The new study set out to determine the effects of caffeine on “fat oxidation,” or the rate at which your body burns fat. To test this, 15 male participants with an average age of 32 were asked to perform an exercise test four times at seven-day intervals, with researchers making sure each participant was tested the same amount of time since their last meal or workout and that they weren’t taking any supplements. Researchers also gave each subject 3 mg/kg of caffeine—the equivalent to a strong cup of coffee—or a placebo at 8 a.m. and 5 p.m. Results showed that participants who ingested caffeine burned fat at a faster rate during their workout than those who had taken the placebo. “The results of our study showed that acute caffeine ingestion 30 minutes before performing an aerobic exercise test increased maximum fat oxidation during exercise,” Francisco José Amaro-Gahete, an assistant professor from the Department of Physiology at the University of Granada in Spain and the lead author of this research, said in a statement.ae0fcc31ae342fd3a1346ebb1f342fcb Researchers also found that while caffeine always affected fat burning, it was particularly potent when used before afternoon exercises. Their findings suggest that caffeine increases fat oxidation during morning workouts in a similar way to workouts without caffeine in the afternoon, suggesting that you’ll get the best results drinking a quick coffee before you exercise later in the day. And for more on what exercise can tell you about your health, check out If You Can’t Do This in 90 Seconds, Your Heart Is in Danger, Study Says. The new study seems to contradict the popular belief that starting your day with a workout will lead to the best results. “The recommendation to exercise on an empty stomach in the morning to increase fat oxidation is commonplace,” Amaro-Gahete explained. “However, this recommendation may be lacking a scientific basis, as it is unknown whether this increase is due to exercising in the morning or due to going without food for a longer period of time.” And for more health news delivered right to your inbox, sign up for our daily newsletter. The new study is based on a small sample set, so the findings warrant further research into how caffeine can help your body burn fat. But it’s still important to avoid ingesting too much caffeine: According to a 2015 report from the European Food Safety Authority, adults can safely consume up to 400 mg of caffeine a day, or around 200 mg per serving, without feeling negative side effects such as anxiety, insomnia, or irregular heart rhythm. And for more on how much java you can safely have, check out If You Drink This Much Coffee a Day, Your Heart’s in Danger, Study Finds.
