Pre Op and Craving Ice- Any significance?

For the last 2 months I have been preparing for my surgery Aug7. I started taking a good multi-vit and drinking 64+ oz of water every day. I find I must have ice in it and I have taken to eating the ice cubes. Cold, wet and crunchy LOL I have herd that craving ice is a symptom of something like a vitamin deficiency or it is stress related. Do any of you know what if anything craving ice means? I go through 2 or 3 trays a day in my glasses of water. I am not doing any extra activities, don't go outside when it's hot and humid. Not eating more sweets or salty foods. I've never craved ice before since I have always had sensitive teeth, now the ice doesn't bother them. Weird huh?

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