Does Ketogenic Diet Cause Wrinkles On The Face And Yellow Teeth?

I have a niece who s been on the ketogenic diet for about six to eight months now . She has become deeply wrinkled in her face where she was not before . She is also now cussing all the time nd never did before, her teeth look bad . An she is now wearing the same size clothing as her baby sister who s always been tiny naturally an kind of tll an small boned . The Neice I m seeking who lost all ths weight etc is I d say medium boned taller than her sister and about thirty six years old . What is wrong ith her ? My husband thinks she s on meth . But she s never done drugs before . I think he s sever.y mal nourished . What s the problem ?