That's interesting-- Curly Girl claimed that shampoo was unnecessary, but a brief experiment seemed to imply that not using shampoo left my hair feeling nasty. It's possible I didn't run the experiment long enough.
I think the gland output varies from person to person. I think some people have glands that will back off if you stop shampooing, but some people's don't.
This is the public group instrumental rationality diary for May 1-15.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating!
Next diary: May 16-31
Immediate past diary: April 15-30
Rationality Diaries archive