The study that claimed that apple cider vinegar on an empty stomach would have weight loss effects was withdrawn by the scientific magazine where it had been published. The BMJ (British Medical Journal) group has officially withdrawn the support for research that suggests that small doses of apple vinegar daily could help overweight or obese to lose weight.
Science rejects the effects of apple vinegar on weakening: study. withdrawn by BMJ photo shutterstock
The small clinical study had been published in March 2024 in the magazine BMJ Nutrition, Prevention & Healthand his results were intensely taken over by the media. The conclusions have aroused much interest at that time and continue to be summarized, despite the problems later reported.
In this article, readers will find out why the study was withdrawn, what errors and irregularities were identified in data and methodology, how BMJ reacted and what important lessons bring this case for nutritional research and for the correct interpretation of scientific results.
Study withdrawn by BMJ due to errors and irregularities in data
The retraction was decided after numerous question marks regarding the quality of the research appeared: the way of data analysis, scientifically unlikely, lack of confidence in the gross data, insufficient description of the methods used, but also not complying with the obligation to register the study in advance – a mandatory requirement according to the Editorial Policy.
Moreover, the use of apple cider vinegar remains useful in the kitchen, for example when seasoning salads, where it can contribute to eliminating some bacteria.
Reason to withdraw the study: Methodology problems and inconclusive data
The alarm signals initially appeared in the form of letters addressed to the editorial, and the case was analyzed by the integrity department of the BMJ. Subsequently, the study was evaluated by specialists in statistics, who tried to reproduce the results and verify the authenticity of the data provided by the authors. The result: the replication was not possible, multiple analysis errors were discovered, as well as irregularities in the data sets.
The final report, annexed to the notification of withdrawal, concludes that the information obtained from each participant would require a much more rigorous independent analysis.
“The results of the study are not reliable and should not be quoted or used in future reports”says Helen Macdonald, editor of ethics of publications and integrity of the content at BMJ Group. The authors of the study claim that the errors identified have not been committed with bad faith and support the withdrawal of the study.
BMJ explains the withdrawal of study: complex decisions and importance of transparency in nutritional research
“This withdrawal reflects our proactive approach in investigating the concerns about the published content. We will act when necessary, to maintain transparency and to correct the scientific records. We manage the complaints as quickly as possible, but it is essential that the established protocol is respected.”adds the BMJ representative.
“The investigations are usually complex. This, for example, involved a detailed data analysis and correspondence with researchers, institutions and other experts. Therefore, making a firm, correct and definitive decision.”conclude.
The context and difficulties of nutrition research
Referring to the decision to publish the study despite the lack of official registration of the clinical test, Professor Martin Kohlmeier, chief editor of BMJ Nutrition Prevention & Health, adds: “Looking back, it was a wrong decision”.
Still, he says: “The authors come from a little scientific environment represented in nutrition research, and the magazine aims to prioritize the high quality evidence, which generally come from clinical studies. These are relatively rare in nutritional research, because they can be difficult to achieve because of the large number of participants and the time needed to obtain significant results.”
Lessons from the study withdrawal: The importance of rigor and transparency in nutritional research
The conclusion of this case emphasizes how important the methodological rigor and transparency in scientific research is. Even small studies, with seemingly promising results, must be rigorously verified before being promoted or quoted in subsequent reports. Withdrawing the study of apple cider vinegar does not mean that all nutritional research is compromised, but highlights the need for clear, replicable procedures and strict respect for scientific protocols. For readers, the conclusion is clear: Diet information and “Quick solutions” They must be interpreted with caution and based on solid evidence, not on studies with methodological problems.
