Bike Forums - View Single Post - Two things--either of them "Not Bad"

02-10-13 | 11:16 AM

#33

stapfam

Time for a change.

Joined: Jan 2004

Posts: 19,913

Likes: 7

From: 6 miles inland from the coast of Sussex, in the South East of England

Bikes: Dale MT2000. Bianchi FS920 Kona Explosif. Giant TCR C. Boreas Ignis. Pinarello Fp Uno.

Quote:

Originally Posted by TromboneAl

In the winter, it's impossible to produce vitamin D from the sun if you live north of Atlanta because the sun never gets high enough in the sky for its ultraviolet B rays to penetrate the atmosphere. But summer is a great time to stock up on the nutrient. When the sun's UV-B rays hit the skin, a reaction takes place that enables skin cells to manufacture vitamin D. If you're fair skinned, experts say going outside for 10 minutes in the midday sun—in shorts and a tank top with no sunscreen—will give you enough radiation to produce about 10,000 international units of the vitamin.

Here's a neat calculator that tells you how much sun exposure you need at different latitudes, dates, etc:

http://nadir.nilu.no/~olaeng/fastrt/..._quartMED.html

Thanks for that link--Put in todays date- overcast as it is persisting down and the garden is flooded again and here are the results.

Recommended UV exposure of face, hands and arms at least every other day to obtain sufficient vitamin D, equivalent of 25 micrograms vitamin D, if no dietary vitamin D is available:
Processing ... (this may take a minute)Done
Output:
minimum recommended exposure time (hours:minutes)
24: 0

Think I'll keep taking the pills

__________________
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