light

Morning sunlight exposure helps with weight loss

Tuesday, April 08, 2014 by: David Gutierrez, staff writer
Tags: sunlight exposure, weight loss, circadian rhythm

eTrust Pro Certified

Most Viewed Articles
Popular on Facebook
Malaysia Airlines Flight 370 now clearly a government cover-up: All evidence contradicts official story
White House admits staging fake vaccination operation to gather DNA from the public
10 other companies that use the same Subway yoga mat chemical in their buns
High-dose vitamin C injections shown to annihilate cancer
Irrefutable proof we are all being sprayed with poison: 571 tons of toxic lead 'chemtrailed' into America's skies every year
EXCLUSIVE: Natural News tests flu vaccine for heavy metals, finds 25,000 times higher mercury level than EPA limit for water
Truvia sweetener a powerful pesticide; scientists shocked as fruit flies die in less than a week from eating GMO-derived erythritol
Senator who attacked Doctor Oz over dietary supplements received over $146,000 in campaign contributions from Big Pharma mega-retailer and Monsanto
Global warming data FAKED by government to fit climate change fictions
U.S. treating meat with ammonia, bleach and antibiotics to kill the '24-hour sickness'
HOAX confirmed: Michelle Obama 'GMOs for children' campaign a parody of modern agricultural politics
Ben and Jerry's switches to non-GMO, Fair Trade ice cream ingredients
Battle for humanity nearly lost: global food supply deliberately engineered to end life, not nourish it
Diet soda, aspartame linked to premature deaths in women
Cannabis kicks Lyme disease to the curb
Elliot Rodger, like nearly all young killers, was taking psychiatric drugs (Xanax)
Harvard research links fluoridated water to ADHD, mental disorders
Right to farm being stripped from Americans: Michigan to criminalize small family farms with chickens, goats, honey bees and more
Delicious
(NaturalNews) Exposure to outdoor light in the morning may play a key role in achieving or maintaining a healthy weight, according to a new study conducted by researchers from Northwestern University in Chicago and published in the journal PLOS ONE on April 2.

"Light is a modifiable factor with the potential to be used in weight management programs," co-lead author Kathryn Reid said. "Just like people are trying to get more sleep to help them lose weight, perhaps manipulating light is another way to lose weight."

The researchers found that people who received most of their exposure to moderately bright or brighter light before noon had a significantly lower body mass index (a measure of weight relative to height, used to estimate obesity) than people who got most of their light exposure after noon.

"The earlier this light exposure occurred during the day, the lower individuals' body mass index," Reid said. "The later the hour of moderately bright light exposure, the higher a person's BMI."

The study was funded by grants from the National Heart, Lung and Blood Institute, the National Institute on Aging and the Office of Research on Women's Health.

Not just how much light, but when

The body's circadian rhythms -- fluctuations in hormone levels and other biological systems depending on the time of day -- are known to play an important role in metabolism and weight regulation. But this study marks the first time that scientists have shown the importance of the connection between the timing, intensity and duration of light exposure.

The researchers had 26 men and 28 women of average age 30 wear wrist actigraphy monitors to measure their light exposure and sleep patterns for seven days. Participants maintained their normal daily routines and recorded their daily dietary intake with food logs.

When the researchers looked independently for a connection between BMI and timing, intensity or duration of light exposure, they found no relationship. Then, co-lead author Giovanni Santostasi developed a measure for combining these three factors into a single number, mean light timing (MLiT). This number alone accounted for 20 percent of BMI.

"I saw that what seemed to be most associated with body mass index was not just how much light you receive but when you get it and for how long," Santostasi said.

Just 20 minutes a day

The study adds new evidence that the modern lifestyle, spent mostly indoors, can have serious health effects. Senior author Phyllis C. Zee noted that the typical U.S. work environment is lit at only 200 to 300 lux, but the minimum brightness needed to lower BMI in the study was 500 lux.

Outdoor light on a cloudy day exceeds 1,000 lux.

It is important that workplaces and schools be redesigned to incorporate more windows, and that people be encouraged to spend more time outdoors in the morning, Zee said.

"We focus on how too much light at night is bad; it's also bad not to get enough light at the appropriate time during the day," Zee said.

The researchers noted that it's not just "night owls" who are at risk of not getting exposure to sufficient bright light at the right time. Even an early riser who spends most of the morning indoors under artificial light would suffer the same negative metabolic effects.

"Light is the most potent agent to synchronize your internal body clock that regulates circadian rhythms, which in turn also regulate energy balance," Zee said. "The message is that you should get more bright light between 8 a.m. and noon."

It takes only 20 to 30 minutes of exposure to outdoor morning light to have an impact on your BMI, the study found.

Sources for this article include:

http://www.sciencedaily.com

http://www.northwestern.edu

http://science.naturalnews.com

Join over four million monthly readers. Your privacy is protected. Unsubscribe at any time.
comments powered by Disqus
Take Action: Support NaturalNews.com by linking back to this article from your website

Permalink to this article:

Embed article link: (copy HTML code below):

Reprinting this article:
Non-commercial use OK, cite NaturalNews.com with clickable link.

Follow Natural News on Facebook, Twitter, Google Plus, and Pinterest

Advertise with NaturalNews...

Support NaturalNews Sponsors:

Advertise with NaturalNews...

GET SHOW DETAILS
+ a FREE GIFT

Sign up for the FREE Natural News Email Newsletter

Receive breaking news on GMOs, vaccines, fluoride, radiation protection, natural cures, food safety alerts and interviews with the world's top experts on natural health and more.

Join over 7 million monthly readers of NaturalNews.com, the internet's No. 1 natural health news site. (Source: Alexa.com)

Your email address *

Please enter the code you see above*

No Thanks

Already have it and love it!

Natural News supports and helps fund these organizations:

* Required. Once you click submit, we will send you an email asking you to confirm your free registration. Your privacy is assured and your information is kept confidential. You may unsubscribe at anytime.