Dim sum is usually linked with the older tradition from yum cha (Chinese: 飲茶; Cantonese Yale: yám chàh; pinyin: yǐnchá; literally: "drink tea"), which has its roots in travelers on the ancient Silk Road needing a place to rest. Thus, teahouses were established along the roadside. An imperial physician in the third century wrote that combining tea with food would lead to excessive weight gain .