Before we go through this answer, first you need to know What is BPA means. Bisphenol A (BPA) is detected in plastic to build a well plastic.. Basically, Bisphenol A (BPA) is used for making the plastic hard to create water bottles, lunch boxes, reusable coffee mugs, and many more. Bisphenol A (BPA) is used for a long period of time, but recently a group of researchers & scientists found that BPA was responsible for our many health issues and forced the manufacturer to stop using BPA to make consumer products. The fusion of BPA is the same as our hormones’ structure. That is means when coffee mugs are heated BPA can drain into the contents of the drinks inside which is very much harmful to our immune systems