Oddly Wired
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behavior

A minor lapse leads you to abandon all progress.

The what-the-hell effect explains why one small deviation from a goal often results in a total collapse of self-control.

Once you feel you have 'broken' your restriction, the psychological distress makes you stop caring about further consequences. You treat the initial failure as a signal that the goal is already lost.

The harm is rarely in the single mistake, but in your reaction to it.

Where this comes from

Study
Janet Polivy and C. Peter Herman
What the check found
The term is widely attributed to Polivy and Herman's work on disinhibition in restrained eaters, though the provided text did not contain this information.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.