Caffeine can increase the rate of fat burning when drunk 30 minutes before aerobic exercise, scientists from the Department of Physiology at the University of Granada noted.

A study published in the Journal of the International Society of Sports Nutrition found that exercising in the afternoon will be more effective than in the morning.

The study included 15 men who took the exercise test four times at intervals of one week. Participants took 3 mg/kg caffeine or placebo at 8:00 and 17:00.

Research has shown that taking caffeine half an hour before aerobic exercise increases maximum fat oxidation. In this case, no dependence on the time of day was observed. However, there were diurnal variations in fat oxidation that increased during the day.