^^ I like the reply above. As an example I give you my mother.
She worked in the food store in a small village, so she knew almost everyone. She enjoyed very much being known and socializing, but she sort of took us kids granted. I never had any real discussions with her, she heard what was going on in school from other kids or their parents, who came to the store, not directly from me, but that wouldn't stop her from talking about me to the customers as if she knew what my opinions and thoughts were. She was fabricating another kind of life with her stories than what I felt like I was living in.
She would have had ambitions to become a teacher, but at the time her family was not wealthy enough to provide the education. Maybe if she could have directed her talents to something more fulfilling, she wouldn't have had that much need to pretend her life wasn't exactly what she had wished for.
Anyway, this has bothered me and my brother a lot, so we don't really give her much information. As she tends to turn it to something else in the end or expose our lives to others in a way we wouldn't want to. I suppose mothers are prone to doing that though.
Little decisions sounds a good advice. Some people can quit habits 'cold turkey', but some self-control could work as well. If the problem is, that one lies when responding to someone, maybe they should think first and realize, they don't always have to come up with something to say.
Maybe writing stories could be one solution? You could fabricate as much as you want to.