Dietary Factors and Rheumatoid Arthritis Risk in the UK Biobank

Dietary patterns such as regular meat-eater, occasional meat-eater, pescatarian, and vegetarian; Mediterranean diet.

Dietary components, such as oily fish, dairy product, supplements, fibre, vitamin D supplements.

Frequency and intake of alcoholic beverages was measured by self-reporting the weekly frequency of different types of alcoholic beverages, e.g., the number of pints of beer/cider consumed per week and measures of spirits or liquors consumed per week were collected to assess consumption of beer/cider and spirits.

Serum 25(OH)D was measured once at baseline through a non-fasted blood draw during any season of the year.