Control water: the main role of the kidneys is to expel excess water from the body. In the case of abnormal kidney function, excess water cannot be discharged from the body through the kidneys, and it is easy to accumulate in the body. At this time, it is necessary to avoid excessive water intake according to the need to restrict water intake, and eat less food with high water content, such as rice pudding, pork chop soup and so on. 2. Large amount of protein: people with abnormal renal function have insufficient function to deal with protein metabolites, protein metabolites can’t be excreted normally, accumulating in the body and leading to toxicity, which needs to be controlled according to the condition of the protein food intake. Kidney function abnormalities, per kilogram of body weight protein intake needs to be controlled at about 0.8 grams, the actual also need to combine with the renal function situation to adjust. Excessive protein intake is very dangerous, need to avoid some high protein food, especially plant protein. 3. High potassium food: People with abnormal kidney function have decreased potassium excretion ability, and too much potassium will cause serious threat to the heart and other organs. High potassium foods include beans, bananas and hawthorn. The most important dietary principle for normal people is to have a balanced, diversified and moderate diet. Eating a variety of vegetables, fruits and meats in moderation is good for health and nutritional balance; if you have abnormal kidney function, you should consider the dietary taboos according to the actual situation.