Patients with IgA nephropathy vary greatly in the severity of their condition, and whether they can eat peaches depends on their individual disease state. If a patient does not have increased creatinine levels and no edema, they can eat peaches like a normal person without any restrictions on quantity.

If the patient has increased creatinine levels, they need to control the amount of peaches they consume. This is because, in patients with elevated creatinine, the glomerular filtration rate is decreased, and a decrease in glomerular filtration rate can lead to an inability to expel excess potassium ions from the body. Peaches are a fruit with a high potassium content, and if such patients consume too many peaches, it can lead to hyperkalemia. Mild cases may experience weakness and numbness in the limbs, while severe cases can lead to potentially fatal cardiac arrhythmias.