Wednesday, January 19 2011    14 Shevat,5771

 

 

News

   
 
Sleeping child
Sleeping child
Israel news photo: Alessandro Zangrilli / Wik 
 
 
Check It Out
More


Published: 01/19/11, 12:37 PM / Last Update: 01/19/11, 1:11 PM

Researchers Confirm: 'Light at Night' Linked to Cancer

 
by Chana Ya'ar
Follow Israel news on Twitter and Facebook.

 
Researchers have confirmed a link between "light at night" pollution and elevated rates of breast cancer and prostate cancer.

The news comes in the wake of a report published from a 10-year study conducted by the University of Haifa's Biology Department that found that higher-intensity light during sleep can be dangerous. The study, which found a connection between cancer and artificial lighting, adds its voice to those of previous studies that resulted in similar findings.

More than 1,670 Israeli women were involved in the study, which found that those routinely exposed to higher intensity light in their sleeping environment had 22 percent higher odds of developing breast cancer than those who slept in total darkness.

“Bulbs with high-intensity light contribute more to environmental light pollution, and lead to cancer, we found,” said researcher Professor Avraham Haim.

The researchers theorized that LAN (light at night) harms production of melatonin, a hormone that is released from the pineal gland during the dark part of the 24th cycle and which is linked to the body's night-day cycle of activity and seasonality. Melatonin modulates endogenous estrogen levels.

When the hormone is suppressed, the occurrence of cancer rises, according to the researchers, who published their report in the February issue of Chronobiology International.

Prior Evidence of Link to Cancer
Earlier studies in which Haim participated have shown that people living in areas with more night-time lighting are more susceptible to prostate cancer in men and breast cancer in women. A previous, related study published in September by Prof. Haim also demonstrated a link between suppression of melatonin and elevated rates of the disease.

Cancerous growths in mice exposed to “short days” were smallest, and mice exposed to the interval of LAN during dark hours had larger growths. Those exposed to “long days” had the largest growths.

The study also found that suppression of melatonin definitely influenced development of tumors: mice exposed to “long days” but treated with the hormone exhibited tumors the size of those exposed to “short days.” The death rate in mice treated with melatonin was significantly lower than in those not treated, researchers said.

“Exposure to LAN disrupts our biological clock and affects the cyclical rhythm that has developed over hundreds of millions of evolutionary years that were devoid of LAN,” said the researchers. “Light pollution as an environmental problem is gaining awareness around the world.”

The World Health Organization's International Agency for Research on Cancer (IARC) has already classified working the night shift as a higher grade of cancer risk, the researchers added. 


(IsraelNationalNews.com)

 
Send to Friend Comment Print Share
 

 


 
Live eBay Auctions brought to you by Arutz 7

Israel Related
Click www.4Torah.com
The biggest and most trusted Torah search engine. Powered by Google, filtered by frum editors.
Trees for Yesha
Help build the land of Israel! Plant a fruit tree today.
Learn Hebrew Online
From the convenience of your own home with Israels Best teachers
Temple Store
Buy now before the Temple is rebuilt and prices go up!
Israel Charities
Chai Lifeline
Be part of a sick child hope for a miracle
IsraLotto
Millions in prizes. The FUN way to show that you care...
Pray at the Western Wall
Pray forty consecutive days at the Western Wall endowed with everlasting sanctity!
Teach a Man to Fish
Lemaan Achai - Tzedaka with a Goal. We give a Hand, not a Handout. Together we can make a Difference.
Higher Education
Find your Yeshiva's website
Top 20 websites of Yeshivas on the Jewish Universe
Lidrosh.com
Free MP3 Torah Audio
Learn Coaching
Learn Coaching from home by distance learning
Specials
Judaica Mall
For all your Jewish needs...Quality materials built to last through the generations
Holy City Prayer Society
Prayers said for you in Jerusalem for pennies a day
Sefer Torah Net
Kosher - Guaranteed Highest Quality Sifrei Torahs, Tefillin, Mezuzot
Hebrew Art
Hebrew Illuminations Wall Calendar and Greeting Cards