Keeping Secrets

2026-02-02 - source - Read full transcript

Shankar Vedantam (host)Leslie John

Key insights

The dominant public fear is oversharing (TMI), but John's research says the underrated risk is TLI - too little information - which causes real, measurable harm that gets ignored.

John argues that public discourse is fixated on outing people for TMI moments while treating silence as a safe default. Her research reframes disclosure decisions as a two-sided tradeoff: both oversharing and undersharing carry real costs, and the costs of staying silent are systematically underweighted.

self-disclosure

About 80 percent of patients admit hiding pertinent health information from their own doctors, sometimes with life-threatening consequences.

John cites two hospital cases: a doctor who nearly performed unnecessary appendix surgery until he pressed a patient hard enough to admit methamphetamine use that mimicked appendicitis symptoms, and a surgeon who had to repeatedly press a mother before learning her daughter was taking weight-loss supplements that were interfering with the daughter's ability to stop bleeding during surgery.

secrecy-costs

Keeping a secret is a cognitively active, effortful process, not a neutral state, and it carries measurable physiological and cognitive costs.

John explains that secret-keepers must constantly monitor conversations for moments the secret could surface, which is stressful enough to raise cortisol levels. Research she cites also shows people score lower on IQ tests while actively holding a secret, because it occupies working memory.

secrecy-costs

People consistently prefer a 'revealer' who admits something bad over a 'concealer' who simply opts out of answering, in both hiring and dating scenarios.

In John's studies, participants chose between a candidate or date who admitted to something negative (e.g. being reprimanded at work, filing a false insurance claim) and one who chose not to answer the same question. Revealers were preferred even though they'd admitted the worse fact, because concealment reads as a global signal of untrustworthiness.

trust-and-relationships

The 'impact bias' - overestimating how long an emotional event will affect us - pushes people toward silence by inflating the expected cost of honesty.

John explains that people overestimate both how long bad feelings (like the fallout from disclosure) and good feelings (like a raise) will last. Applied to secrets, this means people imagine the fallout from telling the truth will be more intense and longer-lasting than it typically turns out to be, biasing the decision toward concealment.

regret-and-bias

Short-term regret favors things we did, but the pattern flips over a lifetime: long-term regret is dominated by things we didn't do or say.

John cites Thomas Gilovich and Victoria Medvec's research showing that immediately after an overshare, people regret the 'sin of commission.' But over years and decades, the dominant regret becomes 'sins of omission' - missed disclosures and unexpressed feelings - a pattern she connects to Bronnie Ware's hospice observations, where four of the five most common deathbed regrets are about things left unsaid or undone.

regret-and-bias

New relationships form through reciprocal, escalating self-disclosure, and a single unmatched disclosure can permanently dampen a potential friendship.

John describes an elevator encounter at an academic job fair where she admitted feeling exhausted and the other candidate responded with forced enthusiasm instead of reciprocating. She calls this a 'reciprocity fail' and says the awkwardness has kept her from ever trying to connect with that person again, despite years of seeing him at conferences.

self-disclosure

Secrets feel uniquely shameful because they're invisible, and social media's curated self-presentation compounds the false sense of being alone in holding them.

Because people don't see the secrets others are carrying, they assume their own secret is unusually shameful or rare, even though research (John cites work by Michael Slepian and Malia Mason) finds common secrets are widely shared. She argues social media worsens this by presenting a curated, glamorous version of other people's lives for comparison.

secrecy-costs

Partial disclosure can be more damaging than either full honesty or silence.

John tells the story of 'Jennifer,' who called her mother 'Donna' with pre-wedding doubts and was reassured by a story that implied Donna's marriage was simply stable and happy. Years later Jennifer learned her parents had an open, non-monogamous arrangement that Donna never mentioned on that call. Jennifer felt the half-true reassurance shaped her decision to marry, and that a fuller or even absent answer would have been better than the misleading partial one.

trust-and-relationships

How a question is asked changes how honestly people answer it - the same sensitive questions get far more honest answers on an anonymous survey than they would face-to-face.

John describes a set of 'have you ever...' survey questions (ranging from littering to infidelity to filing false insurance claims) that she and her doctoral advisor found awkward even to write. Yet respondents answered them candidly on a pseudo-anonymous online survey, done at home without anyone watching, which John says shows disclosure is shaped as much by context as by personality.

self-disclosure

Books referenced

Revealing: The Underrated Power of Oversharing - Leslie John - John's own book, drawn on throughout the episode as the source of her research on self-disclosure, self-concealment, and the TMI/TLI framework.
The Top Five Regrets of the Dying - Bronnie Ware - A hospice nurse's collected observations of what dying patients most regret; four of the five regrets are about things not said or done, which John cites as evidence that omission dominates long-term regret.

Media referenced

Mr. Bean - show - John opens with the sketch where Mr. Bean hides raw steak tartare around a restaurant rather than admit he can't eat it, using it as a comic parallel to her own story of eating a dish she was too embarrassed to refuse at a dinner party.

Techniques and frameworks

TMI vs. TLI framework - John's reframe of oversharing risk: public discourse obsesses over 'too much information' (TMI) moments, but underweights the real, measurable harms of 'too little information' (TLI) - staying silent when disclosure would have helped.
Impact bias - The tendency to overestimate how long an emotional event, good or bad, will affect us; John argues it biases people toward concealment because they overestimate how much and how long honesty will hurt.
Sins of commission vs. sins of omission - Research by Thomas Gilovich and Victoria Medvec: short-term regret favors things we did (a disclosure 'hangover'), but long-term regret flips to dominate on things we didn't do or say.
Reciprocal self-disclosure - The 'ping-pong' pattern by which new relationships form: one person discloses something modestly vulnerable, the other matches it, and the exchange escalates; a 'reciprocity fail' is when one side opens up and the other doesn't match it.

Summary

This is the first half of a two-part Hidden Brain series on secrecy, an extended conversation between Shankar Vedantam and Harvard Business School psychologist Leslie John, author of "Revealing: The Underrated Power of Oversharing." John opens with a comic parallel: a Mr. Bean sketch where he hides raw steak tartare around a restaurant rather than admit he can't eat it, which she connects to her own story of choking down the same dish at a dinner party rather than embarrass herself in front of two senior academics. From there she lays out her central argument: public discourse obsesses over the dangers of oversharing (TMI), but systematically ignores the real, measurable harms of undersharing, which she calls TLI, too little information.

Much of the episode catalogs the costs of concealment. John cites research finding that roughly 80 percent of patients admit hiding pertinent information from their own doctors, illustrated with two hospital stories: a doctor who nearly performed unnecessary appendix surgery before a patient admitted to methamphetamine use, and a surgeon who had to press a mother repeatedly before learning her daughter's weight-loss supplements were interfering with her ability to stop bleeding during surgery. Beyond medical risk, John explains that secret-keeping is not a neutral, passive state but an active cognitive burden: constantly monitoring conversations for moments a secret might surface raises cortisol and measurably lowers performance on IQ tests. She also describes controlled studies where participants consistently preferred a "revealer" who admitted something negative over a "concealer" who simply declined to answer the same question, in both hiring and dating scenarios, because concealment reads as a broader signal of untrustworthiness even when the revealed fact is worse.

John then turns to why people conceal despite these costs, pointing to cognitive biases that distort the calculus. The "impact bias" leads people to overestimate how long the emotional fallout from honesty will last, inflating its perceived cost relative to silence. She also draws on Thomas Gilovich and Victoria Medvec's research showing that short-term regret favors things we did (an overshare "hangover"), but the pattern flips over a lifetime: long-term regret is dominated by things left unsaid or undone. John connects this to hospice nurse Bronnie Ware's "Top Five Regrets of the Dying," where four of the five most common deathbed regrets involve unexpressed feelings or paths not taken. A personal scare with her own mother collapsing after a bout of food poisoning pushed John to write and give her mother a "love list" rather than continue holding back affection she'd assumed she had time to express later.

The conversation also explores how relationships and social comparison shape disclosure. John describes new relationships forming through reciprocal, escalating self-disclosure, a "ping-pong" pattern, and recounts a "reciprocity fail" from her own life: an elevator moment at an academic job fair where she admitted feeling exhausted and the other candidate responded with forced enthusiasm instead of matching her vulnerability, a small failure to reciprocate that has kept her from connecting with him at conferences ever since. She also tells the more consequential story of "Jennifer" and her mother "Donna," where a partially honest, reassuring phone call before Jennifer's wedding, one that omitted Donna's own open marriage arrangement, may have shaped Jennifer's decision to marry a man she later divorced; Jennifer felt the half-truth did more damage than either full honesty or silence would have.

John closes by noting that secrets feel uniquely shameful because they're invisible: people assume their own secrets are unusually shameful because they can't see how common similar secrets are in others, a distortion she says social media's curated self-presentation makes worse. She also points to a methodological detail from her own research career: sensitive "have you ever..." survey questions, covering things like infidelity, false insurance claims, and tax cheating, that felt excruciating even to write, nonetheless got candid answers when asked anonymously online rather than face-to-face, underscoring that context and framing shape honesty as much as personality does. The episode closes with a call for listener voice-memo submissions and a pointer to next week's follow-up episode, "Coming Clean."

Notable Quotes

"There are very real harms to not opening up, to staying silent." - Leslie John

"Keeping a secret is not an inner activity, it's not a neutral thing, yet we often think that that's a neutral thing." - Leslie John

"The preference for a revealer is driven by a global character judgment. The person who conceals is not to be trusted." - Leslie John

"What we end up regretting much more over the course of our lives, the things that we didn't do, the sins of omission, the things that we didn't do that we should have done." - Leslie John