According to a study from Griffith University’s Centre for Health Practice Innovation, drinking coffee acts as an appetite suppressant, meaning that you'll probably ingest fewer calories when you're sipping it.
Caffeine has been to shown to stimulate thermogenesis, which is the way your body turns food into heat and energy. By drinking a cup of coffee or espresso, you could be increasing the amount of calories and fat you burn all day.
Coffee even improves your workout, according to a study done by the School of Psychology at the University of Wales College of Cardiff. No matter what time of the day or night, they found, a cup of caffeinated coffee had positive effects on “alertness and improved performance on a variety of tasks.”