system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: Why does an IV of fluids make you feel so much better than drinking the same amount of fluids?

I know it goes into your body faster but an IV seems to make me feel miraculously better even if I drink fluids and wait.
gpt
Because the fluid is going straight into your blood and your blood isn’t having to use excess energy & part of the digestive to get it there. Normally water is absorbed from the walls small intestine & then goes into the blood stream. Going from an IV is a super fast short cut. 
Then your blood passes the renal system (kidneys) to process out toxins & excess liquid - the waste becomes urine. 

Short cut.