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Ruins of the Hecang granary west of Dunhuang, near the ancient Silk Road in China. Historical trade networks such as the Silk Road carried goods and ingredients across Eurasia, exchanges whose influence may still be reflected in modern culinary traditions.
Image Credit:
John Hill, CC BY-SA 3.0, via Wikimedia Commons
Ancient Trade Routes Still Echo in the Flavours of World Cuisines
Centuries after merchants carried spices, crops and other foods across the Silk Road and maritime trade networks, traces of those exchanges may still be detectable in the way the world cooks today.
A new study analyzed more than 100,000 recipes to investigate whether similarities between modern cuisines are better explained simply by geographic proximity or by the historical routes that once connected different regions. The results suggest that past trade connectivity remains strongly associated with the present-day structure of culinary flavours.
The researchers treated cuisine as a form of intangible cultural heritage that could be studied quantitatively. They brought together three public datasets containing a total of 104,770 recipes, including collections representing 20 national cuisines and 20 regional cuisines within China. These were linked to a network of 1,507 ingredients based on the flavour compounds they share.
The team then compared this “flavour distance” between cuisines with two other kinds of distance: the physical distance separating regions and their degree of connection through 18 historical trade networks, including branches of the Silk Road, Indian Ocean spice routes, the Columbian Exchange and Manila galleon routes.
Geography did matter. Cuisines from neighbouring or culturally related regions often appeared close together in the flavour network. Chinese and Japanese cuisines, British and Irish cuisines, and Thai and Vietnamese cuisines were among the closest pairs, while some European–East Asian combinations were among the most distant.
But historical connectivity was a stronger predictor. Cuisines connected by fewer steps along old trade routes tended to have more similar flavour profiles. Even after the researchers statistically controlled for geographic distance, the relationship between trade-route connectivity and flavour similarity remained strong. Once route connectivity was included, geography itself no longer showed a detectable independent association in the main analysis.
That does not mean historical trade alone created modern cuisines. Regions connected by trade can also share climate, language, religion, migration histories, colonial relationships and modern commodity networks. The study therefore treats the result as evidence of a robust association rather than direct proof of cause and effect.
The researchers also asked whether individual ingredients preserve traces of their journeys across cultures. To do this, they identified ingredients that act as “flavour bridges”—foods that connect otherwise distinct groups within the global flavour network. Among the highest-ranking examples were black tea, coffee and soybeans, all commodities with important histories of long-distance exchange.
An intriguing pattern emerged when the researchers compared these network positions with documented histories of ingredient diffusion.
Ingredients spread relatively recently through large-scale exchange, particularly after the Columbian Exchange, often still occupied positions between different flavour communities. Tomato, cocoa, corn, potato and vanilla are examples. In contrast, ingredients transferred much earlier, including black pepper and cinnamon, had become more deeply integrated into individual culinary traditions and no longer stood out as strongly as bridges.
The tomato illustrates the process particularly well. Although it began spreading across regions around the 16th century, it still connects different parts of the modern flavour network. Anciently diffused ingredients such as black pepper and cinnamon, meanwhile, appear to have become so thoroughly incorporated into local cooking traditions that their foreign origins are no longer easily visible in the network.
This does not mean culinary assimilation follows a simple clock. The study found that results concerning the age of trade routes themselves changed depending on how historical time was represented in the statistical model. The authors therefore classify that part of the analysis as exploratory rather than a firm conclusion.
There are other limitations. The recipe collections are modern and English-language, not complete representations of entire national cuisines. Some ingredients, especially compound seasonings such as curry powder or garam masala, could not be matched reliably to the flavour database. Fully assimilated foods can also become almost invisible to the method; wheat, despite its enormous historical importance, is one example.
For heritage researchers, however, the study demonstrates a new way of approaching something traditionally difficult to measure. A cuisine is not simply a list of dishes or ingredients. It is also a set of relationships—patterns governing what foods are combined and how imported ingredients gradually become part of local traditions.
The results suggest that these relationships may preserve echoes of exchange long after the merchants, ships and caravans themselves have disappeared. Historical trade routes did more than move ingredients between regions; they helped create encounters between culinary traditions whose traces can still be measured in the flavours of food today.
Published on: 05-11-2026
Edited by: Abdulmnam Samakie
Source: npj Heritage Science
