Simplicity tends to get treated as a nostalgic ideal, something people say they miss without doing much about it. Two studies that measured real bodies and real behavior, rather than just asking people how they feel about clutter and choice, suggest simplicity’s benefits are more concrete than that, showing up in actual stress hormones and in whether people follow through on decisions at all.
The clearest evidence on clutter comes from a 2010 study by Darby Saxbe and Rena Repetti, published in Personality and Social Psychology Bulletin, part of UCLA’s Life at Home project. The researchers had 60 dual-income spouses give video tours of their own homes, then coded their language for how much they described their space using cluttered, unfinished-business terms versus restful, natural terms, and tracked each spouse’s cortisol and mood over the following three weekdays. Wives who described their homes in more cluttered terms showed flatter daily cortisol patterns, a signature linked to chronic stress and worse long-term health, while wives who described their homes as more restful showed healthier, steeper patterns. Higher “stressful home” scores predicted mood that got worse across the day, while higher “restorative home” scores predicted mood that improved, and these effects held even after accounting for marital satisfaction and general anxiety-proneness. The pattern was notably weaker for husbands, an interesting wrinkle in itself.
A second study helps show that the same basic principle, less complexity functioning better than more, extends well beyond the home into how people make important decisions. In research by Sheena Sethi-Iyengar, Gur Huberman, and Wei Jiang, published as a chapter in Pension Design and Structure, the researchers analyzed administrative data covering nearly 800,000 employees across hundreds of company retirement plans, testing whether the number of investment fund options offered affected whether people actually enrolled. Each additional fund added to a plan’s menu was associated with a small but real drop in participation, and extrapolated out, every ten additional funds offered cost the plan roughly 1.5 to 2 percentage points of participation. That’s real money left on the table, including employer matching contributions people simply forfeited because the menu of choices had become too complicated to work through.
Together, these two studies point to simplicity as something with tangible, measurable upside rather than just an aesthetic preference. Saxbe and Repetti’s research shows that a cluttered physical environment tracks with a genuinely less healthy stress-hormone pattern and a mood that deteriorates as the day goes on. Sethi-Iyengar, Huberman, and Jiang’s research shows that excess complexity in a decision, even a genuinely important one like retirement savings, measurably reduces the odds that people follow through at all. Between the two, a simpler environment and a simpler set of choices don’t just feel more pleasant, they appear to produce better outcomes, physiologically and behaviorally.
It’s worth being honest about what these two studies don’t establish. Saxbe and Repetti’s research involved a relatively small sample of 60 couples, and the effect showed up clearly for wives but not husbands, meaning the pattern may not generalize equally across everyone. Sethi-Iyengar, Huberman, and Jiang’s research is specific to retirement plan enrollment, a particular kind of complex financial decision, and while choice overload has shown up in other domains too, the exact percentage-point figures reflect that specific context.
Within those honest limits, the research offers a genuinely grounded case for the joy of simplicity, not as sentimentality, but as something with real effects on stress and follow-through. A less cluttered home appears to support a healthier daily rhythm. A shorter, simpler set of choices appears to make people more likely to actually choose. Simplicity, in both cases, wasn’t a lesser option. It was the one that worked better.