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I told a junior colleague last spring to “save her hardest call for the morning, because willpower runs out by 3 p.m.” I sounded confident-I quoted the cookies-and-radishes study from memory. She nodded, rearranged her week, and a month later told me her afternoons had not gotten any worse.
What got worse was her fifth hour of any block, morning or otherwise. I went back to look at the science. The model I quoted fell apart in 2016-I didn’t know.
Deep Dive
For years the story went: self-control is a tank, the tank holds glucose, every hard choice drains it, and by late afternoon you are running on fumes. Baumeister’s 1998 cookies-and-radishes experiment was the founding study.
In 2016, twenty-three independent labs ran the same protocol on 2,141 participants. The combined effect size was 0.04-statistical zero. A larger replication a few years later squeezed out 0.10, still tiny enough to mean nothing in practice. The tank model is, by the field’s own standards, broken.
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Here is what matters. The thing people were trying to explain-your fifth hour of judgment is worse than your first-is still real. It just isn’t fuel.
The current framing is motivational: your brain decides effortful choices are less worth the cost the longer you have been making them, and quietly starts preferring the easier option.
Marcus, a portfolio manager I know at a small firm, ran his weeks on the old model for years. Hardest call before lunch. Email in the afternoon. He still made bad calls at 4 p.m.-and at 11 a.m., if he had already been on Zoom since 7.
The pattern wasn’t time of day. It was number of judgments in a row. He changed two things: he grouped decisions into batches of about six, with a ten-minute walk between batches; and he stopped trying to save willpower across the day. Three months in, the late-week reversals dropped.
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The Antibiotic Study
The cleanest real-world test came from medicine. In 2014, a team led by Jeffrey Linder at Harvard analyzed 21,867 primary-care visits for respiratory infections. Doctors were 26% more likely to prescribe antibiotics in the fourth hour of a clinic than in the first-even for conditions where antibiotics were the wrong answer.
The pattern wasn’t hunger or low blood sugar. It was the cumulative cost of saying “no” to patient after patient.
The easy choice-write the prescription-won by hour four. If your fourth call of the morning is your hardest one, that is not a willpower problem. It is the same effect, in your inbox.
One Move
One thing worth trying this week: stop scheduling by time of day, and start scheduling by batches. Five to seven decisions of similar weight, then a real break-ten minutes away from the screen, not a tab change. Then the next batch. The break is the part most people skip. It is also the part that does the work.
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I am not sure this works for everyone-some people genuinely do think better in the morning. But if you have been blaming the clock for your bad 4 p.m. calls, the clock probably isn’t the problem. If you want the original replication paper, it lives here: https://pubmed.ncbi.nlm.nih.gov/27474142/
—Prompt N Productive—