Boysenberry juice did not clearly increase energy expenditure after meals
A small crossover trial found no significant change in its main metabolic outcome, alongside a separate signal for increased fat oxidation.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
In this small trial, boysenberry juice did not significantly change the rise in energy expenditure after eating compared with placebo. Fat oxidation after meals increased, but that measures fuel use rather than weight loss. The abstract-based findings therefore provide a preliminary metabolic signal, without demonstrating greater overall energy expenditure or a body-weight benefit.
This was a pilot study with withdrawals, and the abstract provides no numerical effect estimates or confidence intervals. The authors say the fat-oxidation finding needs confirmation as a primary outcome.
What researchers found
Increase in energy expenditure after meals
Boysenberry juice versus placebo after each 4-week intervention; the abstract reports no effect estimate.
What the trial tested
Participants received both beverages in separate intervention periods. The main question was whether boysenberry anthocyanins changed diet-induced thermogenesis, meaning the increase in energy expenditure after eating. Skin temperature over brown-fat regions also showed no significant change.
A separate fuel-use result
The increase in fat oxidation suggests a possible change in fuel use after a meal; it does not establish weight loss. The authors requested studies that make substrate utilization, particularly fat oxidation, the primary outcome.
The original publication
Effects of boysenberry on postprandial energy metabolism in healthy adults: A randomized controlled crossover trial.
Furuuchi R, Kato S, Maejima D et al.
PLoS One · 2025
- PubMed ID
- 40844985
- Record checked
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