Inauthenticity can be physically dangerous. Take eating disorders for example, anorexia and bulimia.
A confused young lady starves herself in order to obtain the body of a concentration camp inmate — that weak, boyish body image much glamourised by homosexual and feminine men in the fashion industry. The young lady does not recognise how such idealised body images have overcome her, and driven her to self-flagellation. She does not realise her self-worth, freedom, and perspective as an individual — apart from the expectations of popular culture. She cannot love her life and herself, because she is trapped in a fiction where she must obtain approval from others, and that approval will never be enough.
Inauthenticity has lead to the negation of her life – physically and emotionally. It is a common story.