Healthy dietary patterns, consisting of an abundance in plant based foods, are emphasized in current dietary recommendations and food based dietary guidelines because of beneficial effects on chronic disease risk including osteoporosis and fracture risk. Vegetarian diets, excluding all or some foods of animal origin are becoming more popular with the awareness of the environmental impact of foods of animal origin and especially meats of ruminant origin. Recent studies have indicated deleterious effect of vegetarian diets, especially vegan, compared to omnivore diets on fracture risk, but so far there have been few studies on this topic. Overall we aim to investigate the association between adherence to three different dietary patterns, lacto-ovo vegetarian, vegan and modified Mediterranean, and incident hip fracture risk. We will also be able to investigate the effect modification of supplement use of calcium and vitamin D. The analyses will be carried out in the Swedish Mammography Cohort (SMC) and the Cohort of Swedish Men (COSM) using data from the investigations 1987-90 (SMC) and 1997, 2009/10 and 2019.