Coffee is an excellent source of antioxidants that can protect against cancer and heart disease. It provides many health benefits including reduced risk of liver disease, improved cognitive function, sharper memory, increased endurance, longevity, and reduced risk of Parkinson's and type 2 diabetes. While coffee contains caffeine, it also contains polyphenols that may prevent degenerative diseases. However, tannins in coffee can hinder iron absorption, which is important for certain groups. Alternatives like using sugar substitutes and milk alternatives can reduce calories when drinking coffee regularly.