You've probably heard the statistic: "Adults make 35,000 decisions per day."
It's everywhere. Business books, TED talks, LinkedIn posts. There's just one problem.
No one can find the original study. Because it doesn't exist.
Multiple investigations have traced the citation chain. It leads to a university blog post citing "various internet sources" [1]. Those sources cite each other. None cite a primary study. Even researchers who've used the number have questioned it — Eva Krockow wrote in Psychology Today: "I do wonder how the estimate was derived in the first place."
The 35,000 figure is a myth. A number that gained credibility through repetition, not evidence.
What the Research Actually Shows
Here's what IS verified: A Cornell study by Wansink and Sobal (2007) found that people make roughly 226 food-related decisions per day — but are only consciously aware of about 15 [2]. That's a 15x gap between perceived and actual decisions, just for food.
We don't have a verified total for all daily decisions. But we do know this: we dramatically underestimate how many choices we make, and each one has a cognitive cost.
The Ego Depletion Debate
For years, psychologists believed in "ego depletion" — the idea that self-control and decision-making draw from a finite pool of mental energy that depletes with use [3].
The original evidence was compelling: a 2010 meta-analysis of 198 studies found a moderate effect (d = 0.6). But then the replications started failing:
- A 2015 meta-analysis, after controlling for publication bias, found an effect size of just 0.2 — not significantly different from zero [4]
- A multi-lab replication across 24+ labs with 2,141 participants found no evidence for the effect
- A separate 36-lab replication with 3,531 participants found d = 0.06 — essentially nothing [5]
In January 2025, psychologist Michael Inzlicht called ego depletion "the textbook example of how seductive ideas and questionable research practices can lead an entire field astray" [6].
But here's the nuance: One study found that cognitive fatigue DOES appear — but only after 4-5 hours of continuous effortful tasks. Not minutes. Hours.
The quick depletion model is dead. The long-haul fatigue model is real.
The Parole Judge Study: Real But Complicated
The most famous decision fatigue study analyzed 1,112 parole rulings by Israeli judges [7]. The finding was striking: favorable rulings dropped from ~65% to nearly 0% within each session, then returned to ~65% after a food break.
It's a dramatic image. But significant criticisms have emerged: case ordering may not have been random, and simulations suggest the pattern could be a statistical artifact.
Even so, the core observation holds: serial decision-making under pressure shifts toward the safe, default choice. Whether that's "deny parole," "prescribe antibiotics" (JAMA 2024 found physicians prescribe more unnecessary antibiotics later in shifts), or "answer the same customer question the same way you always do."
What This Means for Your Nervous System
Here's where it gets personal.
Your body doesn't distinguish between deciding on a million-dollar strategy and deciding how to answer the same customer question for the 47th time. Both activate the prefrontal cortex. Both cost glucose. Both trigger the stress response.
From burnout research: chronic cognitive demands keep the HPA axis activated — cortisol stays elevated, sympathetic dominance increases, and HRV drops. The correlation between allostatic load (cumulative stress burden) and total HRV is r = -0.67 (p < 0.001) [8].
62% of entrepreneurs report feeling depressed at least once per week. Nearly half say mental health struggles interfere with their ability to work [9].
Decision fatigue isn't an abstract concept. It's a measurable physiological state.
The Real Solution Isn't "Decide Better" — It's "Decide Less"
The ego depletion research, even in its debunked form, pointed toward something real: cognitive capacity is finite over long periods.
The implication for business owners:
- Every FAQ video you create eliminates a decision — "How should I answer this?" becomes "Here's the link"
- Every documented process eliminates a decision — "What's the next step?" becomes obvious
- Every system replaces a judgment call — automation doesn't get fatigued
The math: If each piece of documentation eliminates just 2 reactive decisions per day over 226 working days, that's 452 decisions per year you don't have to make. Per document.
A Nature Human Behaviour study (2021) found that prioritization techniques alone reduced mental fatigue by 40%. Systems that eliminate decisions entirely go further — they protect the cognitive capacity you need for the decisions that actually matter.
The Uncomfortable Truth
The "35,000 decisions" myth persists because it FEELS true. Entrepreneurs feel overwhelmed by choices. That feeling is valid even if the number isn't.
What the verified science tells us:
- We make far more decisions than we realize (15x gap just for food)
- Long-term cognitive fatigue is real (hours, not minutes)
- Serial decision-making shifts toward default/safe choices
- Chronic decision load correlates with stress, depression, and suppressed HRV
- Systems that eliminate routine decisions protect cognitive capacity
Your brain should be solving problems, not answering the same question twice. That's not efficiency advice. That's nervous system protection.
Sources
[1] Hoomans, J. "35,000 Decisions: The Great Choices of Strategic Leaders." Roberts Wesleyan University. accessibility.link.new-tab — Traced as origin of the claim; cites "various internet sources."
[2] [Wansink, B. & Sobal, J. (2007). "Mindless Eating: The 200 Daily Food Decisions We Overlook." Environment and Behavior, 39(1), 106-123.](https://journals.sagepub.com/doi/10.1177/0013916506295573)
[3] [Baumeister, R.F. et al. (2024). "Self-control and limited willpower: Current status of ego depletion theory and research." Current Opinion in Psychology.](https://www.sciencedirect.com/science/article/pii/S2352250X24000952)
[6] Inzlicht, M. (2025). "The Collapse of Ego Depletion." accessibility.link.new-tab
[7] [Danziger, S., Levav, J. & Avnaim-Pesso, L. (2011). "Extraneous Factors in Judicial Decisions." PNAS, 108(17), 6889-6892.](https://www.pnas.org/doi/10.1073/pnas.1018033108)
[8] [Stress and Heart Rate Variability meta-analysis (37 studies). Psychiatry Investigation.](https://pmc.ncbi.nlm.nih.gov/articles/PMC5900369/)