Diabetic nephropathy, as the name suggests, is a renal complication caused by long-term diabetes. The typical early symptom is a significant amount of proteinuria, which can usually be detected as high protein levels during routine urine tests. If it progresses to a late stage, the substantial amount of proteinuria can lead to general edema and possibly heart failure. Currently, there is no particularly effective treatment for diabetic nephropathy. The primary approach is to control blood sugar levels, keeping fasting blood glucose below 7 and postprandial glucose below 10. Diet-wise, it's important to consume low-salt, low-fat, diabetic-friendly foods. Daily salt intake should not exceed three grams. Foods that are fried, greasy, or high in starch, such as vermicelli, sweet potatoes, taro, and potatoes should be consumed in moderation. Peanuts, which are high in oil content, can be eaten in small amounts but not excessively, as they may also cause indigestion.