Hello,
I would like to state that sweet taste in the mouth can be due to various causes like
diabetes, ketosis, or some neurological disorders. Since your husband is a diabetic, it is a high probability that sweet taste in the mouth is due to the high levels of
glucose in the blood. Also, I would like to tell you that diabetes as a disease can have organ complications like nephropathy (related to kidney),
retinopathy, neuropathy etcetera. Sometimes the neurological alterations can also result in
altered taste is the mouth and some sensations may be directly affected. And I would like you to consult a physician and get your glucose levels under control by medicines and exercise.
As you also suggest the kidneys have been involved, I would like to tell you that sweet taste has probably nothing to do with the kidneys not filtering properly as diabetes is usually caused by reduced or no secretion of insulin or due to
insulin resistance. Please get your glucose levels under control for symptoms to subside.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Shilpi Sharma