Introducing wikifcd: Many food composition tables in a single knowledge base

We introduce WikiFCD, a knowledge base of structured food composition data. This knowledge base is designed to accommodate data from different regions of the world, it is multi-lingual, and it supports open participation of any interested editor. We used Wikibase to store data from multiple food composition tables (FCTs). We mapped relevant classes of data to corresponding entities in the Wikidata knowledge base in order to support querying of food composition data alongside data about chemical compounds, metabolites, biological pathways, and data about human genes. We also make use of FoodOn to provide identifiers for food items. This knowledge base contains a growing number of FCTs that provide coverage of a broad range of cuisines and food traditions. Reusing data from this knowledge base can provide greater coverage of foods for nutrient intake tools. This knowledge base will be useful for policy makers, epidemiologists, nutrition researchers, developers of food-related applications, and people interested in food tracking.