Science Weekly Are we hardwired to commit ‘deadly sins’?
Jan 7, 2025
Guy Leschziner, a consultant neurologist and sleep physician, dives into the biological underpinnings of what we consider the 'deadly sins.' He discusses how sloth isn't just laziness but a biological response, emphasizing the brain's role in fatigue. The conversation also uncovers the complex links between appetite and envy, revealing genetic influences on gluttony and the impact of social networks on obesity. Leschziner even touches on the controversial 'warrior gene' and its connection to aggression, challenging our notions of morality and free will.
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Extreme Sloth Case Study
- Guy Leschziner discusses a patient who slept 20 hours daily after his child's birth.
- Further examination revealed he was only truly asleep for eight hours, demonstrating an extreme form of sloth.
Sloth's Survival Value
- Sloth, often viewed negatively, can be crucial for survival.
- It prevents unnecessary calorie expenditure and allows for rest and healing during illness.
Origin of Fatigue
- Physical tiredness originates in the brain, not the muscles.
- Studies show blocking signals from the motor to sensory brain areas reduces fatigue.
