Soy Sauce
In 2016, it was discovered that many soy sauces in China contain a carcinogen known as 4-methylimidazole, which is linked to cancer. Although the manufacturers maintained that the amount was modest, the Hong Kong Consumer Council took the matter very seriously due to the fact that it was used on a daily basis.

Soy Sauce
Tapioca Pearls
Similarly, tapioca pearls are another food product to avoid when traveling to China. Researchers discovered aspolychlorinated biphenyls in the product, a chemical that has been linked to immune system, reproductive system, neurological system, and endocrine system dysfunction, as well as the development of cancer.

Tapioca Pearls