One of the most popular foods during the Kin Jay festival are preserved vegetables such as kana chai. But this can be bad for your health especially if bought from unreliable sources, Dr Anadi warned: "Preserved vegetables, especially those sold in [fresh-produce] markets, can be unhygienic or contaminated. Canned products may be more reliable, provided that the cans aren't dented, swollen or rusty," she added.