I cannot recommend a specific diet without knowing many more things. I would have to perform a history and physical examination on your father-in-law. I would have to know all of his electrolytes including sodium, potassium, chloride, bicarbonate level, calcium, phosphorus, parathyroid hormone level, and vitamin D levels. The diet must be specific to the individual and there is no generic diet that can be prescribed based on a serum creatinine alone. I suggest that you consult with a dietitian in your country who can review your father-in-laws medical history and review his laboratory findings. This will lead to proper dietary information.
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