These include decreased urination or dark-colored urine, dizziness or lightheadedness, extreme thirst and dry mouth, or unusual tiredness and weakness
10.1016/j.febslet.2008.08.028 249

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Im a mainstream medical science physician, so Im unlikely to agree with any of those sources on every topic
What got dismissed as "normal aging" was actually treatable neuroinflammation, metabolic dysfunction, and vascular changes