When consumed in moderation, coffee can have positive physical and mental effects.
For instance, studies show that coffee may help reduce the risk of developing neurodegenerative diseases such as Alzheimer’s and Parkinson’s by 26–34% (11, 12).
A review of 18 studies further reported that each cup of coffee a person consumes per day may reduce their risk of developing type 2 diabetes by up to 7% (13).
Caffeine, the stimulant in coffee, has also been reported to create a short-term boost in energy and brain function, which many people rely on when they’re feeling tired (14, 15).
That said, regularly drinking coffee will cause your body to build up a tolerance, which will reduce the power of its effects. More importantly, regularly relying on coffee instead of getting proper nutrition or sleep can drain your energy over time (16).