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Shows caffeine affects food intake at breakfast but its effect is “limited”

A new study from the University of Buffalo published in the Journal of the Academy of Nutrition and Dietetics found that after drinking caffeine participants ate 10% less breakfast at a provided buffet, but that the “eating less” effect did not last throughout the day. Caffeine’s abilities as a weight loss supplement have subsequently been seriously questioned. If you have been drinking coffee for weight loss, it may be time to stop:

Is Caffeine Linked To A Reduced Appetite?

“Caffeine is frequently added to dietary supplements with claims that it suppresses appetite and facilitates weight loss. Previous research has speculated that caffeine speeds metabolism or affects brain chemicals that suppress appetite. In addition, epidemiological evidence suggests that regular caffeine consumers have a lower body mass index (BMI) than non-consumers. The purpose of our study was to determine whether caffeine can in fact be linked to reduced food intake or suppressed appetite, and if the results vary by BMI,” explained lead investigator Leah M. Panek-Shirley, PhD, SUNY University at Buffalo, Department Exercise and Nutrition Sciences, Buffalo, NY, USA.

Americans consume an average of 8 ounces of coffee each day. For this study, 50 healthy adults ranging in age from 18 to 50 participated in this month-long study and were asked to drink juice with added caffeine “that was either equivalent to consumption of four ounces (1 mg/kg) or eight ounces (3 mg/kg) of coffee,” or no coffee for placebo purposes. 30 minutes after drinking the beverages (or not), participants were asked to eat as much as they wanted from a healthy breakfast buffet. Participants were also asked to record everything else they ate on study days and send the results to the researchers.

No Reported Differences

The small decrease in food intake among the coffee drinkers did not continue throughout the day. Instead, participants compensated for eating less at breakfast later in the day. There were also no differences in appetite among all the participants, and their individual BMIs had no effect either.

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