What Entrepreneurs Can Learn from Brain Maker
You are three espressos into a Tuesday, running on a granola bar eaten standing up between calls, and you just told an investor you had a gut feeling about the deal. David Perlmutter, a neurologist, wrote Brain Maker to argue that phrase is closer to biology than metaphor. His case: the bacteria living in your gut stay in constant contact with your brain, and the food choices you barely notice while building a company, quick, processed, sugar-heavy, may quietly shape inflammation levels that affect how clearly you think and how steady your mood feels under pressure. For someone whose job is judgment calls under uncertainty, that is worth a second look.
The whole book, compressed
This edition works through 4 core lessons — take them one at a time, not all at once.
What's different for your conditions
Tap whichever ones sound like you. Nothing here is sent or saved — it's just for your own noticing.
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The core lessons, applied to you
Your gut as a silent cofounder
Perlmutter describes a communication line between gut and brain, running partly through the vagus nerve and partly through chemical signals gut bacteria produce while breaking down food. He frames the gut as an active participant constantly sending the brain information about your internal state, not a passive tube.
This pathway is well described in outline, but how much it drives any one person's mood on a given day is still being studied. Practice: next time you hit afternoon brain fog, note what you ate at your last meal before blaming workload alone.
Next time you hit afternoon brain fog, note what you ate at your last meal before blaming workload alone.
The hidden inflammation line item
A diet heavy in processed food and added sugar, the default between meetings, is linked in Perlmutter's account to reduced gut bacterial diversity and a more permeable gut lining, which he connects to low-grade inflammation that may affect brain function over time. Framed for founders, this is less about weight and more about a slow drag on the mental stamina you lead with daily.
Inflammation has many contributors, and diet is only one input alongside genetics, sleep, and stress that researchers are still weighing. Practice: swap one packaged snack in your desk drawer for fruit or nuts this week, without calling it a diet overhaul.
Swap one packaged snack in your desk drawer for fruit or nuts this week, without calling it a diet overhaul.
Operational upgrades, not another morning routine
Perlmutter's practical suggestions are unglamorous: add fiber and fermented foods gradually, cut added sugar, protect sleep, and use antibiotics only when a doctor determines they are genuinely needed. None of it requires a new app or subscription.
Gradual change is genuinely gradual, and will not produce the fast jump a founder expects from a growth experiment. Practice: pick one meal you currently rush or skip and add a single fiber-rich food to it for two weeks.
Pick one meal you currently rush or skip and add a single fiber-rich food to it for two weeks.
The frontier claims worth watching, not acting on
Perlmutter also extends this framework into more contested territory, suggesting gut health may play some role in conditions like Alzheimer's disease, depression, anxiety, ADHD, and autism. Researchers actively debate the strength and direction of these links, and none function as diagnostic or treatment guidance. For a founder under chronic pressure, the honest takeaway is narrower: gut-supportive habits may support overall wellbeing, but they are not a lens for diagnosing yourself, a cofounder, or anyone else.
Founder culture rewards fast, measurable optimization, while gut health, according to this book, moves on a slow, unglamorous timeline of weeks and months. There is also a pull toward wanting a tidy explanation, gut health, for the anxiety that sometimes comes with running a company, when real distress deserves real support alongside any dietary change, not instead of it.
Name one thing, honestly
- Where in your week do meals and sleep get sacrificed first, and what would protecting just one of them take? - How would a foggy or irritable day read differently if you considered your gut as one factor among many? - If you tried one small food change for a month, how would you know whether it mattered?
Good. Now look back at the "Try this" line under whichever lesson feels most connected to what you just wrote, and treat that as this week's actual assignment — not all 4 at once.
The practices from this edition
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Run this for seven days
Pick one meal you currently rush or skip and add a single fiber-rich food to it for two weeks.