Why am I craving?

Ever since I was little I always wanted something to drink. Even now as I'm older I really crave drinks. Doesn't matter if its water, juice, soda, etc I will crave every drink out there. Anything I drink has to be cold aswell. I've waterlogged myself multiple times just because I crave that refreshing feeling of a nice cold drink. I don't know why im like this
Why am I craving?
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