Rick Scibelli, Jr. for The New York Times 
Mount Lemmon in the Santa Catalina Mountains.
 
TUCSON
 — Your day breaks, your mind aches  for something stimulating to match 
the stirrings of the season.  The gate at the urban edge is open,  here 
to the Santa Catalina Mountains, and yet you turn inward, to pixels and 
particle-board vistas.
Something’s amiss. A third of all American 
adults — check, it just went up to 35.7 percent — are obese. The French 
don’t even have a word for fat, Paul Rudnick mused in a mock-Parisian 
tone in
The New Yorker last week.  “If a woman is obese,” he wrote, “we 
simply call her American.”
And, of course, our national branding 
comes with a host of deadly side effects: heart disease, stroke, Type 2 
diabetes, certain kinds of cancer.  Medical costs associated with 
obesity and inactivity are nearly $150 billion a year. 
 This grim toll is well known.  Cripes: maybe surgery is the answer, or a
 menu of energy drinks and vodka (the Ann Coulter diet?).  Count the 
calories. Lay off the muffins.  Atkins one week, Slim-Fast the next. We 
spend more than $50 billion on the diet-industrial complex and have 
little to show for it (or too much).
But there is an obvious 
solution — just outside the window. For most of human history, people 
chased things or were chased themselves.  They turned dirt over and 
planted seeds and saplings.  They took in Vitamin D from the sun, and 
learned to tell a crow from a raven (ravens are larger; crows have a 
more nasal call; so say the birders).  And then, in less than a 
generation’s time, millions of people completely decoupled themselves 
from nature.
There’s a term for the consequences of this divorce 
between human and habitat — nature deficit disorder, coined by the 
writer Richard Louv in a 2005 book, 
“Last Child in the Woods.” It sounds trendy, a bit of sociological shorthand, but give the man and his point a listen.
Louv
 argued that certain behavioral problems could be caused by the sharp 
decline in how little time children now spend outdoors, a trend updated 
in the 
latest Recreation Participation Report. The number of boys ages 6 to 12 who engage in some kind of outdoor activity, in particular, continues to slide.
Kids
 who do play outside are less likely to get sick, to be stressed or 
become aggressive, and are more adaptable to life’s unpredictable turns,
 Louv said. Since his book came out, things have  gotten worse.
“The
 average young American now spends practically every minute — except for
 the time in school – using a smartphone, computer, television or  
electronic device,” my colleague Tamar Lewin 
reported in 2010, from a Kaiser Family Foundation study.
You
 can blame technology, but behind every screen-dominant upbringing is an
 overly cautious parent. Understandably, we want to protect our kids 
from  “out there” variables. But it’s better not just to play in dirt, 
but to eat it. 
Studies show exposure to the randomness of nature may actually boost the immune system.
Nature
 may eventually come to those who shun it, and not in a pretty way. We 
stay indoors. We burn fossil fuels. The CO2 buildup adds to global 
warming.  Suburbs of Denver are aflame this week, and much of the United
 States is getting ready for the tantrums of hurricane and tornado 
season, boosted by atmospheric instability.
Last week, an 
Australian mountaineer named Lincoln Hall died at the age of 56, and in 
the drama of that life cut short is a parable of sorts. Hall is best 
known for surviving a night at more than 28,000 feet on Mount Everest,  
in 2006. He’d become disoriented near the summit, and couldn’t move — to
 the peril of his sherpas. They left him for dead. And Hall’s death was 
announced to his family.
But the next day, a group of climbers 
found Hall sitting up, jacket unzipped, mumbling, badly frostbitten — 
but alive.  He later wrote a book, “Dead Lucky: Life After Death on 
Mount Everest.”
Still, having survived perhaps the most inhospitable, dangerous and life-killing perch on the planet, 
Hall died in middle age of a human-caused malady from urban life  — mesothelioma, attributed to childhood exposure to asbestos.
Various
 groups, from the outdoor co-op  REI to the Trust for Public Land, have 
have been working to
ensure that kids have more contact with the alpine 
world than one lined with asbestos.  And they don’t even have to haul 
children off to a distant mountain to get some benefit.  An urban park 
would do.
This week, Michelle Obama appeared in the glow of 
spring’s optimism to kick off the fourth year of the White House Kitchen
 Garden, a component of her campaign to curb childhood obesity.  If she 
is successful, it will be because people learned by their own initiative
 — perhaps at her prompting.  A worm at work can be a wonderful 
discovery if you’ve never seen one outside of a flat-screen. But so are 
endorphins, the narcotic byproduct of exercise.
“Hope is the thing
 with feathers,” wrote Emily Dickinson. The First Lady supplied her own 
variation on the theme, with two powerful words that can go a long way 
to battling nature deficit disorder: “Let’s plant!”