Yo-Yo Check

Look for the pairing of overcorrection with delayed feedback that drives oscillation.

January: strict 1,400-calorie diet, weight drops fast. March: exhausted and ravenous, you swing to eating everything, weight rebounds past where you started. June: an even stricter plan. You have run this cycle three times in four years, and each swing has been bigger than the last. The pattern itself, not your willpower, is the thing to examine.

Yo-Yo Check looks for a specific pairing that drives oscillation: overcorrection combined with delayed feedback. The cue is any variable that swings back and forth around where you want it, with each swing feeling like a reaction to the last. The operation: identify the correction you apply (the crash diet), identify the delay before its full consequences arrive (metabolic adaptation and rebound hunger show up weeks later), and check whether you are sizing each correction by current frustration rather than by what is already in the pipeline. If both elements are present, the fix is not more discipline; it is smaller corrections, applied sooner, judged after the honest delay. What changes is that swings shrink instead of grow. Do not read every fluctuation as a yo-yo; normal noise around a stable average needs no correction at all, and treating noise creates the oscillation you feared.