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Studies have found that meditation helps prevent the recurrence of depression, perhaps by producing changes in parts of the brain associated with learning and anxiety. A new study suggests that meditation may modulate brain waves called alpha rhythms, which help regulate the transmission of sensory input from the surrounding environment.

After eight weeks, the brain scans showed that alpha rhythms changed more quickly and in a more pronounced way in participants who had been meditating. “If you’re reading something in a noisy environment and you want to be in a bubble, you might use your alpha rhythms like a volume knob, to turn down the volume on neurons that represent sound from the outside world,

Studies have found that meditation helps prevent the recurrence of depression, perhaps by producing changes in parts of the brain associated with learning and anxiety. A new study suggests that meditation may modulate brain waves called alpha rhythms, which help regulate the transmission of sensory input from the surrounding environment.

Addiction, says Maté, is nothing more than an attempt to self-medicate emotional pain.

The only difference between the identified addict and the rest of us is a matter of degrees.

Maté points to a host of studies that clearly show how neural circuitry is developed in early childhood. Human babies, more than any other mammals, do most of their maturing outside the womb, which means that their environment plays a larger role in brain development than in any other species. Factor in an abusive, or  at least  stressful, childhood environment and you’ve produced impaired brain circuitry – a brain that seeks the feel-good endorphins  and stimulating dopamine that it is unable or poorly able to produce on its own. A brain that experiences the first rush of heroin as a “warm, soft hug,” as a 27-year-old sex trade worker described it to Maté.

But the local food movement now threatens to devolve into another one of those self-indulgent — and self-defeating — do-gooder dogmas. Arbitrary rules, without any real scientific basis, are repeated as gospel by “locavores,” celebrity chefs and mainstream environmental organizations. Words like “sustainability” and “food-miles” are thrown around without any clear understanding of the larger picture of energy and land use.

The statistics brandished by local-food advocates to support such doctrinaire assertions are always selective, usually misleading and often bogus. This is particularly the case with respect to the energy costs of transporting food. One popular and oft-repeated statistic is that it takes 36 (sometimes it’s 97) calories of fossil fuel energy to bring one calorie of iceberg lettuce from California to the East Coast. That’s an apples and oranges (or maybe apples and rocks) comparison to begin with, because you can’t eat petroleum or burn iceberg lettuce.

The real energy hog, it turns out, is not industrial agriculture at all, but you and me. Home preparation and storage account for 32 percent of all energy use in our food system, the largest component by far. A single 10-mile round trip by car to the grocery store or the farmers’ market will easily eat up about 14,000 calories of fossil fuel energy. Just running your refrigerator for a week consumes 9,000 calories of energy. That assumes it’s one of the latest high-efficiency models; otherwise, you can double that figure. Cooking and running dishwashers, freezers and second or third refrigerators (more than 25 percent of American households have more than one) all add major hits. Indeed, households make up for 22 percent of all the energy expenditures in the United States. Agriculture, on the other hand, accounts for just 2 percent of our nation’s energy usage; that energy is mainly devoted to running farm machinery and manufacturing fertilizer. In return for that quite modest energy investment, we have fed hundreds of millions of people, liberated tens of millions from backbreaking manual labor and spared hundreds of millions of acres for nature preserves, forests and parks that otherwise would have come under the plow.

ALL THAT is grassy is not green. There are many good reasons to like local food, but any large-scale metropolitan farming will do more harm than good to the environment. Devoting scarce metropolitan land to agriculture means lower density levels, longer drives, and carbon emission increases which easily offset the modest greenhouse gas reductions associated with shipping less food.

But while neighborhoods benefit from the occasional communal garden, it is a mistake to think that metropolitan areas could or should try to significantly satisfy their own food needs. Good environmentalism is smart environmentalism that thinks through the total systemic impacts of any change. Farm land within a metropolitan area decreases density levels and pushes us apart, and carbon emissions rise dramatically as density falls.

We must weigh the environmental benefits from shipping less food against the environmental costs of producing and storing local food in a state that doesn’t exactly have ideal conditions for every kind of produce.

WHY is nearsightedness so common in the modern world? In the early 1970s, 25 percent of Americans were nearsighted; three decades later, the rate had risen to 42 percent, and similar increases have occurred around the world.

There is significant evidence that the trait is inherited, so you might wonder why our myopic ancestors weren’t just removed from the gene pool long ago, when they blundered into a hungry lion or off a cliff. But although genes do influence our fates, they are not the only factors at play. In this case, the rapid increase in nearsightedness appears to be due to a characteristic of modern life: more and more time spent indoors under artificial lights.

Our genes were originally selected to succeed in a very different world from the one we live in today. Humans’ brains and eyes originated long ago, when we spent most of our waking hours in the sun. The process of development takes advantage of such reliable features of the environment, which then may become necessary for normal growth. Researchers suspect that bright outdoor light helps children’s developing eyes maintain the correct distance between the lens and the retina — which keeps vision in focus. Dim indoor lighting doesn’t seem to provide the same kind of feedback. As a result, when children spend too many hours inside, their eyes fail to grow correctly and the distance between the lens and retina becomes too long, causing far-away objects to look blurry.