"The human brain is made up of 95% water, blood is 82% and lungs 90%. A mere 2% drop in our body's water supply can trigger signs of dehydration: fuzzy short-term memory, trouble with basic math, and difficulty focusing on smaller print, such as a computer screen. (Are you having trouble reading this? Drink up!) Mild dehydration is also one of the most common causes of daytime fatigue. An estimated seventy-five percent of Americans have mild, chronic dehydration."The human voice is very dependent upon water. Dehydrated vocal cords (folds) are not as flexible and able to thin as hydrated ones. These folds are so small and their operation so exact (or not), a little dehydration can result in a large dent in your vocal ability in any given performance. And the very use of the vocal cords causes them to lose moisture to the air. As an extreme example of the vocal cord-water connection, I had a very bad case of laryngitis and a very important gig. I literally could not talk but had to lead a background vocal group in two days of sessions. I discovered that if I drank huge glasses of water with a little pineapple juice added, I could sing, even in my head voice. I ended up drinking about 18 mega glasses of water a day, and really didn't pee more than usual. The moisture was being used and evaporated from my vocal cords into the air.
Judy Rodman - All Things Vocal Blog
Training & insights for stage and studio singers, speakers, vocal coaches and producers from professional vocal coach and author of "Power, Path & Performance" vocal training method. Download All Things Vocal podcast on your fav app!