I shared a link to this article by Rowan Jacobsen, with the comment “This article falls so squarely in the sweet spot of reinforcing my own preconceptions, I almost hesitate to tweet it.” But I did, with a few brief quotes.
Freed of the limitations of twitter, here’s a more extended excerpt:
Lindqvist tracked the sunbathing habits of nearly 30,000 women in Sweden over 20 years. Originally, he was studying blood clots, which he found occurred less frequently in women who spent more time in the sun—and less frequently during the summer. Lindqvist looked at diabetes next. Sure enough, the sun worshippers had much lower rates. Melanoma? True, the sun worshippers had a higher incidence of it—but they were eight times less likely to die from it.
So Lindqvist decided to look at overall mortality rates, and the results were shocking. Over the 20 years of the study, sun avoiders were twice as likely to die as sun worshippers.
There are not many daily lifestyle choices that double your risk of dying. In a 2016 study published in the Journal of Internal Medicine, Lindqvist’s team put it in perspective: “Avoidance of sun exposure is a risk factor of a similar magnitude as smoking, in terms of life expectancy.”
Jacobsen later mentions the app dminder, which I’ve been using for several years now. It helps you optimize your sun exposure (getting maximum vitamin D production without getting sunburned, based on time of year, time of day, location, and skin pigmentation). I just checked the app, which tells me that it’s just 8 days until the vitamin D window reopens here in Savoy, Illinois!
I concluded my little tweet storm with this: Pretty much every nice day of the spring, summer, and fall, I announce to my wife around midday that “I’m going out to expose my integument to the deadly actinic rays of the sun.” And then I do. I feel so much better since I started doing this.
I have always enjoyed exercising in the heat. In this I seem to be different from most people.
I originally took note of this fondness back in the early 1980s when I was living in Ft. Lauderdale. A ritzy local tennis club—way too expensive for me—offered summer memberships for just $100. I just got access to the outdoor courts and not to the indoor amenities, but all I wanted was a place where I could reserve a court and know that it would be available when I met someone there. The only downside was that you were playing tennis outdoors, in the summer, in Ft. Lauderdale. And it turned out I was okay with that.
I’m pretty careful not to be stupid about it. (And successfully so, it seems—I’ve never gotten heat exhaustion or heat stroke.) If I start feeling tired, thirsty, or overheated, I slow down, move to the shade, and drink some cold water.
Over the years I’ve had a variety of theories about why I didn’t mind exercising in the heat when other people hate it so much. I like to imagine that I’m just better at tolerating the heat than the average person: Everyone slows down in the heat, but maybe I slow down slightly less; at some high temperature, maybe I’d become competitive! More likely, since I’m not competitive I’m not making unfavorable comparisons between my speed in the heat versus my speed in cool weather, so the fact that I slow down doesn’t make me unhappy.
Recent research has given me a new, much more likely reason why I like exercising in the heat. On Rhonda Patrick’s Found My Fitness podcast, I heard an interview with Dr. Charles Raison, in which he described the results of a study suggesting that Whole-Body Hyperthermia was an effective treatment for depression. The experiment used infrared lights to heat people up to a core body temperature of 38.5℃ (101.3℉), but Raison is convinced that there is nothing special about the device used, and that a sauna, hot spring, sweat lodge, hot yoga—or just exercising in the heat—would have the same antidepressant effect.
Dr. Raison is studying further to try to elucidate the mechanism by which hyperthermia boosts mood in depressed people. (It seems to reduce inflammation, perhaps by boosting IL-6 which activates IL-10. Heat Shock Proteins might also be involved, since they do all sorts of things.)
I have always been inclined to blame a lack of daylight for the seasonal depression that I’m prone to suffer from during the winter—both too short of a photo-period (which I address with a HappyLight™) and too little vitamin D (which I address with vitamin D supplements), but it now occurs to me that a lack of opportunity to exercise in the heat (and thereby raise my core body temperature high enough to trigger whatever it is that reduces depression) may be an independent factor.
It seems very likely that, just like my desire to spend time outdoors in daylight is probably self-medicating to boost my vitamin D and regulate my circadian rhythm, my desire to exercise in the heat is probably self-medicating to boost my mood.
I hesitate to rejoin a fitness center just to get access to a sauna, but I’ll have to investigate options for access to winter whole-body hyperthermia.
Via The Art of Manliness I found this great graphic of a nature pyramid (à la the food pyramid) at the Nature Kids Institute. It’s aimed at kids, but really the prescription for adults should be exactly the same.
It’s tougher in the winter, of course—when the grass is snow-covered and the paths are icy, they simply aren’t so runable or walkable. But that’s okay. It’s still worth getting outside.
It’s also tougher in Illinois to find wilderness than in most other places I’ve lived. There was real wilderness in Michigan and Indiana and Florida (although when I lived in Florida I did a pretty poor job of spending time in it), and of course vast amounts of real wilderness in Utah and California. Still, there are places in Champaign county where I can at least get out of sight and out of earshot of roads, even if it isn’t really free of human influence.
Anyway, these quantities seem like good initial target minimums for time in nature. Maybe not optimal, but adequate, and probably a lot better than most people manage.
Thanks to yesterday’s preternaturally warm weather I was able to expose enough skin to the deadly ultraviolet ray of the sun as to make a non-trivial quantity of vitamin D. (Plus, get in a very nice walk at the River Bend Forest Preserve.)
Some time in October every year I quit being able to get enough sun to make my own vitamin D. Eventually it gets too chilly to go out with enough skin exposed, and even if it stays warm late into the fall, eventually the implacable reality of the earth’s axial tilt means there simply aren’t enough minutes of the day when the appropriate frequencies of UV light shine down where I live.
As a practical matter, this period runs about six months. By early March there’s probably enough UV available, but it’s usually early April before the stars align such that we can take full advantage. We need days when it gets warm fairly early, because the UV is only available for a few hours right around solar noon. (Warmth at 3:00 PM is great, but doesn’t help with the UV until later in the year when the sun is even higher.) We need to get at least two or three of those days each week. (Just two days would probably be enough, if one never had schedule conflicts that kept one out of the sun around solar noon.)
My experience has been this all works out to mean that I need to rely on supplements for my vitamin D needs for right around 180 days per year. With that in mind, I’ve taken to buying two 90-pill bottles of vitamin D each fall.
When I notice—as I say, usually sometime in October—that it has been several days since I managed to get enough sun, I start taking the pills.
Just a few days ago, I finished my first bottle and opened my second.
That means I’ve made it halfway through! Another 85 or 87 days and I’ll be done with the pills and able to make my own vitamin D!
The last few years I was taking 1000 IU pills. This year I upped it to 2000 IU each day. (Not quite as big a change it sounds—I used to eat a lot of children’s breakfast cereals, often supplemented with vitamin D, but since I went low-carb I’m eating a lot less of those.)
It’s still a somewhat higher dose, which I think may be helping. So far this year I’ve only had a couple of days when I found myself glum for no good reason, a bit better than average, I think.
Steven always warns me against imagining that spring starts before April. But soon—less than 90 days now—I’ll once again be able to make my own vitamin D.
I do a lot of things to stave off winter depression. I walk. I spend time in nature. I spend time walking in nature. I move in other ways—taiji, lifting, stretching, running, parkour. I use my HappyLight™. I take vitamin D. But probably most important is finding things to take delight in.
Jackie doesn’t suffer with the dark days of winter the way I do, which is probably a matter of brain chemistry, but perhaps another factor is that she is very good at taking delight in winter as an opportunity to wear her woollies.
I’m trying to do the same.
It helps that I have new winter clothes, and old winter clothes that fit again. The photo on this page shows me walking in nature, wearing a purple sweater my mom knit for me years ago.
Besides my old sweaters and my new sweaters, I have a smashing wool vest that Jackie gave me, some wool pants that I bought as field pants (but that are perhaps too nice to wear in the field), and a vast collection of scarves that Jackie wove and knit for me. And that’s just the woollies. I also have a nice collection of moleskin and flannel garments perfect for winter, various fleecy things, and a range of jackets and coats to cover all possible temperatures from “slightly brisk” to “well north of the arctic circle.”
This year, I’ll try to take delight in my seasonally appropriate garments, especially the woollies, and see if that won’t carry me through to spring.
I’m back to work on my novel, and my brother gets some of the credit, for pointing out something that I had not considered.
Last summer, I was feeling especially good. I was feeling fit, both mentally and physically, and enjoying life. I noticed that, the more time I spent outdoors, the better I felt. I had a lot of guesses about what might have been going on. Maybe I was feeling better because I was getting:
Extra movement (I was mostly outdoors either to walk or to run)
Extra together time with Jackie (we did many long walks together)
Extra light (full sun at noon on a clear day is over 100,000 lux)
Extra vitamin D (a pale guy like me can make 10,000 IU in just 20 or 40 minutes)
The placebo effect (just doing something can often make you feel better)
I was inclined to credit the extra vitamin D (which probably helps mood). I have gone so far as to get my doctor to order a vitamin D test along with the other blood tests for my annual physical. (We’ll see how my vitamin D levels held up over the long dark winter. If the results are interesting, I’ll post them.)
I was describing all this to my brother, who said, “I think you were feeling great during high summer because you had made plans and you were executing on them. You made a plan to walk the rail trail and did that, and then made a plan to go to France (for the Esperanto conference) and did that too.”
That sounded very reasonable.
Steven, of course, had his own idea about what I might next plan and then execute (“I think you should make a plan to write an essay for the Belartaj Konkursoj”), but I knew that the most important thing to work on is my novel.
So, I’m back to work on it. Starting with a plan.
In its broadest outline, my plan is simple.
I had stalled out because I’d realized that I’d gotten the end of my novel wrong. So, I’ll fix that.
I’ll spend a couple of hours brainstorming the ideal ending of a novel along the lines of the one I’ve written, and then I’ll write the ending to that novel.
Then I can back up and rewrite the beginning so that it leads the ending I’ve come up with.
I’ve known this would be what I’d have to do for a long time. It seemed daunting six months ago, because I’d just rewritten the first part, and the idea of doing it again seemed excruciating. But now, I think I can face it.
I’m more than a little excited about writing the ending from scratch. I’ve got lots of stuff to work with—heroes I like, menacing characters for them to deal with, danger, complexity.
And, if I don’t remember all the details about exactly who was menacing in which way or why, that’s entirely okay. I’ll figure out just what sort of menacing most suites the ending I come up with. Then I can go back and diddle around with the menacing in the middle and at the beginning to make it match.
It’s got all the excitement of starting work on a new novel, with just a quarter of the work!
Way back in 2003, some clever people got the idea to go through The Fellowship of the Ring (and a handy Atlas of Middle Earth) and note down all the legs of Frodo’s journey from Hobbiton to Rivendell. Then, as they did their own daily walking, they tracked their progress, noting each milestone as they passed it. (Five miles along; crossed the Great Road from the Brandywine Bridge and entered Tookland.)
Jackie doesn’t seem to have the same strange urge I do to organize walks around some arbitrary or fantasy goal, but she has embraced the idea with some enthusiasm, and decided that we should begin at the beginning and follow the path of Bilbo’s journey to Rivendell. It begins with a hurried dash from Bag End to The Green Dragon in Bywater, then down the Great East Road to a camp site a couple of miles past the three farthing stone, for a total of 11 miles.
We won’t match Bilbo’s journey day by day, but we thought we’d at least start with an 11-mile walk to get into the spirit of the thing.
So yesterday we did.
To make the mileage come out right (and to avoid a boring bit of the walk that we do all the time), we took the bus to campus and started our walk there.
From the Research Park (just across the street from my old office) we walked through campus and on to the Urbana Library (where we returned a library book and checked out another), then went across the street to Lincoln Square Village where we had lunch in their little food court. We went back to the library where we split a brownie for desert and lingered over coffee. Then we headed west across the north end of campus, paused briefly in the Engineering Quad so I could play just a bit of Ingress, and proceeded to the water amenities at 2nd street.
We’d had lunch early, so it was at just about this point that the vitamin D window opened. It was preternaturally warm and sunny, so I took off my jacket and put it in my pack and we spent a half hour or so comprehensively walking the paths through both halves of the water amenities (with my arms exposed to the deadly ultraviolet light of the sun) before heading on to downtown Champaign. We walked through West Side Park, near our 2014 summer place, and then turned south and walked past our 2014–2015 winter palace.
Not far south of there, we passed a house where the grassy verge between the sidewalk and the road was filled with these tiny ceramic houses:
Not exactly Rivendell’s last homely house, but I felt they were adequately in the spirit of elven houses anyway.
From there we proceeded to Hessel Park, and thence along familiar paths to home.
I neglected to run Endomondo, but Google Fit claims I walked 11.1 miles.
It was a great walk! Jackie had a sore shoulder and didn’t want to carry a pack, so I carried not only the library book, but also the first aid kit, our lunches, and water for two.
Speaking of water, last year Jackie bought one of these Camelbak water bottles, and was very pleased with it. I was happy enough using bicycle-style water bottles. But—by sheerest happenstance—the kindly admins at Wise Bread gave me (as a thank-you gift for being one of their writers) the exact same water bottle as Jackie’s—except that mine has the Wise Bread logo.
These bottles are a little bigger than the ones I carried last year. That together with the library book made my pack a little heavier—enough to be noticeable, but not too much for a walk to Rivendell.
I wore my minimalist boots, which seemed like a nice compromise between my regular hiking boots and going barefoot like a hobbit. In the summer I plan to get back to barefoot walking in a big way (although it may be a while before I’m taking my long walks barefoot).