In the end of 2018, Marcos Machado-Fragua, a PhD student from Madrid visited our Department for several months. During his stay he worked with data of the Longitudinal Aging Study Amsterdam, to study the longitudinal association between Vitamin K and frailty in older adults. Vitamin K status was based on dephospho-uncarboxylated matrix Gla protein concentrations, and frailty was based on the deficit accumulation approach (frailty index). Marcos wrote an article that was published last month in the European Journal of Nutrition (Online First). The results showed that baseline plasma low vitamin K status was associated with a greater degree of frailty and frailty risk during 13 years of follow-up.