Remember back when they kept trying to find something "bad" about coffee? All they found was good stuff about it.
Here's an article about coffee I boiled down A LOT for you (so you wouldn't have to read and read):
Coffee is made up of over 1500 chemical substances - approximately 850 volatile and 700 soluble.
Coffee aroma is responsible for all its flavor, other than sweet, sour, bitter and salt tastes that are registered by the tongue.
A cup of espresso contains, on average, 78mg of caffeine while a cup of brewed coffee averages 120mg.
Coffee has a very high antioxidant content. Antioxidants have been widely linked to a number of potential health benefits including protection against heart disease and cancer.
In addition to coffee’s well-known ability to increase performance on mental and physical tasks, coffee drinking has been strongly linked to lowering the risk of colorectal and liver cancers, asthma, type 2 diabetes, Alzheimer’s disease and Parkinson’s disease.