Ebook Download , by Rob R. Dunn
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, by Rob R. Dunn
Ebook Download , by Rob R. Dunn
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Product details
File Size: 1075 KB
Print Length: 309 pages
Publisher: HarperCollins e-books; Reprint edition (June 21, 2011)
Publication Date: June 21, 2011
Sold by: HarperCollins Publishers
Language: English
ASIN: B004MMEIHS
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Amazon Best Sellers Rank:
#532,885 Paid in Kindle Store (See Top 100 Paid in Kindle Store)
Dunn’s book addresses a host of intriguing questions such as:-Why are there diseases that disproportionately attack those in the richest parts of the world while being almost non-existent in poor countries?-Why is obesity at epidemic proportions among modern humans?-Why—while people have diverse tastes overall—do there seem to be universal preferences for sweet, salty, and fatty foods?-Why are so many people’s lives wrecked by constant stress and worry?-Is the Appendix really a vestigial organ with no apparent purpose?As the subtitle suggests, this book is about the role that other species have played in human evolution and the way we look, behave, and think today. The message of The Wild Life of Our Bodies is that humanity’s proclivity to see itself as an island--uninfluenced by other species--has its cost.The book is popular science--approachable to a layman but with the usual disdain for gratuitous assertions and shoddy reasoning that define the scientific though process. That being said, Dunn does put some editorial opinion out there in ways that might appear as fact in a slipshod reading. The most prominent example being Dunn’s suggesting that what best defines humanity is not our intelligence or ability for abstract representation (or even our physical appearance), but that we are the only (first?) species that has killed other species off not purely of self-defense or for food, but to exercise control over our ecosystem. I doubt this would strike a majority of impartial scientists as a fair and unbiased way to define humanity. Granted, this point not what The Wild Life of Our Bodies is about, and whether one thinks this it is fair or not is not critical to whether one will find the book to be of value. However, the idea (and the fact) that humans have zealously killed off other creatures is certainly relevant to the discussion at hand.If “terraforming†is the term for how an alien race might environmentally engineer Earth to make it suitable for them to live here, perhaps we could call humanity’s assault on other species “bio-forming†of the planet—choosing a roster of species that strikes our fancy. All the time humans were trying to make ourselves more comfortable by getting rid of inconvenient species, we remained ignorant to the downside.Dunn covers a broad range of mismatches between who we are evolutionarily and how we live in the modern world. “The Wild Life of Our Bodies†suggests that, like the pronghorn antelope, humans are in many cases overdesigned because of the loss of species (parasites, predators, symbiotes, etc.) that helped to make us who we are today. (One question that once puzzled biologists was why pronghorns were so much faster than every species they faced.)While it sounds good to be overdesigned (at least relative to the alternative), it’s not without cost. In our case, we had guts that were supremely adapted to having parasites, but the lightning fast (on an evolutionary timescale) elimination of those parasites has left us with bodies that attack a non-existent enemy and this has resulted in a number of new diseases. We are used to diseases that succeed in the poorest—and, hence, least hygienic areas-- but disease that mostly attacked in the cleanest places on Earth have puzzled us for some time. Crohn’s disease is a prime example. “Rewilding†(i.e. putting parasites back into) the guts of Crohn’s patients has shown positive results.Dunn lays out a couple of the theories as to how the loss of our intestinal bacteria may result in a number of first-world ailments. Interestingly, some of these diseases aren’t even digestive in nature, and might seem to have no logical connection to gut bacteria. However, our body’s systems are a system-of-systems—i.e. they are integrally linked. One issue is that some parasites have been able to mask their presence, and our bodies have learned to present a heightened response to account for this veiled threat. Today our systems can’t tell the difference between our squeaky clean guts and a gut full of these sneaking parasites so it drops the immune system version of an A-bomb.This is one example of why some diseases don’t exist in the third-world where the body knows what parasites it’s up against. One might say, “Yes, but these ailments of over-reactive systems can’t be as bad as the effects of the parasites.†That’s often not true. Most people with internal bugs (we all have them to some degree), don’t even realize it. The fact that people with Crohns’ are willing to have predators implanted in them speaks to this issue.There has been concern for years about downside of the rampant use of anti-bacterials, antibiotics, and antiseptics, and this is a topic Dunn addresses as well. For example, there seems to be little evidence that such agents in soap do any particular good, but they decidedly do bad (encouraging drug resistant species.)Perhaps the single greatest change in the nature of homo sapiens life resulted from the agricultural revolution, and Dunn delves into how this seminal event changed our bodies. With paleo-dieting all the rage, it will come as no surprise that there have been some major changes to the human diet since our hunter-gatherer ancestors roamed the Earth. Once again, we have bodies built on an evolutionary timescale, and they don’t necessarily cope well with our new diets.One problem is that we have strong hardwired drives for foods that were a rarity in our species’ past, but which we now produce in abundance. For example, we eat far too much refined sugar because our bodies are wired to love sweet, but that kind of food was rare to our pre-agricultural ancestors. Hence we have the existence of diabetes, and its greater prevalence where high-sugar diets are common. Many people are also saddled with an evolutionary advantage to store fat because their ancestors come from a clime where food was not abundant year round. The problem is that now there’s a grocery store on every corner and this once great advantage is contributing to burgeoning waistlines.I gave this book a high rating on the grounds that it presented a lot of food for thought, and that’s what I most value in non-fiction. Some of the theories may turn out to be incorrect, but this book offers one a lot to think about and clear explanations of the bases for what can otherwise seem a little outlandish. There is also some wit in places that contributes to heightened readability.
This book examines what are lives are like without the various species we evolved with. In a lot of cases we face issues we never had to face with them. There are plenty of things to think about when reading this book.After an introduction in part one, part two explores why we might be afflicted with Crohn's Disease and other auto-immune diseases in the developed world, but not in other parts of the world. The answer very well might be that we in the modern world with its cleanliness and health care are missing the worms that infect the rest less fortunate part of the world. Less fortunate in the sense that they live without what we have come to rely on and aspect. If we factor in their lack of Crohn's Disease and its like, the matter might not seem so clear. One scientist wondered about our lack of worms, and if it could be responsible for these diseases. In an actual clinical trial Crohn's patient were given a benign species of hookworms, and most of those given the worms either improved or went in to remission. The reason that auto-immune diseases are prevalent might be that without the worms in our bodies for the immune system to fight it attacks our own bodies. Of course, there is a lot more research needed to provide that direct link. It's possible that there could be alternative explanations, or it might be only a part of the explanation.The next part covers the trillions of bacterica that live in and on us. Research has shown that a lot of the bacteria in our guts are beneficial. These bacteria help us digest fiber and play a role in our immune system. Other research has shown a correlation between low fiber diets and colon cancer. The appendix is discussed as being a beneficial organ, long thought to be a relic and useless. Studies have shown that a particular antibody we have actually benefits good bacteria in our appendix. In the developing world where the incidence of appendicitis is rare the appendix replenishes their guts with the good bacteria that live in the appendix after a bout with common diarrheal diseases. Without the need to repopulate our guts in the developed world the appendix can become blotted and rupture, sending the bacteria into the body cavity where it can have deadly consequences. Again more research is needed to improve our understanding of our interaction with the bacteria that could be considered a part of us.Part four covers how domestication of plants and animals have changed us. For me there was not much of interest in this part, except for lactose intolerence was reverse in cultures that domesticated cows and other milk producing species.The subject of part five is the relationship we had and now have with predators. There is a theory that poisonous snakes are responsible for our excellent color vision. In other primates, the better the vision, the more poisonous snakes were in the environment. There are other explanations for color vision, such as the ability to spot nutritious fruits. The modern plague of anxiety disorders may involve a misdirection of fear from predators we used to come across with some frequency.In part six the creatures that live on or did live on us are discussed. There is a theory that our hairlessness, which evolved in relation to lice, ticks, and other bugs that dine on our blood, has led to xenophobia. This theory could be a stretch, but is plausaible. Our hairlessness has also led to our being prone to skin cancers.The final part is on how we could make are city environments more like those we evolved in. Massive rooftop gardens and whole vacant buildings acting as natural cliff environments, which are thought to be part of our evolutionary environment. This section I view as pie in the sky type thinking. Although I believe we need people to dream big, because good things have often come with those dreams and people.The book as a whole is pretty good. It was for the most part interesting throughout. I like the fact that the author presents experiments that support the various theories proposed in the book. The author also did not actually do any of the experiments or propose any of the theories explained in the book. But, like a good scientist he assesses the different theories and their weaknesses, which all of them basically had.I would recommend the book for those interest in our evolution with other species in our environments, and what might be the result of not having them in our environment anymore. Like I said the author is careful in presenting the facts, based on experiments, and the proposed theories. This should be appreciated by readers who value honesty by an author in presenting hers or his ideas. I think it is incumbent upon an author to present known and possible problems with his or hers ideas being presented.
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