bad taste/breath is this normal

I am 3months pre-op, and I was told by my surgeon to lose weight, I have been on a protein diet for one week now, I am drinking alot of water, and no sugar, and the first carbs I have had in one week was some mashed potatoes last night, I am drinking protein shakes and eating protein bars, my question is, I have started to have a bad taste/breath, and I do not know if this is normal, does anyone else pre-op have this problem. Is it Ketosis?

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