[en] Stable isotope research in nutritional sciences serves as an excellent example of how collaboration between individual scientists in diverse disciplines can lead to significant scientific advances. Being a truly interdisciplinary research subject, progress depends largely on the will of mass spectrometrists as well as nutritionists to cross borders and to share their expertise. Although nutritionists became aware of the possibilities that stable isotope techniques offer over the past two decades, mass spectrometrists remain less familiar with this specific application. By expanding research activities from the development of mass spectrometric techniques for isotopic analysis to the development of stable isotope methodologies for biomedical research, a new research area is opened for inorganic mass spectrometry