That photogenic cup of bubble tea may come with hidden downsides. Tapioca pearls made from cassava can absorb heavy metals like lead, and in large amounts they may slow digestion or even cause blockages. The drink is often loaded with sugar—sometimes more than soda—raising risks for cavities, ob esity, diabetes, and fatty liver disease. There are even reports linking frequent consumption to kidney stones and poorer mental health. ...read more read less