There are a number of people in the world who eat very strange things, such as the performers who come on TV who eat things such as tube lights, etc. And it is a normal concept in books where children who use abusive language or swear words are told to wash their mouth out by soap by their parents. The taste of soap must not be very nice, which is one of the reasons why the washing out of the mouth by soap must be encouraged.
So, how is that a normal girl eats soap 5 days a week, and which is now being treated by doctors (she also apparently eats washing powder, with a funny reaction being that her body must be very clean with all the soap and washing powder that she is eating) (link to article):
Tempestt Henderson, from Florida, eats up to five bars of soap a week and washing powder as well, the Daily Mail reported here. According to doctors, the toxic compulsion is a rare medical condition, PICA, which causes an appetite for substances that are largely non-nutritive.
People suffering form PICA have been known to compulsively eat metal, coins, chalk, batteries and toothbrushes. It can often be caused by a mineral deficiency, which explains why pregnant women often crave eating coal when needing iron. The doctor gave Tempestt intensive Cognitive-behavioural therapy (CBT), to give her replacement thoughts that will prevent her from compulsively reaching for soap.