Wednesday, December 10, 2008

Cells in lung tissue activate vitamin D and increase immune function


New research shows that vitamin D present in the lungs stimulates the killing of bacteria and improves the body's ability to reduce inflammation.



A recent issue of the Journal of Immunology reports that vitamin D, which is primarily activated by the kidneys, is also converted to its active form in lung tissue. This conversion is essential for the beneficial activity of the vitamin in the body.

Researchers studying human lung tissue samples found that an enzyme called 1 alpha-hydroxylase helps convert vitamin D stored in the cells of the lungs into the active form of the vitamin.

The team also found that activated vitamin D increased the activity of a compound that destroys bacteria, as well as producing a protein that assists cells in their ability to fight infections.

The researchers noted that controlling inflammation through vitamin D is important because too much inflammation can cause problems related to sepsis (blood poisoning) and contribute to certain autoimmune diseases.

The Journal of Immunology, 2008, 181: 7090-7099.

Monday, December 8, 2008

10 Things the Food Industry Doesn't Want You to Know

Two nutrition experts argue that you can't take marketing campaigns at face value.
By Adam Voiland, U.S. News & World Report


With America's obesity problem among kids reaching crisis proportions, even junk food makers have started to claim they want to steer children toward more healthful choices. In a study released earlier this year, the Centers for Disease Control and Prevention reported that about 32 percent of children were overweight but not obese, 16 percent were obese, and 11 percent were extremely obese.

Food giant PepsiCo, for example, points out on its Web site that "we can play an important role in helping kids lead healthier lives by offering healthy product choices in schools." The company highlights what it considers its healthier products within various food categories through a "Smart Spot" marketing campaign that features green symbols on packaging. PepsiCo's inclusive criteria—explained here—award spots to foods of dubious nutritional value such as Diet Pepsi, Cap'n Crunch cereal, reduced-fat Doritos, and Cheetos, as well as to more nutritious products such as Quaker Oatmeal and Tropicana Orange Juice.

But are wellness initiatives like Smart Spot just marketing ploys? Such moves by the food industry may seem to be a step in the right direction, but ultimately makers of popular junk foods have an obligation to stockholders to encourage kids to eat more—not less—of the foods that fuel their profits, says David Ludwig, a pediatrician and the co-author of a commentary published in a recent Journal of the American Medical Association that raises questions about whether big food companies can be trusted to help combat obesity. Ludwig and article co-author Marion Nestle, a professor of nutrition at New York University, both of whom have long histories of tracking the food industry, spoke with U.S. News and highlighted 10 things that junk food makers don't want you to know about their products and how they promote them.

1. Junk food makers spend billions advertising unhealthy foods to kids.

According to the Federal Trade Commission, food makers spend some $1.6 billion annually to reach children through the traditional media as well the Internet, in-store advertising, and sweepstakes. An article published in 2006 in the Journal of Public Health Policy puts the number as high as $10 billion annually. Promotions often use cartoon characters or free giveaways to entice kids into the junk food fold. PepsiCo has pledged that it will advertise only "Smart Spot" products to children under 12.

2. The studies that food producers support tend to minimize health concerns associated with their products.

In fact, according to a review led by Ludwig of hundreds of studies that looked at the health effects of milk, juice, and soda, the likelihood of conclusions favorable to the industry was several times higher among industry-sponsored research than studies that received no industry funding. "If a study is funded by the industry, it may be closer to advertising than science," he says.

3. Junk food makers donate large sums of money to professional nutrition associations.

The American Dietetic Association, for example, accepts money from companies such as Coca-Cola, which get access to decision makers in the food and nutrition marketplace via ADA events and programs, as this release explains. As Nestle notes in her blog and discusses at length in her book Food Politics (University of California Press, 2007), the group even distributes nutritional fact sheets that are directly sponsored by specific industry groups. This one, for example, which is sponsored by an industry group that promotes lamb, rather unsurprisingly touts the nutritional benefits of lamb.

The ADA's reasoning: "These collaborations take place with the understanding that ADA does not support any program or message that does not correspond with ADA's science-based healthful-eating messages and positions," according to the group's president, dietitian Martin Yadrick. "In fact, we think it's important for us to be at the same table with food companies because of the positive influence that we can have on them."

4. More processing means more profits, but typically makes the food less healthy.

Minimally processed foods such as fresh fruits and vegetables obviously aren't where food companies look for profits. The big bucks stem from turning government-subsidized commodity crops—mainly corn, wheat, and soybeans—into fast foods, snack foods, and beverages. High-profit products derived from these commodity crops are generally high in calories and low in nutritional value.

5. Less-processed foods are generally more satiating than their highly processed counterparts.

Fresh apples have an abundance of fiber and nutrients that are lost when they are processed into applesauce. And the added sugar or other sweeteners increase the number of calories without necessarily making the applesauce any more filling. Apple juice, which is even more processed, has had almost all of the fiber and nutrients stripped out. This same stripping out of nutrients, says Ludwig, happens with highly refined white bread compared with stone-ground whole wheat bread.

6. Many supposedly healthy replacement foods are hardly healthier than the foods they replace.

In 2006, for example, major beverage makers agreed to remove sugary sodas from school vending machines. But the industry mounted an intense lobbying effort that persuaded lawmakers to allow sports drinks and vitamin waters that—despite their slightly healthier reputations—still can be packed with sugar and calories.

7. A health claim on the label doesn't necessarily make a food healthy.

Health claims such as "zero trans fats" or "contains whole wheat" may create the false impression that a product is healthy when it's not. While the claims may be true, a product is not going to benefit your kid's health if it's also loaded with salt and sugar or saturated fat, say, and lacks fiber or other nutrients. "These claims are calorie distracters," adds Nestle. "They make people forget about the calories."

Dave DeCecco, a spokesperson for PepsiCo, counters that the intent of a labeling program such as Smart Spot is simply to help consumers pick a healthier choice within a category. "We're not trying to tell people that a bag of Doritos is healthier than asparagus. But, if you're buying chips, and you're busy, and you don't have a lot of time to read every part of the label, it's an easy way to make a smarter choice," he says.

8. Food industry pressure has made nutritional guidelines confusing.

As Nestle explained in Food Politics, the food industry has a history of preferring scientific jargon to straight talk. As far back as 1977, public health officials attempted to include the advice "reduce consumption of meat" in an important report called "Dietary Goals for the United States." The report's authors capitulated to intense pushback from the cattle industry and used this less-direct and more ambiguous advice: "Choose meats, poultry, and fish which will reduce saturated fat intake." Overall, says Nestle, the government has a hard time suggesting that people eat less of anything.

9. The food industry funds front groups that fight anti-obesity public health initiatives.

Unless you follow politics closely, you wouldn't necessarily realize that a group with a name like the Center for Consumer Freedom has anything to do with the food industry. In fact, Ludwig and Nestle point out, this group lobbies aggressively against obesity-related public health campaigns—such as the one directed at removing junk food from schools—and is funded, according to the Center for Media and Democracy, primarily through donations from big food companies such as Coca-Cola, Cargill, Tyson Foods, and Wendy's.

10. The food industry works aggressively to discredit its critics.

According to the new JAMA article, the Center for Consumer Freedom boasts that "[our strategy] is to shoot the messenger. We've got to attack [activists'] credibility as spokespersons." Here's the group's entry on Marion Nestle.

The bottom line, says Nestle, is quite simple: Kids need to eat less, include more fruits and vegetables in their diet, and limit the junk food.

Courtesy of U.S. News & World Report

Significant Weight Loss Boosts Sex Life






Obese individuals who slim down enjoy enhanced love lives, a new study finds.

For obese men and women who report sexual problems, weight loss of approximately 10% may do wonders for their love lives, according to Duke University psychologist Martin Binks. Dr. Binks, who presented his research findings at the recent annual meeting of The Obesity Society in Vancouver, British Columbia, reported that weight loss improves the sex lives of some obese individuals by reducing their negative feelings about their sexuality and helping them feel better about their bodies.
The Effects of One Year of Weight Loss

In the study, Dr. Binks and his colleagues met with 161 obese women and 26 obese men every three months for two years to ask a series of questions about the quality of their sex lives. Each participant answered questions about feelings of sexual attractiveness, frequency of sexual desire, reluctance to be seen undressed, sexual performance, avoidance of sexual encounters, and enjoyment during sex. All participants were actively involved in a weight loss program during the course of the study.

In the initial interviews, men and women both described significant problems in all examined areas of their sex lives. Interestingly, however, both men and women reported striking improvements in these problems one year later, after losing an average of 12% of their initial weight (for example, if a 250 lb. man lost 30 lbs).

At the beginning of the study, more than two-thirds of all women felt sexually unattractive and did not want to be seen undressed, but after one year of weight loss, only one-third of the women expressed these feelings. In addition, although 21% of women reported not enjoying sex at the beginning of the study, only 11% said so one year later, after their significant weight loss.

Overall, improvements in participants’ sexual quality of life were directly related to weight loss, and reached their peak at a weight loss of about 12%, with only small incremental improvements noted thereafter. Though the small number of men in the study limits conclusions that can be drawn about the effect of weight loss on sexual attitudes and sexual problems among men, many of the men in the study did report feelings of unattractiveness and unwillingness to be seen undressed that improved dramatically with significant weight loss.
How Weight Loss Helps

Many physical factors are likely at play in the impressive improvements in libido and other aspects of sexual quality of life reported with weight loss among the men and women in this study. Medical problems such as poor circulation, high cholesterol levels, and insulin resistance (a strong risk factor for type 2 Diabetes) are associated with sexual performance problems that can undermine desire among both men and women. These medical problems improve when people lose weight, and sexual performance and self-image reap the benefits. Also, obese men and women make more of a natural body chemical called SHBG (sex hormone binding globulin) that binds to and inactivates testosterone, an essential part of the body chemistry of arousal for both men and women. So, when SBGH levels rise in obesity, less testosterone circulates in the bloodstream, and libido hits a lull.

The research findings described by Dr. Binks and his colleagues add to a growing body of information about the relationship between body weight and sexual health. Related studies have reported diminishments in self-esteem and other aspects of life quality among obese men and women.

A Ripple Effect
It is widely known that the significant weight loss represented by a 10% reduction in body weight can very dramatically improve many health problems associated with obesity. However, in addition to feeling better about sex, those who lose significant weight may feel better about many other things as well. The reason? Increased sexual activity is an overall mood enhancer because it releases endorphins, some of the body’s natural “feel good” chemicals. So, for many people, less weight equals more and better sex, which equals more endorphins—all good reasons why people working to lose weight may want to opt for their mate instead of their plate.

RESOURCES:

Mann. D. Bedroom Olympics May Be Key To Fitness And Weight Loss. WebMD. Available online at www.webmd.com/content/article/100/105757. accessed December 11, 2005.

NAASO,The Obesity Society. The practical guide: identification, evaluation, and treatment of overweight and obesity in adults. Available online at www.naaso.org/information. Accessed December 3, 2005

TechnoGym /The Wellness Company. Obesity and Sexuality. Available online at www.technogym.com//corporate/_vti_g2_wnarticle.asp?rpstry=11200_&rfrsh=545905&idnews=226. Accessed Decmber 2, 2005.
REFERENCES:

Binks M, Adolfsson B. Duke study reports sex, self esteem diminish for morbidly obese. CDS Rev. 2005 Jul-Aug;98(4):28-9.
Kinzl JF, Trefalt E, Fiala M, et al. Partnership, sexuality, and sexual disorders in morbidly obese women: consequences of weight loss after gastric banding. Obes Surg. 2001 Aug;11(4):455-8.

Trischitta V. Relationship between obesity-related metabolic abnormalities and sexual function. J Endocrinol Invest. 2003;26(3 Suppl):62-4.

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTH CARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health care provider prior to starting any new treatment or with any questions you may have regarding a medical condition.

Edits to original content made by Balanced Vitality.

Copyright © 2007 EBSCO Publishing All rights reserved.