Stephen Bartlett — Entrepreneur and host of The Diary of a CEO podcast; delivers a solo deep-dive on the science of habits.
The gist
In this solo episode, Stephen Bartlett shares everything he learned from weeks of reading research on the science of making and breaking habits. He explains the neurological habit loop (cue, routine, reward) using the famous MIT rat-maze experiments, showing that old habits are never truly erased, only replaced. He lays out five evidence-based rules: keep stress low, know your cues, replace habits rather than stop them, find a stronger intrinsic reason, and recognize that willpower is a finite muscle. He closes with a bonus sixth rule on the question-behavior effect and personal stories, including how his father quit smoking after reading a book Stephen accidentally left behind.
Big reveals
- Once habits are formed they are encoded in the brain forever and can never be fully removed, only replaced.
- In the rat study the original habit had never really been forgotten; the brain can instantly toggle back to an old habit.
- Rule one: stress is your puppet master, and keeping stress low is critical for forming new habits.
- Rule two: know your cues, and major life changes like moving cities are ideal moments to break old habits.
- Rule three: don't focus on stopping bad habits, focus on replacing them with a new action.
- Rule four: you need a better, intrinsic reason to quit, not a shallow extrinsic one.
- Rule five: willpower is a finite muscle that depletes, so fewer and smaller goals succeed more often.
- Bonus rule six: the question-behavior effect, asking yes/no questions, drives lasting behavior change.
Things worth remembering
- Of the 41% of Americans who make a New Year's resolution, only 9% successfully keep it by year's end.
- Six months after setting a resolution, 46% of people are still successful, versus just 4% for non-resolution goals.
- Habits are stored in the basal ganglia, a golf-ball-sized lump of tissue Bartlett calls the habit control center.
- Researchers poisoned the reward chocolate to cause nausea, yet rats still ran the same route through the maze.
- A clinical-nutrition study found high-glycemic milkshakes spiked then crashed blood sugar, triggering addiction-related brain activity.
- The Stanford marshmallow experiment tracked children 40+ years, linking delayed gratification to better life outcomes.
- Lack of sleep lowers leptin (fullness) and boosts ghrelin (hunger), promoting fat storage and poor food choices.
- A 2010 study found behavior change took an average of 66 days, ranging from 20 to 250 days.
- In the cookie-vs-radish study, radish eaters with depleted willpower quit an impossible puzzle 60% sooner than cookie eaters.
- The question-behavior effect works best when administered via computer or paper survey requiring a yes/no answer.