How did food habits travel from one place to another in the process of cultural exchange?

(i) In the process of long distance cultural exchange, food habits are often imbibed by others.
(ii) For example, common food such as potatoes, soya, groundnut, maize, tomatoes, chillies, sweet potatoes, which are part of Indian food now, were not known to Indians five centuries ago. These were Brought to Asia after the discovery of America.
(iii) The noodles and pasta which are supposed to be of Italian origin were originally brought by the Arabs to Sicily.