“Just one” is one of the most common self-deceptions around food. The first bite activates reward circuits, creating desire for more. Your history is the best predictor: think of the last five times you had “just one” of a specific food—if four ended with eating more than intended, “just one” isn’t realistic for you with that food.
This companion explores the “just one” lie, the history test, why some foods defeat moderation through bliss point engineering, the honest assessment questions, and the alternative: don’t start. (4 min read)