I think that it's true that we watch our bs levels closer when we feel that there are people out there that understand and care.
But I know when people are "watching" me and what I eat I want to show them that I can do what I want.
Sometimes that means that I rebel and take an "I'll show you" attitude.
A good friend said once that we shouldn't do the "I'll show you, I'll kill me" rebellion. But that's what we do when don't test and keep track...