Question about schizophrenia

"Lack of insight (called anosognosia). Those who are developing schizophrenia are unaware that they are becoming sick. The part of their brain that should recognize that something is wrong is damaged by the disease."

Is this true?
I found this on a website and I found it very odd... Schizophrenia is one of my number one fears for myself - probably number one. At first I found this comforting, but then I remember things my sister would say......

"I can't think."
"I can't read."
"I can't concentrate."

So many of the things I'm dealing with right now.... and she was definitely aware of the first symptoms of schizophrenia. When her delusions hit full force, she seemed unaware, but otherwise.........

I don't know.........................

This is becoming such an obsessive thought I don't even know what to do.