“I know what’s healthy—I just don’t always do it” sounds humble or self-aware.

That’s rather common, but science shows people are systematically overconfident about the quality of their health knowledge.

That phrase “I know, I just didn’t do it” actually reveals a blind spot:

Overestimated the quality of the knowledge held, and

Overlooked the actions shaped by context forces …  

So, knowing a headline or some information is not the same as knowing how to apply it.