New Coffee drinkers have a much lower risk of liver cirrhosis as can be referenced from the following studies conducted by Harvard School of Public Health

Several studies show that caffeine can boost your metabolic rate by 3–11% (5,6). Other studies indicate that caffeine can specifically increase fat burning by as much as 10% in obese individuals and 29% in lean people (7).

Although ingestion of caffeine can increase blood sugar in the short-term, long-term studies have shown that habitual coffee drinkers have a lower risk of developing type 2 diabetes compared with non-drinkers. The polyphenols and minerals such as magnesium in coffee may improve the effectiveness of insulin and glucose metabolism in the body.

Parkinson’s disease (PD) is mainly caused by low dopamine levels. There is consistent evidence from epidemiologic studies that higher consumption of caffeine is associated with lower risk of developing PD. The caffeine in coffee has been found in animal and cell studies to protect cells in the brain that produce dopamine.

• A systematic review of 26 studies including cohort and case-control studies found a 25% lower risk of developing PD with higher intakes of caffeinated coffee. It also found a 24% decreased risk with every 300 mg increase in caffeine intake. [18]
• A Finnish cohort study tracked coffee consumption and PD development in 6,710 men and women over 22 years. In that time, after adjusting for known risks of PD, those who drank at least 10 cups of coffee a day had a significantly lower risk of developing the disease than non-drinkers. [19]
• A large cohort of men and women were followed for 10 and 16 years, respectively, to study caffeine and coffee intake on PD. The results showed an association in men drinking the most caffeine (6 or more cups of coffee daily) and a 58% lower risk of PD compared with men drinking no coffee. Women showed the lowest risk when drinking moderate intakes of 1-3 cups coffee daily. [20]

Drinking 3-5 cups of coffee a day at midlife (mean age 50 years) was associated with a significantly decreased risk of Alzheimer’s disease later in life compared with low coffee drinkers after 21 years of follow-up. [23]