I recently read some of the posts here on the board about diabetes insipidus (aka water diabetes), and did some further reading on the web. Nice to know there's a reason I'm always thirsty. Today I've been very conscious of drinking a lot of fluids. One result was that I had a very bad low blood sugar attack only 2 hours after lunch. I usually can go at least three hours before noticing any symptoms, let alone the bad ones. Is there any reason drinking extra water and decaf tea should deplete blood sugar more rapidly? When the kidneys pull water from the body, do they also remove any sugar?