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February 14, 2011
In Today's Issue
- 1 Quick Technique To Burn More Fat
- Do Warm Winter Homes Contribute To Obesity..?
- Weight Loss Expert Loses 70lbs of Ugly Fat...
1 Quick Technique To Burn More Fat
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Do Warm Winter Homes Contribute To Obesity..?
Dear Reader,
A new British study appearing in the journal Obesity Reviews, finds that higher temperatures indoors during the winter might be contributing to the rising rates of obesity in the United States and other developed countries.
Over the past few decades indoor temperatures in the U.S, and U.K. have gone up, meaning all of us are spending more time in warmer temperatures... certainly more so than any generation before us.
While research into the environmental causes of obesity has focused a lot on diet and exercise, there might well be other environmental factors, including the temperature indoors during the winter months that have an impact.
Obesity, an epidemic in the United States (one in three of us is obese) is a chronic condition that's defined by your doctor as an excess amount of body fat. While some fat is needed for storing energy, insulating the body and such, too much causes trouble.
The normal amount of body fat for women is 25-30%, while for men it's 18-23%. Anyone over these limits is considered obese. The BMI is the tool most commonly, and reliably, used to get an idea of how much body fat you have.
The researchers believe that because we spend so much time inside we restrict the range of temperatures generations before ours have experienced in daily life. This has two impacts in terms of staying at a healthy weight.
1) We don't need to expend as much energy to stay warm, and
2) We reduce the body's natural capacity to produce heat.
This reduced time spent under mild thermal stress may well impact overall energy balance according to study lead Fiona Johnson a researcher out of University College London.
In the U.K. average living room temperatures rose from 18.3ºC (64.94ºF) in 1978 to 19.1ºC (66.38ºF) in 2008, and bedroom temps also went up, from 59.36ºF to 65.3ºF. In the U.S. the temps of living rooms remained at a toasty 70.34ºF between 1987 and 2005, while the average bedroom temperature went from 66.74ºF to 68.36ºF.
Continues below...
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Do Warm Winter Homes Contribute To Obesity..? Continued...
Metabolic rate in humans is at it's lowest at 77ºF to 80.6ºF.
One area of particular interest to the research team was the role of so called
brown fat in heat production. Brown fat is different from the white kind in that
it can burn energy to create heat, and exposure to cold is believed to trigger
its production in the body.
More time spent in warmer, milder conditions may bring a loss of brown fat, thus
the reduced capacity to burn energy. In one experiment, Johnson and colleagues
found that by cutting the ambient temperature from 71.6ºF to 60.8ºF they were
able to detect brown adipose tissue in almost all the healthy volunteers.
Food consumption can also be influenced by thermal conditions - appetite decreases
in warmth. But while the models might suggest that intake is suppressed at higher
temperatures, this wouldn't compensate for the reduced energy expenditure of
the warm environment. Add some great smelling, delicious looking snacks and it's
all over.
So should we all be turning down the thermostat this winter in order to fight
obesity? It certainly couldn't hurt, and might be beneficial in reducing potentially
dangerous carbon emissions as well.
To your good health,
Kirsten Whittaker
Daily Health Bulletin Editor
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Sources:
http://www.medicinenet.com/script/main/art.asp?articlekey=125087
Medpage today more detailed article on study: http://www.medpagetoday.com/PrimaryCare/Obesity/24529
MedicineNet info on obesity in U.S.: http://www.medicinenet.com/obesity_weight_loss/article.htm
University College London, news release, January 24, 2011: http://www.ucl.ac.uk/news/news-articles/1101/11012201
Study abstract first published online, 01/24/11 in Obesity Reviews: http://onlinelibrary.wiley.com/doi/10.1111/j.1467-789X.2010.00851.x/abstract
Researcher Fiona Johnson: http://www.ucl.ac.uk/psychlangsci/staff/Research
U.S. National Institute of Diabetes & Digestive & Kidney Diseases info on weight loss: http://win.niddk.nih.gov/publications/for_life.htm
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