eatlivefit.net

Good question, and one that seems obvious to some.  The most common side effect is thirst.  Duh, right?  But did you know that there are many other signals your body sends to your brain when dehydration sets in that you may not be aware of currently?  Such as:

• Feeling dizzy
• Muscle Cramps
• Cravings for Sweets
• Fewer trips to bathroom (for #1 or #2)

Here is an excellent article posted in BicyclingMagazine about just these symptoms and how to address them.
https://www.bicycling.com/news/a20044214/dehydration-symtoms/

Drinking plain, old fashioned water is the best way to keep your body working in perfect order. Every organ, tissue, and cell in your body needs it. Add an electrolyte drink when exercising at a strenuous level for more than 1 hour. Pretty plain and simple. You demand a lot from your body, so give it what it needs to perform at it’s best.