According to a study done in 2005, "nothing else comes close" to providing as many antioxidants as coffee. While fruits and vegetables also have tons of antioxidants, the human body seems to absorb the most from coffee.
Researchers at the Seoul National University examined the brains of rats who were stressed with sleep deprivation and discovered that those who were exposed to coffee aromas experienced changes in brain proteins tied to that stress.
Science Daily reported in 2012 that drinking coffee may help people with Parkinson's disease control their movement. Ronald Postuma, MD, the study author, said, "Studies have shown that people who use caffeine are less likely to develop Parkinson's disease, but this is one of the first studies in humans to show that caffeine can help with movement symptoms for people who already have the disease."
A study published in 2006 that included 125,000 people over 22 years showed that those who drink at least one cup of coffee a day were 20 percent less to develop liver cirrhosis -- an autoimmune disease caused by excessive alcohol consumption that could lead to liver failure and cancer.
Arthur L Klatsky, the lead author of the study, told The Guardian, "Consuming coffee seems to have some protective benefits against alcoholic cirrhosis, and the more coffee a person consumes the less risk they seem to have of being hospitalised or dying of alcoholic cirrhosis."
Studies have also shown that coffee can help prevent people from developing non-alcoholic fatty liver disease (NAFLD). An international team of researchers led by Duke-NUS Graduate Medical School revealed that drinking four or more cups of coffee or tea a day may be beneficial in preventing the progression of NAFLD.
A study done by the National Institute of Health found that those who drink four or more cups of coffee were about 10 percent less likely to be depressed than those who had never touched the java. And apparently it's not because of the "caffeine high" -- Coke can also give you a caffeine high, but it's linked to depression.
A study done by the Harvard School of Public Health determined that drinking between two and four cups of coffee can reduce the risk of suicide in men and women by about 50 percent. The proposed reason is because coffee acts as a mild antidepressant by aiding in the production of neurotransmitters like serotonin, dopamine and noradrenaline.