World Diet Initiative

The World Diet Initiative (WDI) is a global research consortium, launched in July 2026 by researchers from 12 countries and introduced in Nature Medicine, that documents and studies the world’s disappearing heritage diets before they are displaced by the global nutrition transition toward uniform, industrially processed “Western-style” diets. Operating through the World Diet Atlas, an open resource mapping how heritage foods are sourced, prepared, and consumed, and the World Diet Project, which applies harmonized methods to examine how long-term dietary exposures shape immune, metabolic, and microbiome biology, the WDI is structured as a locally-led consortium in which regional partners retain ownership of their research.

For the field of nutritional psychology, the WDI offers a rare cross-cultural evidence base linking heritage dietary patterns to the microbiota–gut–brain axis, food-related behavior, and the psychosocial dimensions of eating — extending the diet–mental health relationship beyond Western populations and reinforcing the cultural, sensory, and identity-based contexts in which food shapes the mind.