To be absolutely brutal and honest with you, nobody cares about I look forward to hearing from you.. The practical reason is that it's one of the various standard and conventionally polite ways to end the body of the letter. It's just a standard exit.
1 In some cases, liver failure causes this taste to occur. 2  Gastroesophogal reflux disease can cause the salty taste (even when no pain is present). 3  Some medicines can make everything taste odd. for example the drug enalapril, which is a drug used to prevent heart failure.
In the case of salty taste, taste-active ingredients are salts of sodium, potassium and lithium. The most common of these is, of course, table salt, or sodium chloride. When the salt dissolves into the saliva, it separates into positive and negative ions. Only the positive ions (sodium, potassium or lithium) have an impact on salty taste.