Hi staffy:
If you are a coffee fan, you may already have noticed that you need to clear your throat a lot. That's because caffeine acts as a diuretic and flushes water from your system. Loss of moisture makes the mucous in your throat more concentrated, thus the throat clearing.
What's happening is that when your body gets dehydrated, it pulls water from tissues that are less vital to survival and sends it to the ones that keep you alive. The mucous membranes, salivary glands, and other nonvital tissue give up warter to maintain normal hydration for organs like the heart, liver, brain, and kidneys. That's why your mouth gets dry and your phlegm gets thick.
In addition, because caffeine speeds up your whole metabolism, it stimulates the mucous-producing cells and they work harder and faster, creating higher than optimal levels of thick phlegm. A faster metabolism also uses more water, which leads you right back to dehidration.
If you're a serious coffee drinker and if you want to be a singer, I will tell you that I strongly advise you to stop there and to switch to decaf ( or water) later in the day.
Good luck with the assignment!
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