Much of my work is interdisciplinary, and I use tools of genetic epidemiology to evaluate how by making changes in nutritional status or dietary intake we can improve health. I run several large projects, which aim to evaluate short- and long-term health effects of vitamin D. I also work actively in the field of inter-generational and life-course epidemiology, where increasingly the focus is in establishing how common genetic variations can affect dietary or other lifestyle influences on health.