Living as nature intended, or Why sunlight might reduce your eczema

I often wonder how many of our ‘modern’ diseases of obesity, depression, allergies, low back pain, nearsightedness, etc might be linked to things our ancestors did that we don’t, or vice versa. The following are my speculations on this theme.

It’s not ‘genetics’ when health changes across an entire population

Anytime we see a population-wide increase in a certain condition we should assume it’s due to an environmental factor, despite in-group genetic variation. Yes, you might be more likely to have glasses if your parents did, which may be nature or nurture, but if the entire population of Europe has gone from a near-sightedness rate of 15% to 50% in 100 years, you can be 100% sure that’s due to a change in environmental since our genes only change at glacial speed. (In the US, I could only find the change from the early 1970s to early 2000s: 25% – 42%, a huge jump in a single generation!)

Positive changes in environment with respect to health have happened as well thanks to modernity, like improved nutrition for children. This can be seen in the massive increase in human height in developed countries in the last 100 years:

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Above: “Over the last two millennia, human height, based off of skeletal remains, has stayed fairly steady, oscillating around 170cm. With the onset of modernity, we see a massive spike in heights in the developed world.”

Examples of living against nature that lead to problems

Sunlight as a necessary nutrient

Getting frequent, incidental sun exposure, tailored to the climate in which your genes developed, is one of those things that I predict will be linked to many positive health outcomes, and the absence of which leads to bad outcomes. This might be the case for those with eczema. (If you suffer from eczema, try getting more sun for a while and tell me if you see any improvements!)

Another example of the benefits of sunlight, in addition to Vitamin D, might turn out to be eyesight: there’s mounting evidence that it’s lack of sunlight, or perhaps lack of being outside and seeing things far away, that has contributed to the epidemic of near-sightedness. Either way, spending a lot more of our time outdoors would surely benefit us on many levels.

One simple solution for children would be teaching certain elementary school classes outdoors (gym would be a natural candidate) or holding lunch outside when weather permits. I read a study that showed that even just 30-60 minutes of extra outdoors exposure per day could dramatically reduce the rate of nearsightedness in children.


The common, baseless wisdom on allergies used to be that children should avoid certain foods, dust, or animals for as long as possible. We now we know  we should do the exact opposite: expose kids early on to these benign compounds that become allergens (e.g.: peanuts, dogs & cats.) This early exposure seems to teach our bodies that these things are safe and shouldn’t trigger an immune response. Households with dogs (most beneficial) and cats have children with healthier immune systems.

From an evolutionary perspective this makes sense: things your community ate and had been eating for millennia probably wouldn’t hurt you, and you would probably eat them as soon as you were weaned off breastmilk. (I haven’t googled this yet, but I’d bet that babies ‘learn’ that foods their mother eats while pregnant and during breastfeeding won’t hurt them either, and might prevent allergies that way too. We know that food preferences are passed to in-utero babies, so this speculation seems reasonable.)

Low-fat/high-refined-carb diets

The dietary wisdom around avoiding fat, particularly saturated fat, was also unscientific, against human history, and harmful. Gary Taubes and Nina Teicholz have argued this convincingly. This ‘common wisdom’, which really only started in the 1960s and 70s, is being slowly reversed through high-quality randomized controlled trials as well as personal experiences too numerous to ignore, although the medical & ‘nutrition’ fields are very slow to change their prevailing ‘wisdom’ that fat is bad for you.

If you’re trying to lose weight/keep from gaining weight as you age, I strongly recommend cutting out sugar (which includes the malt sugar in beer, sadly) and refined carbs as much as you can, and consider trying Atkins/keto for at least a month or two, and perhaps for life at some tradeoff between fitness and food pleasure that works for you. I have swung too far on the food pleasure side this past year, packing on 10 pounds more than I usually carry… Time to cut the sugar and carbs back down!

Nike shoes and high heels

Modern cushioned, constrictive, and heeled footwear is another example which is probably at least partly responsible, along with our sedentary lives, for some debilitating physical problems including bunions and knee/lower back problems. This is because modern shoes encourage bad biomechanics and poor posture. Solve this problem early by keeping your kids barefoot/near-barefoot and out of modern shoes for as long as possible, preferably their whole lives!


Above: Can you tell which kid grew up running barefoot? It’s the one who isn’t damaging his knees with each step…

I’ve had knee pain since my late 20s and switched to Xero Shoes a few years ago for both shoes and sandals. Sadly, I didn’t do this until my mid-30s, after the damage was likely done over many years of bad biomechanics while playing basketball and squatting incorrectly… I still have knee pain from time to time, but the better footwear has caused me to be more aware of not heel-striking which helps a lot. The muscles in my feet got noticeably stronger as well during the first 1 – 3 months of wearing zero-drop, low-cushion, wide toe-box shoes, which was exciting.

If you do make the transition, which I highly encourage, take it slow. Start by walking a little bit each day in your barefoot shoes (or just barefoot around the house if you wear shoes or slippers indoors), then add more intense activities over time. I would say it took at least 2 – 3 months before I stopped becoming aware of the fact that I was wearing barefoot shoes, so give yourself time to adapt from a lifetime of poor footwear.

Try to replicate a natural environment for your body and mind by default

My general rule of thumb, which I’ve adopted from Nassim Taleb, is to question the perceived wisdom when it goes against what our bodies were naturally doing for 10s – 100s of thousands of years. Mother nature is an excellent distiller of good ideas on what works from a survival perspective.

[W]hat Mother Nature does is rigorous until proven otherwise; what humans and science do is flawed until proven otherwise.  – Nassim Taleb

For me, this means (ideally…)

  • eating a low-sugar/low-refined carb diet with plenty of fat, and not eating until hungry, sometimes introducing wide gaps between meals (e.g.: intermittent fasting, which is most easily done by skipping breakfast)
  • avoiding smoking & tobacco, and absolutely no hard drug use (hallucinogenics seem ok generally, but do your homework. I’d bet heavily on edible marijuana being safer than alcohol in the long run, but just my guess.)
  • minimizing alcohol consumption
  • wearing flat, flexible minimalistic footwear
  • lifting heavy things with the right form/putting ‘loads’ on my body regularly. Backpacking, or even just walking, yard work, cooking, carrying your children, and DIY projects are great for building this into your everyday life.
  • Exposing myself to normal stressors like hunger, heat and cold (turn off the A/C, turn down the heat), sleeping on a firm surface on the ground (try the floor with a camp mat), walking on uneven paths vs flat, paved surfaces, and carrying/lifting heavy things. Try to use your body’s power as much as possible vs that of a machine. Hand tools and DIY are good for this (I love my Fiskars push reel mower; look for them used if you wanna pick one up cheap.) So is carrying your baby or groceries instead of using a stroller, car, or cart. These stressors help our bodies grow stronger and more resilient. I wonder how much of older people’s inability to live comfortably outside of a narrow temperature range, orthopedic footwear, and cushy thermo-foam-ic mattresses is related to a lifetime of coddling our bodies and removing the very stressors that keep us healthy. Movement expert Katy Bowman has many interesting things to say on this topic.
  • exposing my eyes and body to frequent, incidental sunlight by trying to spend more time outside, and aiming for every-other-day sun exposure (while avoiding sunburns!) I live in the Pacific Northwest and have pale, northern European genes, so I’m probably safe in this mostly-cloudy climate, except perhaps in summer. If you are white and live in Texas, that’s not natural, and you probably need to take more precautions when outside. If you’re black and live in northern Sweden, you might need to get more sun exposure than usual.

Speculative advice on kids

I would be especially cautious around introducing modern-unnatural things for kids, partly because brain development doesn’t even finish until we’re in our 20s. For me, that will mean convincing my wife to breastfeed our infant for as long as she can stand, no TV/phones/screens until our kids are at least a few years old (and minimizing it thereafter), no/minimal shoes, plenty of outside time, minimal sugar, lots of whole foods (chewing is good for jaw development), lots of playing, talking, reading, exercising, and socializing, and keeping them off drugs & alcohol at least until they’re into adulthood.

I haven’t really talked about the mental aspect of modern living, but there are plenty of studies linking social media use to depression, and others that show that spending time in nature makes you happier, and maybe even (at least temporarily) smarter. A short walk around my tree-filled neighborhood always leaves me feeling more relaxed & positive.

There’s nothing anti-scientific about living more naturally by default

Nothing I’m suggesting about ‘living in accordance with nature’ is unscientific or meant in any hand-wavy, spiritual way (although if living with nature is comforting to you spiritually, there’s nothing wrong with that!) I’m merely pointing out that our bias should be to assume that many aspects of the environment that human genes have developed in are likely to be important to our health. The absence of these environmental factors (sunlight), or the presence of new modern ones (cigarettes), should be viewed with extreme suspicion when we try to figure out where the diseases of modernity have come from.

If our ancestors didn’t suffer from low back pain, lung cancer, obesity, and nearsightedness like we do, and if we can see all of those diseases rising dramatically over the course of a few generations, it’s obvious that the cause is environmental, and that we should look to alter our environment (or stop altering it so much) as the easiest, cheapest, and most reliable fix. Sometimes that might come from technological ‘nature replacements/enhancements’ (vitamins & vaccines), and sometimes it might come from eschewing certain modern ‘conveniences’ (digital screens & Nike running shoes.)

Closing thoughts and caveats

Some natural things will be harmful, and many unnatural/modern ones are beneficial

‘Found in nature’ doesn’t of course mean ‘beneficial’. Plenty of things can kill you in the wild, and not all practices by prehistoric peoples will be good ones (although they are unlikely to be catastrophic to the species, otherwise those peoples would not have been our ancestors.) We know that there are negative side effects to consuming certain compounds propounded as medicine by primitive peoples (like those who call themselves “naturopaths”), and that it appears to be far safer to isolate the beneficial chemicals as pharmaceuticals in many instances.

Unnatural products can be hugely beneficial when the costs of doing nothing are large, and sometimes they simply mimic nature

Vaccines trigger our natural immunity response to build anti-bodies to fight deadly diseases, and they’ve saved millions of lives from polio, small pox, and the flu. Penicillin is probably the greatest life-saving drug in the history of the world. (Penicillin on Wax is probably the greatest 90s rap album cover in the history of the world.)

Vitamins and the fortification of foods to eliminate nutritional deficits have helped children grow up healthy and strong. Iodine in salt prevents goiters. Vitamin D helps make up for our modern lack of sunshine. Of course, those deficiencies were often the result of us removing the vitamins and nutrients in the first place by, say, replacing nutritious whole wheat and brown rice with the nutrient poor, and more fattening, white, processed versions.

Chlorine in our water prevents deadly pathogens from poisoning us, and fluoride in the trace amounts found in toothpaste protects our teeth from all the sugar & soda we’ve added to our diets. (There’s some controversy on fluoride in the water. I’m speaking here about real medical experts debating the optimal amounts and methods to get fluoride onto our teeth, not the tin-foil hat variety that considers fluoride a government plot akin to chemtrails.)

If I’m about to die young-ish, I want an ‘unnatural’ procedure

Many other modern procedures that extend life in extreme circumstances are highly desirable like heart surgeries or knee replacements. This class of costly modern interventions are probably best used when the downsides of not using them are clear and dramatic (you will die/not walk otherwise), not when the upsides are fuzzy and marginal (you agree to risky back surgery for low back pain, rather than utilize the most natural and safer option of weight loss & physical therapy.)

But modern cures often cover up modern root causes

Many of our modern inventions (contact lenses, say, or orthopedic shoes) may just be band-aids to problems of our own making that could be better solved by getting at the root cause earlier, and avoiding the need for a technical ‘fix’ later.

Some fixes might be worse than doing nothing. Blood-letting is a medieval example. Widespread prescriptions of addictive opioid painkillers is a modern one.

Live it up more naturally!

Get out there into the fresh air and sunshine and use your body like nature intended. Expose yourself to more of life’s useful stressors. Carry and breastfeed your babies if you can (but don’t sweat the breastfeeding too much if you can’t; modern formula is very good!) Change your diet to eat more whole foods and cut back on booze, tobacco, and sugar. Wear minimalist shoes, and spend some time without cushy furniture.

On happiness and choice: mindful ways to feel better about life

I watched a ‘TED Talk’ by author & psychologist Barry Schwartz on the ‘paradox of choice‘.  He explained why too much choice can make us less happy than we would be if we had fewer choices.  This is because with many choices we 1) have more regrets about our choices, 2) feel the loss of the ‘opportunity cost’ of the options we don’t choose, 3) expect more from the choice we make, and thus are more frequently disappointed, and 4) blame ourselves when we’re disappointed, since, with so much choice, we have no one to blame but ourselves if we make a bad decision.

Check out the video for more on this reasoning.  Schwartz’s arguments are a stark departure from the usual line of reasoning in American/libertarian thought which argues that more personal liberty and freedom equals more choices (and vice versa), and hence greater societal welfare.

As Schwartz argues, and as empiricalhappinessstudies have shown, this appears to be false for prosperous societies like ours.  While choice is wonderful up to a point, too much of it can be bad for us.  (Unlike poorer or dictatorial societies whose problem is not enough choice.)  Studies suggest that, despite the proliferation in material & social gains, human happiness has not increased in the United States since 1950.

I wanted to share my own thoughts (warning: this is an ‘opinion’ piece!) on this, and provide some personal recommendations on how to minimize the harmful effects of too much choice.

Simplify: less things, more experiences

Take a page out of Thoreau’s book ‘Walden’ and voluntarily cut down on choice by simplifying your life.  Reducing the things that absorb your time and energy let you focus on what really matters to you.  Consider limiting your exposure to TV and internet advertising and to shopping malls.  They increase your material options for things that probably won’t make you much happier after owning them for a couple months.

Experiences, on the other hand, increase in value over time.  Spend money & time acquiring good memories instead of a house full of things. Spending less and saving more means you can take more time off to spend time with friends and family, or to travel or engage in productive hobbies.  Or, provide more choices for those who WILL benefit from them by contributing charitably to poor nations.

The secret to happiness

Simplification notwithstanding, there are obviously many benefits to choice.  Being able to decide whom to marry, how many children to have, what job to work at, where to live, etc allow people to pick and choose the things that they believe will make them the happiest (within the range of their ability to attain these things.)  One of the problems with all of the great choices we have (think food, electronics, cars), is that people’s expectations have increased along with their improved options.  There’s much truth to Schwartz’s statement that ‘the secret to happiness is low expectations.’

To me, I think of this as a difference between absolute and relative value.  The standard economic model of human behavior is that humans care about absolute value, or how much stuff/money/time/pleasure we have on a zero to infinity scale.  Thus, if you can choose between 25 different digital music players, and can select the one with the most valuable features, you’re better off than only being able to pick from 2 players with less gadgets.

However, what humans also care about is how things match up to their expectations.  If you already expect your digital music players to do 10 things, and the new player does 11 things, you may only feel ‘1 thing’ better, but not 11 things better.  This may be easier to see in how people feel about their jobs.

Folks in the western world have more purchasing power, work less hours in more comfortable surroundings, and have more free time than any generation before us.  Despite this, many of us still hate our jobs, even though, on an absolute scale, we’re way better off than even our parents’ generation.  (Read ‘The Progress Paradox‘ if you don’t believe the last part of that sentence.)  A big reason for this is because we’ve come to expect certain characteristics in our jobs.  We measure our happiness by how much our job meets, exceeds or fails to exceed the things we take for granted.  (Like leisure time, health benefits, wages that allow us to live in large houses, own multiple cars, and never go hungry.)  If this is true, how do we learn to appreciate the ‘absolute’ value in the objectively luxurious (by historical standards) lifestyle we live?

Be appreciative at every opportunity

One way is to be actively conscious of how fortunate we are, and to remind ourselves of the good things in our lives (rather than constantly grouse about the negatives, something humans are particularly skilled at.)  For example, the next time you’re at the grocery store complaining about the unripe bananas in January, remind yourself of how amazing it is that we have access to cheap, out-of-season produce every day of the year.

Being appreciative is also important when confronted with even better versions of the stuff we already have.  Some of the happiness literature (cited above) suggests that envy is responsible for part of our failure to enjoy the immense material wealth that’s been created over the last 60 years.  When your neighbor gets a new BMW, your own Toyota Corolla doesn’t look so great in comparison.   (Never mind that your car has excellent comfort, performance and safety features, especially when compared to cars of just a few decades ago, or the fact that you were perfectly happy before your neighbor’s purchase.)

Be appreciative of people as well.  Complimenting those around you for what they do increases your happiness as well as theirs.  (Psychologists have shown this empirically; people who are more appreciative are happier than those who aren’t.)  It’s easy to take the nice things a spouse or friend does for you for granted.  Be mindful of when someone is doing something beneficial for you, and praise/reciprocate accordingly.

Be appreciative of random chance (or Providence, depending on your viewpoint) and remember all the good luck you receive, and try not to dwell on the bad.  Everyone can bring to mind the last time they were stuck in grinding traffic, but what about the last time your commute was a breeze for some inexplicable reason?  Did you remind yourself how fortunate you were at that moment?

Don’t be too hard on yourself

While I believe that people should hold themselves to high ethical and behavioral standards, I also think people beat themselves up over things that, when put in perspective, are actually quite trivial.  Even if you make a big mistake, it doesn’t make anything better to simply feel guilty about it.  Focus on the future instead: repair the damage if you can, cope with it if you can’t, and consider if you need to take preventative action going forward.

I know someone who has been agonizing about leaving a job they don’t like, mostly because they’ve invested a lot of time and effort into this career path.  They spent a lot on school to receive a specialized degree to go into this field.  They spent several years gaining experience on the job.  This person dislikes the job, but feels guilty about quitting because they’ve put so much into it.

The bottom line is, they can’t get back the time and money they spent for their current profession, so there’s no point in feeling bad about it.  Instead, they should focus on answering questions that matter like: will it make me happier to leave this career for a new one?  (Yes!)  How can I find a new career and avoid making similar mistakes in my next job?  Note that these questions deal with the controllable future, not the uncontrollable past.

Worry about what you can control, steel yourself against for the rest

This last suggestion is particularly apt to investing and my point about letting bad luck go.  In investing, the best you can do is make smart choices in the present with respect to your goals and needs.  For most people, low-fee stock index funds are the way to invest for distant goals, like retirement.  If you have $100,000 in such a fund for a retirement that’s 20 years away, and the fund drops by 25% the next day, should you feel remorse for your decision?  No!  When uncertainty is involved, rationally expected results should determine how you evaluate your decision-making, not actual results.  To see why this is true, imagine the following gambling scenario:

Multi-billionaire Bill Gates offers you the following proposition: You’ll flip a quarter, and if it comes up heads, you get $2 from Gates.  If it’s tails, you pay him $1.  Do you accept this flip?  (Make the decision in your head for the purposes of this thought experiment.)

Now ask yourself: if the coin comes down tails (you lose $1), does that mean you made a bad decision (before the flip occurred)?

Assuming your goal in this scenario is to make money, the answer to the first question is ‘yes, take the flip’ and the answer to the second question is ‘no, you made a good decision even though you lost.’  Let’s see why: 50% of the time, you win $2, the other 50% loses you $1, for a net average gain of $1 (= 2 – 1) for every two flips.  This is a positive ‘expectation’ (average result) of 50 cents per single flip.  With each flip you ‘expect’ to win 50 cents on average, so ‘yes’ you want to flip.

If the coin comes down tails, losing you a buck, did that change your expectation before the flip?  Of course not, you still had a 50 cent expectation.  Thus, even though you lost, you made the right decision in terms of maximizing your expected profit.  Similarly, your expectation for future flips is still a positive 50 cents, so you should offer to keep playing with Bill no matter how many times you lose (or win.)  (If you can flip fast enough and/or get Bill to raise the stakes, you’ll eventually bust one of the richest men in the world.)

This example can be applied to life, albeit with less clarity.  If you made a decision that seemed like a good one based on your rational evaluation of the information you could get, that’s the best you can do.  In the investing example, since market movements are impossible to predict with any accuracy (run from, or punch, anyone who tells you otherwise), there’s no point in kicking yourself if the market dives unexpectedly.  (The same goes for congratulating yourself on your wise intelligence if the market soars.)

Instead, be emotionally prepared to cope with the misfortune that is sure to come to everyone in greater or smaller amounts in life.  Counting the positive things in your life will help.  (I remind myself of my wonderful wife, friends, family, ridiculously good looks, and the existence of microbrewed beer whenever I’m feeling down.)

If your decisions repeatedly turn out badly, you should reexamine your thought process to make sure you’re really making rational decisions based on good information.  (This is because similar repeated outcomes suggest that luck is not the reason for them.)   Ask your friends or family to check your logic.  They should be quick to tell you if, say, you’ve dated obvious jerks in your last three relationships and need to stop kidding yourself about your ‘bad luck’ with love.

I’d love to hear comments from folks on how they’ve dealt with choice, and their thoughts on what I’ve written above.  Good luck implementing the above in your own life!