Recently in Chemical Research Category

I've followed the honey bee crisis known as "colony collapse disorder" because of their close connection with our food supply, with nature, and because bees are one of the few "domesticated" insects in our economy.

Science is finally making headway on what is causing the die off of complete hives of bees.

Penn State researchers worked with the National Science Laboratory of the U.S. Department of Agricultural Marketing Service that already tests commodities such as milk and fruits and vegetables.

Honey has not regularly been analyzed, and bee pollen was not a commodity and so was not analyzed at all. The researchers decided to use types of screening the lab uses for milk and apples, which looks at over 170 pesticides. What they found is quite astounding to me... because of what it says about our agricultural practices.

All of the bees tested showed at least 1 pesticide and pollen averaged 6 pesticides with as many as 31 in a sample.

Honeycomb may contain pesticides applied years ago.

Scientists do not know that these chemicals have anything to do with colony collapse disorder, but scientists have concluded that these pesticides are definitely stressors. Penn State's Dr. Maryann Frazier say, "Pesticides alone have not shown they are the cause of CCD. We believe that it is a combination of a variety of factors, possibly including mites, viruses and pesticides."

While beekeepers will have a difficult time controlling pesticide exposure outside the hive, the Penn State researchers tested a method using gamma radiation for reducing the chemical load in beeswax and they found that irradiation broke down about 50% of the acaricides, pesticides that kill mites.

Read all the details at the Environment News Service.

It is helpful to know which conventional foods are most likely to be grown with pesticides, and which foods  have natural barriers such as a thick skin that can protect the edible food from some of that pesticide residue.  High risk foods are best bargains for buying "organic" even if the cost is greater. 

Remember, health costs are not just about food cost, but also about health care costs and lost productivity from illness and loss of energy.

Conventional Fruits and Vegetables with the Highest Pesticide Dietary Risk Index Scores:

Imported


Fruits
Grapes: 282
Nectarines: 281
Peaches: 266
Pears: 221
Strawberries: 78

Vegetables:
Sweet bell peppers: 720
Lettuce: 326
Cucumbers: 317
Celery: 170
Tomatoes: 142

Complete Dietary Risk Index can be found in the full report, downloadable at The Organic Center

About The Organic Center
The Organic Center, based in Boulder, CO, is a 501(c)(3) nonprofit organization founded in 2002 to generate and advance credible, peer-reviewed scientific research and information on the health and environmental benefits of organic food and farming - and to communicate those benefits to the public through education, resources and information. By doing so, it helps promote the conversion of more farmland to organic methods, improve public health, and work to restore our natural world through more sustainable and ecological practices. All of The Organic Center's research reports and publications are available free at www.organic-center.org. Individuals can also sign up for our free monthly e-newsletter, The Scoop. For information about The Organic Center, its current programs and scientific reports please visit www.organic-center.org or call 303.499.1840.

Helping Consumers Minimize Pesticide Exposures

The Organic Center's report also presents lists of fresh fruits and vegetables that score the highest using the DRI. Two lists cover domestically grown fruits and vegetables, while two others apply to imported produce that typically enters the U.S. market in the wintertime.

The organization hopes consumers will follow these lists in determining which organic fruits and vegetables will most significantly improve their personal pesticide dietary risk equation.

Conventional Fruits and Vegetables with the Highest Pesticide Dietary Risk Index Scores:

Domestic


Fruits
Cranberries: 178
Nectarines: 97
Strawberries: 56
Peaches: 54
Pears: 48

Vegetables
Green beans: 330
Sweet bell peppers: 132
Celery: 104
Cucumbers: 93
Potatoes: 74

SOURCE: The Organic Center

Pesticide Residues are Hard to Avoid

Driving pesticide risks downward is important because, according to pediatrician Alan Greene, M.D., chairman of The Organic Center's board of directors, "Recent science has established strong links between exposure to pesticides at critical stages of prenatal development and throughout childhood, and heightened risk of pre-term, underweight babies, developmental abnormalities impacting the brain and nervous system, as well as diabetes and cancer."

"Yes, with surprising frequency, all Americans, including infants and children, are exposed to pesticides via their diet and drinking water," added Dr. Benbrook.

In fact, Dr. Benbrook noted, recent USDA pesticide residue and food consumption surveys show that most people consume three to four residues daily just through fruits and vegetables.

"Accounting for residues in conventional milk, tap water and other foods, the average American exposes him or herself to ten to 13 pesticide residues daily," Dr. Benbrook added.

The frequency of multiple pesticide residues in conventional produce contributes significantly to each person's daily dose. Multiple residues are eight-times more likely in conventional produce than in organic produce. Reasons why include:
  • A conventional spinach sample in 2006 testing was found to have nine residues, a kale sample had 10, and a raisin sample contained 11;
  • Almost half the conventional peach samples in 2006 contained five or more residues;
  • Conventional sweet bell peppers top the multiple-residue chart, with two samples containing 12 pesticides in 2003 testing; and,
  • More than one-third of conventional fruit and vegetable samples in 2006 contained multiple residues.

Converting Nation's Produce Farms to Organic, Coupled with Buying Organic Imported Produce, Would Reduce Pesticide Risks by 97%

The Organic Center bases its 97 percent risk reduction estimate upon a "Dietary Risk Index" (DRI), developed by the EPA's Office of Inspector General (OIG). The EPA-OIG used the index in a 2006 appraisal of the impacts of the 1996 Food Quality Protection Act (FQPA) on pesticide dietary risks.

The Organic Center applied the same DRI to estimate the changes that would occur in risk levels if all produce were grown using organic methods. The Organic Center concluded that a 100 percent reduction in risk is unattainable because of the widespread use of pesticides on conventional farms, and the movement of pesticides in the air and water onto organic farm fields.

"While it will take years to convert most American fruit and vegetable farms to organic methods, the process is well underway and accelerating fast, especially in the Western U.S.," Dr. Benbrook noted. Already, organic produce accounts for nearly ten percent of retail sales of fresh fruits and vegetables. Several major fresh produce grower-shippers have recently announced aggressive timetables to convert all or most of their fruit and vegetable acreage to organic, assuming consumer demand continues to grow.

The report points out that a substantial reduction in pesticide exposure will remove, or markedly lesson, an important risk factor for several serious public health problems.

SOURCE: www.organic-center.org

Reduce Pesticide Dietary Risks by 97%

Converting the nation's eight million acres of produce farms to organic
would reduce pesticide dietary risks by about 97 percent, according to
research from The Organic Center


The Organic Center provides the first-ever quantitative estimate of the degree to which pesticide risks from food can be eliminated through adoption of organic farming methods in "Simplifying the Pesticide Risk Equation: The Organic Option," a new State of Science Review by Dr. Charles Benbrook, the Organic Center's chief scientist.

Less than three percent of the nation's cropland produces fruits and vegetables. Yet, according to The Organic Center, these crops account for most of the pesticide risks from dietary exposure in domestically produced foods. The 97 percent risk reduction can only be achieved if converting domestic cropland of organic is coupled with consumers choosing only imported produce that is certified organic.

The estimates are based on up-to-date pesticide residue data from the U.S. Department of Agriculture, and the Environmental Protection Agency's current methods for estimating pesticide dietary risks.

Founded in 2002, The Organic Center is a non-profit devoted to presenting and providing peer-reviewed scientific evidence on how organic products benefit human health and environmental quality.

Other findings and information shared in the report include:
  • An analysis of the significantly greater pesticide risks linked to consumption of imported conventionally-grown fruits and vegetables, as compared to domestically-grown produce.
  • Rankings of dietary risk levels in select conventionally-grown fruits and vegetables, arranged to help guide consumers seeking to minimize pesticide risks.
  • Suggestions on how to meet dietary guidelines for fruit and vegetable intake in the winter, while also reducing pesticide exposures.
  • An overview of pesticide residues found in milk.

The Organic Center offers a free download of its report from their website. 
Two New EHP Studies Highlight the Developmental Impacts of Pesticides

A team of scientists funded by the U.S. government studied the impact of proximity to pesticide applications and the risk of childhood cancer in a sophisticated, nation-wide study that included records on over 25 million children up to 14 years old.

The team found elevated risk for several types of childhood cancers as a function of living in areas with intensive pesticide use.  Elevated cancer risk was found for Hodgkin lymphoma, Wilms' tumor, renal carcinomas, Ewing's sarcoma, thyroid cancers, and malignant melanoma.

Moreover, there was "a remarkably consistent dose-response effect seen for counties having greater than 60% of the total county acreage devoted to farming."

Danish scientists studied male reproductive development among children born to women working during pregnancy in the greenhouse industry in Denmark.  Sons of mothers working in greenhouses in the high-pesticide exposure group had triple the risk of cryptorchidism (a malformation of male genitals), compared to boys raised in Copenhagen.  The sons of women working in greenhouses  suffered from a variety of  reproductive abnormalities and/or problems and various reproductive system hormone imbalances.

The authors point out that these adverse developmental effects occurred despite the very strict worker-safety protocols in place in the Danish greenhouse industry

Sources:
S.E. Carozza et al., "Risk of Childhood Cancers Associated with Residence in Agriculturally Intense Areas in the U.S," and

H.R. Andersen et al., "Impaired Reproductive Development in Sons of Women Occupationally Exposed to Pesticides during Pregnancy," Environmental Health Perspectives, Vol. 116, No. 4, April 2008.

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