The kidneys try to remove excess sugar in the bloodstream via urine, which explains why polyuria occurs as a warning sign of type 2 diabetes.
Alongside the need to urinate more often, the body then becomes more dehydrated.
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This explains why polydipsia occurs, because no matter how much you drink, you keep going to the bathroom.
As for polyphagia, if you can’t get energy from the food you’re eating, then no matter how much you eat, your body will still crave an energy source.
Source: Daily Express