I adopted the second person from the title, assuming, without seeing a full document, that this was intended as a type of public service announcement. I'd also confirm my guess that rehydration is needed or ask what the proper remedy would be, ask what people should do to avoid this problem, and see if the author wants to include things that health care workers should look for. And a decrease in your daily water intake can actually reduce cell efficiency. Beginning in early adulthood, your thirst sensation gradually fails and your body becomes increasingly dehydrated. The water content of the cells decreases, and the ratio of water volume in the cells to that outside the cells drops drastically, from 1.1 to barely 0.8.
Chronic dehydration can cause symptoms that mimic disease.
When other signals of dehydration are not recognized, health care workers treat these signals with medicine rather than the necessary rehydration. My approach would be to reduce the text to only what makes sense to me, because I'd assume there's no way one can query the author. I'm pretty ruthless with what I can't figure out. I rewrote the title as well. As people age, their thirst sensation gradually diminishes.