Would you have survived in the middle ages?
shamusyoung.com
shamusyoung.com
Toxicity is likely to be higher then, open or no sewage systems, very low hygiene (people didn't bathe, lots of animals) and remember they used woodstoves in side the house!
The biggest impact is childhood (and prenatal) nutrition and basic sanitation. So if you did get sent back to the middle ages, the diseases would be much less likely to kill you as you are generally much more robust as a result of your late 20th century upbringing, and you'd be less likely to get them as you would understand how they spread e.g. avoiding drinking water with human excrement in it. And of you course you didn't die in childbirth or shortly after, by conveniently being in a different century, which will put you above average in life span too.
And the big message from the book: avoid the doctors. They would actively be weakening you via bleeding, laxatives and emetics, right up until about the 1920s.
Are you serious? You don't think living in a tiny room with 10 family members and all kinds of animals (along with all of the lice, fleas, diseases, etc. that go along), with a wood fire filling the whole place with eye-stinging, lung-choking smoke, was a "toxic environment"? You'd be eating mostly grains, with very occasionally some meat, and if it spoiled you'd still figure out some way to eat it, because otherwise you'd be going hungry altogether (and that would happen anyway, in poor harvest years). The water would be whatever you had nearby, probably infected with all kinds of pathogens from the excrement that would inevitably wind up there. You'd maybe have a sweat bath or sponge bath once every week or two if you were lucky, using the same water for the whole family. You certainly wouldn't have more than a few changes of clothes, which you'd wear for days or weeks at a time.
I suggest you spend some time with rural peasants in a developing country before arguing about toxic environments or nutrient-deprived food.
This is just a simple example of how bathing/changing clothes can affect your health. In the middle ages, you would have been walking in pathogen soup in all those dirty, sweat/urine/etc laden clothes you couldn't change out of.
Don't discount the impact of simple cleanliness. Pristine countryside? Doesn't exist. Go travel to one of those beautiful vistas you see in paintings, untouched by humanity and drink the clear stream water. Then spend the next few days doubled over in pain from all the parasites that live in the water, having arrived there from animal feces.
Nah, in the middle ages you'll be drinking whatever water is in your village's stream or watering hole, and you'll be glad for it too, after you carry it half a mile on your back to your house. If that water gets contaminated with cholera, you'll blame the sickness on the wrath of an angry god, or perhaps a jealous neighbor who witched you.
> Bathing [...] is not that important for health.
What???
"I wanted to ask for survival tips in case I am unexpectedly transported to a random location in Europe (say for instance current France/Benelux/Germany) in the year 1000 AD (plus or minus 200 years). I assume that such transportation would leave me with what I am wearing, what I know, and nothing else. Any advice would help."
http://kottke.org/08/06/survival-tips-for-the-middle-ages
Jason even opened it up for comments.
For example, I could not build a steam engine, but I know enough to describe how one could build a basic atmospheric steam engine, and that to improve upon it, you'd need to separate the condensation of the steam from the rest of the engine.
But I guess I would have a lot of problems, convincing any sane medieval person to take my ideas seriously.
Wash your hands before eating; boil the water before drinking; put toilet facilities downstream of drinking water; cover open wounds and keep them clean.
In short, you already know about the biggest contribution to human health: Just Stay Clean. Everything else is icing on the cake.
BTW, site shows http 403.
Humans have long been evolving in response to patterns of human behavior and technology. We're already partly artificial, so why not make it the artificiality we want, rather than the one we got by accident?
Try proxy server. Any anonymous US proxy works for me. They seem to have crazy IP (spam?) filters that block many legitimate providers, including mine.
Evolution is no more than genetic drift within a population through reproduction and variation shaped by selective pressure. What you describe as gene therapy could be seen as a selective pressure. But there are many selective pressures on large populations of humans and these selective pressure vary from one set to another. I do agree that the dynamics of selective pressures has changed for humans thanks to modern medicine. But I contest it still applies.