In Evolution Rx, Dr. William Meller takes a broad look at human health through the lens of the developing field of evolutionary medicine. Evolution, he asserts, was pretty smart when it put us together, and many of our current health problems can be traced to the fact that the circumstances in which we currently live vary greatly from those which our bodies adapted to over millions of years.
Take diet, for example. We evolved in environments in which food was relatively scarce, so the cravings we developed for sweet and fatty things were to ensure that we stocked up on these precious resources whenever we came across them. Nature never anticipated the easy access of high-fructose corn syrup, however, and Meller attributes our current obesity epidemic to the fact that we have simply gotten too good at satisfying cravings that at one time were crucial for our survival.
In another chapter, he takes a look at our immune system. In a direct rebuke of those offering nostrums to "boost the immune system," he points out that we currently suffer far more from problems of an overactive immune response than an underactive one. In tracing our history, he shows how our immune systems were designed to deal with far more dirt, germs and parasites than they get in our current sanitized environments, and theorizes that many autoimmune and allergy issues are due to the immune system not having enough to do. A discussion of how Crohn's disease patients who were treated with a benign intestinal parasite experienced significant recovery and a look at the numerous studies showing how kids raised in environments with animals and dirt have fewer allergies seems to support this theory.
Along a similar vein, Meller devotes another chapter to the current bugaboo of toxins. After an elegant discussion of how "the dose makes the poison," Meller argues that the food we ate 30,000 years ago was far more toxic than anything covered in today's conventional pesticides could even come close to. We evolved giant, extremely efficient livers to deal with the fact that we were constantly eating foods that had developed their own natural poisons in effort to try to keep us from eating them. A side discussion of the theory that morning sickness evolved to ensure women only ate the safest of foods during the baby's earliest development is an interesting one. Meller doesn't deny that human ingenuity has managed to come up with the occasional chemical that does genuinely harm us, but he makes a reasonable argument that the majority of the current fear over toxins is unjustified and concerns over issues ranging from mercury in fish to BPA in waterbottles are significantly overblown.
Other issues Meller addresses in this book include injuries, how we evolved to heal them, and why modern medicine can't much improve on that process, why the idea that we need 8 hours of uninterrupted sleep is a myth and what our bodies are really designed for, the importance of vitamin D and natural sun, why we really don't need to drink 8 glasses of water a day, issues relating to sexual attraction and reproduction, why the "disorder" currently referred to as ADD was so crucial to our evolutionary survival, and how genetic defects that cause serious diseases were at one time beneficial to us.
Meller concludes his discussion of each topic with a list of suggestions for how to deal with many common medical maladies from an evolutionary perspective. Many of his suggestions make a great deal of sense and appear well supported by research. Others, however, appear to have less solid scientific grounding or contradict other research I've seen. In his chapter on Vitamin D, for example, he dismisses supplements and recommends instead getting 30 minutes of sun 3 times a week. Yet others argue that those in the northern half of the US and/or who have dark skin simply can't get enough from the sun during the winter to manufacture sufficient quantities of Vitamin D internally. Applying Meller's own evolutionary perspective, I find it questionable to think that an hour and a half of sun a week would be sufficient for the manufacture of such a crucial vitamin when for most of our history we spent 12 hours in the sun every single day.
In addition, Meller's chapters on sexuality and psychology read more like oversimplified surveys of somewhat speculative theories. While I found these sections interesting, I had less confidence in what he was saying. Also, while his suggestion that we should solve our dietary problems by returning to a meat-dominant Paleolithic diet may have grounding in evolutionary theory, it's an unrealistic solution for a planet of limited resources and a population pushing 7 billion.
Overall, I found this book useful in that it effectively and logically debunks a number of common unproven ideas about human health. But I think in his effort to make what is ultimately a highly complex topic accessible, Meller both oversimplifies and overreaches. There is a lot of good information in here, but I came away from this book feeling like it was more of a starting place than the complete reference it presents itself to be.