Why am I so hungry lately?

I've been really hungry lately and craving certain foods, and I get automatically hungry again right after eating... Why am I so hungry?
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I just had a thought... I used to never drink much water, but now I've been drinking nothing but water for the past week. I just bought one of those infuser tumblers that I can put fruit in...
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and I've been using it non stop... could this be why?
Why am I so hungry lately?
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