I am a double board certified US doctor.
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He needs to see a nephrologist.
The treatment in this situation is in two parts
a. ACE inhibitor medications. These slow the progression of the renal failure.
b. Low protein diet/vegetable protein only diet. This can slow and even reverse some of the damage and the diabetes.
He would also need to have this monitored by both the nephrologist and a dietitian.
There is no magic bullet for this, or instant "cure."
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