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Background
Dietary restrictions or reductions such as fasting for weight loss are often difficult to adhere to due to increased appetite and food cravings. Recently, gastrointestinal delivery of bitter hops has been shown to be effective at reducing appetite in men. Our aim was to determine the effect of a bitter hop extract on appetite and cravings in women, using a 24 h, water-only fast.
Methods
This was a randomized, double-blind, cross-over treatment study. Thirty adult women were recruited and required to fast for 24 h from 1800 h to 1800 h on three occasions and given an ad libitum meal to break each fast. Treatments of either a placebo or one of two doses -- high dose (HD): 250 mg; or low dose (LD): 125 mg -- of a bitter hop-based appetite suppressant (Amarasate) were given twice per day at 16 and 20 h into the fast.
Results
The HD and LD treatment groups exhibited a significant (P<0.05) reduction in appetite and cravings for food when compared to the placebo control. Two participants reported loose stools and one reported heartburn while on the HD treatment, and one participant reported loose stools while on the LD treatment.
Conclusion
These data suggest that appetite suppressant co-therapy may be useful in reducing hunger during fasting in women and shows that gastrointestinal delivery of bitter compounds may also be an effective method of reducing cravings for food.
This trial received ethical approval from the Northern B New Zealand Human Disability and Ethics Committee - Northern B Health and Disability Ethics Committee (2022 EXP 10995) and was prospectively registered with the Australian New Zealand Clinical Trial Registry (ACTRN12622000107729).
Read an interview about the study here and expert commentary about it here.
Primary Source
Obesity Pillars
Walker E, et al "Gastrointestinal delivery of bitter hop extract reduces appetite and food cravings in healthy adult women undergoing acute fasting" Obes Pillars 2024; 11: 100117.