Jonathan Reisman on The Human Body: Evolutionary Design, Taboos, and the Doctor's Perspective on Anatomy

Jonathan Reisman, author of "The Unseen Body," engages in a deep discussion about the human body from both an evolutionary and a medical perspective, exploring its "messy, weird, beautiful, and fascinating details." He frequently contrasts what appears to be optimal biological design, such as the incredible dexterity and utility of the human hand and the foundational role of the thumb, with seemingly less optimal designs, like the perilous proximity of the food and air tubes in the throat. The conversation underscores the fundamental evolutionary drivers of "sex and death" as the primary forces that have shaped human biology, emphasizing their role in reproduction, selection, and adaptability over millions of years.

Reisman delves into the nuances of biological symmetry versus cultural asymmetry, illustrating this with the example of the left and right hands in Indian culture, where a practical public health measure evolved into a deep-seated taboo. He also highlights the concept of the "unseen body" as a living historical record, where scars, evidence of past surgeries, and lifestyle choices leave indelible marks that tell a unique story of an individual's life, even visible post-mortem during cadaver dissection. This perspective offers a profound insight into the personal histories embedded within our physical forms.

The episode provides a unique glimpse into the medical profession, particularly the transformative experience of initial cadaver dissection and how it shapes a physician's understanding of life, death, and the human condition. Reisman champions underappreciated organs like the kidneys, which consume significant energy and perform vital, unsung functions. He also discusses the immense potential and inherent challenges of future medical technologies, such as direct-to-consumer diagnostic devices and the computational synthesis of drugs, while using the cautionary tale of Theranos to illustrate the ethical pitfalls that can arise when ambition outpaces scientific integrity.

Broader implications include an exploration of societal taboos surrounding universal bodily functions, speculating on their origins in societal rules, cultural norms, and even public health measures. The discussion touches on philosophical questions about immortality, the necessity of death for evolutionary progress and adaptability, and the continuous interplay between biology and culture. Ultimately, the conversation paints a comprehensive picture of the human body as a product of complex evolutionary forces, cultural shaping, and the ongoing frontier of medical understanding.

"most of the time the way the body works is the best solution"

"just the dexterity it gives our hands is just really amazing and it's hard to imagine a better a better tool than the human hand"

"you slip up once you laugh while eating or you speak while trying to swallow and you die from choking so it seems less than optimal"

"the thumb really is the most crucial... for your occupation in most cases to just daily life"

"millions of years of sex and death designed the human body"

"one of the strangest concepts about the human body is that kind of the aspects of it that are the most universal that we all do are the most taboo socially"

"the kidneys are an underappreciated organ... they're kind of the unsung hero of the body relegated to the back of the abdomen like some forgotten organ but they're they are great"

"everything is on the table literally in the cadaver lab but also just you know you deal with blood and piss and vomit and feces and that's kind of the medium of your craft"

"we are a tube right we start in the womb as kind of this microscopic little disc almost like a uh you know a flat bread and then we're we roll in almost like a burrito into this tube"

"most things that happen to us leave a mark uh you know as I say a kind of a story written in the language of scar"