How our state of mind has a dramatic effect on our decisions

Fairness apparently has blood sugar. That is the unsettling implication of the reported parole pattern. A legal system can write majestic principles about impartial judgement, then ask a tired human to apply them repeatedly until lunch. The rule stays constant. The animal operating it changes.

We prefer to call this professionalism and move on. Professionals, presumably, have transcended hunger, fatigue, sequence and the accumulated irritation of six difficult cases. Their qualifications have lifted them beyond biology. It is a comforting idea and obvious nonsense. Less consequential decisions reveal the same fragility. The final candidate meets people whose curiosity has been spent on the previous five. A complex choice is placed at the end of a long day because it was too important to rush earlier. A support agent meets one furious caller after another, then answers the next perfectly reasonable question with irritation accumulated from everyone before it. Sequence also creates invisible comparisons. After five obvious refusals, granting parole in a borderline case can feel unusually generous; after three disastrous candidates, mere competence looks like salvation. We imagine ourselves judging each item independently while the previous item is still standing behind it, breathing heavily.

The study does not prove that food caused each decision or that every later judgement deteriorates. It does make one defence look ridiculous: “our people are experienced”. Experience cannot repeal state. Systems exist precisely because individual virtue is an unreliable control. Order can rotate. Long runs can break. Outcomes can be checked for patterns that have no legitimate reason to exist. Important cases can receive allocated attention instead of the damp crumbs remaining at 4.50pm. We spend fortunes training judgement and then schedule it like warehouse loading. If a decision matters, the condition of the decision-maker belongs inside the design.