If you can collect some urine from your cat, bring it to the vet to have it checked. I suspect that the weight5 loss is due to the kidneys leaking protein, which you are likely to find in the urine. If you do, you need to replace the protein. I like to do it with a kidney puree; puree in a blender or food processor equal parts of raw beef kidney and water, pour into ice cube trays and freeze. Keep some in the refrigerator thawing out, so there is always some available. This provides more protein, water, and the nutrients needed for kidney repair, as well as acting as a glandular to limit kidney damage from autoantibodies. Epikatin contains calcium carbonate, which binds phosphorus, as does Tums, along with chitosan, which binds Urea nitrogen. There is no potential problem using either. The same company also sells a probiotic which uses the urea nitrogen for bacterial growth, and, at least in theory, causes more urea nitrogen from the blood to diffuse into the intestines, lowering the BUN. Any good quality probiotic should do the same. These are all usefull strategies, but you should speak to your vet about them.

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