New EU Project Explores How Diet, the Gut–Brain Axis and Mental Health Are Connected

Depression, anxiety disorders and other mental health conditions are among the greatest public health challenges across Europe. At the same time, there is growing scientific evidence that diet can have a significant impact on psychological well-being and mental health. However, the exact nature of these links, the biological mechanisms involved, and how social circumstances influence these relationships are as yet only partially understood. This is precisely where the new European research project BEETHOVEN comes in, having launched on 1 September 2026.

BEETHOVEN stands for ‘Linking Brain, Environment and Ecosystems Through Holistic Omics and Validated Evidence-based Nutrition Guidelines’. Funded under the EU’s Horizon Europe research programme, the project brings together scientists from several European countries. Together, they aim to investigate how diet, the gut microbiome, environmental factors and living conditions interact, and what contribution they can make to the prevention and management of mental health conditions. The aim is to develop scientifically sound dietary recommendations that are not only biologically effective but can also be implemented in the everyday lives of various population groups.

The University of Bayreuth is playing a central role in this. Dr Tina Bartelmeß, Junior Professor of Sociology of Nutrition at the Kulmbach Campus, is leading the work package ‘Socio-Economic, Cultural, and Geographic Factors on Dietary Behaviour’. Just under 500,000 euros in funding has been secured for the research work at the university.

The Bayreuth team is focusing on a question that is often neglected in nutrition and health research: why do dietary recommendations not work equally well for everyone? Dietary behaviour is not determined solely by individual knowledge or personal decisions. It is significantly shaped by factors such as income, education, place of residence, cultural norms, family structures and access to food. These contextual factors influence not only what people eat, but also their health outcomes.

The work package led by the University of Bayreuth is therefore investigating how socio-economic, cultural and geographical factors influence the link between diet and mental health. Plans include a cross-national survey across five European countries, as well as a citizen science study in which members of the public are actively involved in the research. The findings are to be directly incorporated into the development of new evidence-based dietary recommendations.

The project’s interdisciplinary approach is an innovative one. The researchers are combining social science perspectives with clinical and pre-clinical studies, biomarker and omics research, and investigations into the gut-brain axis. The aim is to examine biological, environmental and social factors within a single research framework for the first time. The project partners hope this will lead to a significantly more comprehensive understanding of how diet and mental health are linked, and which measures can actually support people in different life situations.

“If dietary recommendations are to work in practice, we must take social inequalities and differing living conditions into account from the outset. It is precisely this perspective that we are bringing to BEETHOVEN,” says Dr Tina Bartelmeß.

The official kick-off meeting took place on 2 and 3 September 2026 at the University for Continuing Education Krems in Austria, which is coordinating the international consortium. Over the next four years, the partners will work together to establish new scientific foundations for personalised yet socially inclusive dietary prevention in the field of mental health. The project will run until 31 August 2030.