The Diary of a CEO

Harvard Professor: REVEALING The 7 Big LIES About Exercise, Sleep, Running, Cancer & Sugar!!!

In this new episode Steven sits down with the world renowned expert on the evolution of human physical activity, Dr Daniel E. Lieberman. 0:00 Intro 02:38 Why do you do this research? 03:35 Where has your work taken you? 04:34 Has your research shifted your perspective on exercise? 05:55 The biggest exercise myths 12:00 The importance of weight training 16:12 Why always moving your body is so important 19:47 Genetics vs lifestyle 24:20 Have we evolved to be lazy? 25:46 We should be preventing diseases, not medicating them 28:13 Do hunter-gatherers get the same diseases as us? 31:32 The truth about sugar 37:30 How would you redesign our society? 42:18 Should organisations force people to exercise? 48:25 What did you learn from these tribes? 50:03 Why you should do strength training on your feet 56:38 Is too much muscle bad? 01:01:46 Running myths 01:06:58 The best cardio workout 01:09:21 The best exercise for weight loss 01:15:59 Why we need more compassion around exercise 01:20:46 What is it that actually gets people exercising? 01:24:59 The last guest's question You can purchase Dr Lieberman’s newest book, ‘Exercised: The Science of Physical Activity, Rest and Health’, here: https://amzn.to/49udz2v My new book! 'The 33 Laws Of Business & Life' per order link: https://smarturl.it/DOACbook Join this channel to get access to perks: https://bit.ly/3Dpmgx5 Follow me: Instagram: http://bit.ly/3nIkGAZ Twitter: http://bit.ly/3ztHuHm Linkedin: https://bit.ly/41Fl95Q Telegram: http://bit.ly/3nJYxST Sponsors: Huel: https://g2ul0.app.link/G4RjcdKNKsb Airbnb: http://bit.ly/40TcyNr

SBSteven BartletthostDLDr Daniel E. Liebermanguest

Jul 10, 2023·1h 29m·Watch on YouTube ↗

📖 CHAPTERS

1. 1
   0:00 – 14:00

   Evolutionary Medicine And Why Exercise Became ‘Weird’

   Lieberman introduces his background in human evolution and how it led him into evolutionary medicine. He describes realizing, through fieldwork with the Tarahumara and farmers, that “exercise” as a separate activity is historically unnatural: in traditional societies, people move because they must, not for fitness.

2. 2
   14:00 – 31:00

   Debunking Myths: Sitting, Sleep, And The 10,000‑Step Rule

   Lieberman tackles popular claims that ‘sitting is the new smoking,’ that everyone needs eight hours of sleep, and that 10,000 steps is a science-based target. He explains that it’s patterns and interruptions of inactivity that matter, seven hours often beats eight, and the step benchmark was born in a marketing meeting, not a lab.

3. 3
   31:00 – 46:00

   Strength Training, Aging, And The Retirement Trap

   The discussion shifts to aging, sarcopenia, and why Lieberman personally added regular strength training. He distinguishes chronological aging from senescence and argues that humans evolved to be physically active grandparents, not retirees, with activity itself powering anti-aging maintenance systems.

4. 4
   46:00 – 1:01:00

   Genes, Environment, And Preventable Diseases

   Lieberman explains that many chronic diseases we accept as inevitable with age—hypertension, diabetes, some cancers—are in fact strongly modulated by lifestyle. He criticizes medical systems for focusing on treatment over prevention, despite the majority of cases being preventable.

5. 5
   1:01:00 – 1:17:00

   Exercise, Cancer, Sugar, And Systemic Inflammation

   The conversation dives into cancer biology, metabolism, and diet. Lieberman links high energy intake, sugar, insulin, sex hormones, and adiposity to increased cancer risk, and shows how regular activity both prevents pro-inflammatory fat accumulation and actively turns down inflammation via muscle-secreted molecules.

6. 6
   1:17:00 – 1:37:00

   Comfort, Laziness, And Redesigning A Mismatched World

   Lieberman reframes ‘laziness’ as a natural energy-conserving instinct that made evolutionary sense when food was scarce. He argues that today’s comfort-saturated environment weaponizes that instinct, and suggests policy nudges, pricing, and social programs to make healthy choices easier without heavy-handed bans.

7. 7
   1:37:00 – 1:56:00

   Björn Borg, Workplaces, And Making Movement ‘Necessary’

   A case study of the Björn Borg company in Sweden shows what happens when a CEO mandates weekly exercise. Lieberman uses it to explore the line between overreach and smart design, and how organizations can foster ‘play’ and community to boost both health and retention.

8. 8
   1:56:00 – 2:18:00

   Running, Feet, Barefoot Shoes, And Injury Myths

   Lieberman turns to running mechanics, foot health, and the belief that running ruins knees. He argues that weak, ‘casted’ feet and poor form, not running itself, drive many injuries, and outlines how minimal footwear and technique changes, if adopted gradually, can strengthen the system rather than break it.

9. 9
   2:18:00 – 2:34:00

   Cardio, HIIT, And The Role Of Exercise In Fat Loss

   The host describes his HIIT routine and social accountability group, prompting Lieberman to discuss what types and amounts of exercise support health versus fat loss. They disentangle unrealistic expectations about exercise as a fat-burning solution from its very real value in long-term weight management and behavior change.

10. 10
    2:34:00

    Motivation, Dopamine, And Compassion For Non‑Exercisers

    Lieberman closes by emphasizing the need for empathy toward people who struggle with activity. He explains that the neurochemical rewards of exercise accrue only after consistent practice, making early stages genuinely unpleasant for many, and argues that social support and non-judgmental framing are crucial for inclusive health progress.