Why do good things stop feeling good?

Dr. Tali Sharot defines it as a diminished physiological and emotional response to a stimulus that is repeating or constant. Her first examples are sensory: within 20 minutes in a room full of cigarette smoke you cannot detect the smell, you stop hearing an air conditioner that has run all day, and cold pool water stops feeling cold. She says the same mechanism then runs on complex things — relationships, jobs, and bad events too.

Sharot's answer is that nothing needs to have gotten worse. The response fades because the thing has stayed the same. She points to a Julia Roberts interview in which Roberts describes an ordinary day of school runs and dinner as wonderful, and credits the fact that she leaves for work on location and comes back: "it's like pixie dust all over my very normal life." Sharot's framing is that you can have a wonderful life in the objective sense and not feel it, because you cannot see it anymore.

On average, happiness follows a U-shape: relatively high in children and teenagers, falling to its low point in midlife, then climbing again and staying up, which Sharot says people do not expect. She is clear that nobody knows for sure what drives it, and that the U is an average rather than a forecast for any individual. The candidates she offers are the life events that cluster in those years — children at home, ageing parents, heavy work responsibility — and sameness: the same place, the same relationship, the same job for a long stretch, any of which could be good and still has not changed.

Sharot relays Esther Perel's two findings, which she says line up with the science of dishabituation. People report being most attracted to a long-term partner after a break — a weekend, a business trip — when they come back. And they report it when they see the partner in a novel situation, talking to strangers or on a stage. Sharot adds that she and her co-author are not relationship experts; the mechanism is what she can speak to.

In Sharot's survey work at resorts, the happiest point was 43 hours in, after which happiness declined for the rest of the stay. Her suggestion is more frequent, shorter trips rather than one long one, so you collect more of those early peaks. She notes the obvious limit: that does not work if you are flying somewhere far away.

The Steven Levitt coin-toss study Sharot describes found that people who made a change were happier at two weeks and at six months. But she is careful not to oversell it. The result isolates change as one small positive term among many others that determine the outcome, and the data is an average across thousands of people, some of whom were happier and some of whom were not.

Nick asks this directly — whether adding a date night does the same work as blowing up a marriage — and Sharot does not claim an answer. She says she does not know whether Levitt's study looked at how large the changes were, and that she does not have an answer to this. What she will say is that any change puts you in a state of learning, and that we are not making enough changes in general.

Sharot says it is both, and that a mechanism present in every species is unlikely to be a mistake. It frees up brain resources for whatever is new and possibly dangerous, and it lets us recover from bad events — she notes that almost every mental health condition involves some impairment in habituation, and cites Aaron Heller's study at the University of Miami where students were asked how they felt every 45 minutes after an exam score, and those with a history of depression returned to baseline more slowly. It also keeps us moving: if an entry-level job still felt as exciting ten years in, you would not try to progress. The cost is that good things give you less joy than they should, and that cracks you have stopped noticing go unfixed.