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February 24, 2019

BehindTheMedspeak: Does sunlight through glass provide vitamin D?


From the New York Times:


Sunlight doesn't actually "provide" you with vitamin D.

Rather, your body produces vitamin D when skin is exposed to the sun's ultraviolet rays, which trigger vitamin D synthesis.

The liver and kidneys convert this biologically inert form of vitamin D into biologically active forms the body can use to promote calcium absorption and bone health.

But sunlight consists of both ultraviolet A, or UVA, which penetrates deep within the skin layers and can cause premature aging; and ultraviolet B, or UVB, which causes the redness of sunburn.

It's the UVB rays that trigger the synthesis of vitamin D.

Many people can derive the vitamin D that their bodies need through direct exposure to sunlight during the summer months.

As little as 10 minutes a day of sun exposure is typically adequate.

But for many, particularly those living in northern climes, production of vitamin D will be inadequate during the winter months.

And you can't get adequate UVB exposure sitting indoors or in a car.

Virtually all commercial and automobile glass blocks UVB rays.

As a result, you will not be able to increase your vitamin D levels by sitting in front of a sunny window, though much of the UVA radiation will penetrate the glass and may be harmful.

"It doesn't matter if it's winter or summer, you will make no vitamin D sitting in front of a window — zip," said Dr. Michael Holick, a professor of medicine, physiology and biophysics at Boston University School of Medicine.

Those concerned about low vitamin D levels can get more of the vitamin through foods.

The best dietary source for vitamin D is old-fashioned cod liver oil.

Other dietary sources include swordfish and salmon and, to a lesser extent, fortified milk, orange juice, and yogurt, as well as sardines canned in oil, egg yolks, and fortified cereals.

Dietary supplements are also available.


Extra credit: in the graphic up top, locate the bond in the cholesterol molecule whose breakage results in the synthesis of vitamin D.

February 24, 2019 at 04:01 PM | Permalink | Comments (1)

"My new favorite building in Milan" — Michael Boodro

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Added Boodro in his tweet, "And how I feel returning to a cold, gray, and rainy NYC."

[via Laren Stover]

February 24, 2019 at 02:01 PM | Permalink | Comments (0)

"I am sitting in a room" — Alvin Lucier

Audere est credere.

February 24, 2019 at 12:01 PM | Permalink | Comments (0)

Experts' Experts: How do car costs change with age?


From YourMechanic:

Maintenance costs increase as a car ages.

A stable, consistent increase of $150 per year in costs exists for years 1 through 10.

After that, there is a distinct jump between 11 and 12 years of age.

After age 13, costs plateau around $2,000 per year.

This is likely because people disown their cars if maintenance costs are higher than their cars' worth.

February 24, 2019 at 10:01 AM | Permalink | Comments (0)

Avocado Toast Trainers

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Don't. Want.

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From the Guardian, which notes they were created by "the U.S. running shoe firm Saucony, which last year released a Dunkin' Donuts range of shoes with sprinkles and hot and iced coffee hues on a pink frosted base to celebrate the Boston Marathon."

Saucony has also released "lobster-themed trainers, which were orange. Pumpkin latte-themed trainers, which were pumpkin-colored. In 2015, Saucony released a line of Irish coffee trainers that had a dark coffee color, a honey-colored whiskey layer, and a thick layer of white cream."

Saucony Originals Shadow 6000 Avocado Toast sneakers cost $130.

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They come in men's sizes and will be available beginning next Tuesday, February 26, at select retailers and Saucony.com.

February 24, 2019 at 08:01 AM | Permalink | Comments (0)

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