“Black coffee gives you an artificial source of energy, and because of the adrenal rush, it helps you work out better. Therefore, black coffee is often taken as a pre-workout drink. It is also used during keto diets during intermittent fasting, where you are reducing the number of macronutrients in your body and the timeline is maintained. During the time that you’re not eating and you do not want your body to generate gas, that’s when you can consume black coffee before a workout, so that you have a good source of energy. You can train well without reducing your efficiency in your training. This results in burning more calories and reducing weight,” says Brian Dsouza, Sports nutritionist, Celebrity fitness trainer.