>>280739365There are several reasons why eating while walking is frowned upon in Japan. First, it goes against traditional Japanese etiquette. Second, those people generally do not mind of staining others' clothes or storefront products with sauces, creams, etc. Third, they will throw trash, such as wrappers, on the street. Even in tourist spots like Harajuku, people who eat while walking may be seen as a nuisance by everyone except food vendors.