Posts Tagged: walnuts
New findings on benefits of “biofactors” in food
Can what we eat help fix what ails us? Research increasingly suggests the answer is “yes.” Many foods contain biofactors — biologically active compounds — that may prevent and treat illnesses including asthma, diabetes and heart disease, according to new studies from the UC Davis Center for Health and Nutrition Research (CHNR).
The upcoming July-September California Agriculture journal (to be posted by July 11) reports UC research into plant compounds (phytochemicals) that can help prevent or treat disease. The findings stem from pilot projects at the center, as well as other UC research. Articles focus on how micronutrients, biofactors and phytochemicals (plant compounds) can help reduce the risk of chronic diseases.
Phytochemicals and health. Epidemiological studies link particular diets to less risk of chronic diseases. Notably, the traditional Mediterranean diet — mostly vegetables, fruits and whole grains, with moderate amounts of nuts, olive oil and red wine — is associated with lower rates of heart disease, cancer, and Parkinson's and Alzheimer's diseases. However, it has yet to be firmly established that specific phytochemicals in our diets can protect against diseases. Nutritionists therefore advise eating a wide variety of plant-based foods rather than taking supplements.
Mitochondrial nutrients and aging. The Mediterranean diet is rich in plant compounds that boost mitochondria (organelles in our cells that convert glucose and other nutrients into energy) and so are known as mitochondrial nutrients. When mitochondria are scarce or have genetic defects that keep them from working properly, this can generate toxic metabolites and damaging free radicals.
“Mitochondria are central to aging,” says UC Irvine aging expert Edward Sharman. “Improving their function may modulate or delay the onset of diseases related to aging, such as type 2 diabetes and age-related macular degeneration.” Mitochondrial dysfunction also plays a key role in chronic illnesses such as heart disease, type 2 diabetes and inflammatory diseases such as arthritis.
A new essential nutrient? Another promising mitochondrial nutrient is pyrroloquinoline quinone (PQQ), which was first found in nitrogen-fixing soil bacteria and is now known to be ubiquitous.
“We’re exposed to PQQ all the time at low levels,” says CHNR co-director Robert Rucker, a UC Davis nutrition professor. “It can be derived from amino acids found in stellar dust, and stellar dust is what the earth is made of.”
While Escherichia coli and other common gut bacteria do not make PQQ, the soil bacteria provide it to the plants in our diet. Good sources include fermented soybeans, wine, tea and cocoa.
Animal studies show that PQQ affects health markedly. Rucker and his colleagues found that depriving rats of PQQ compromised their immune systems, and retarded their growth and reproductive rates. In contrast, restoring PQQ to their diets reversed these effects and returned them to good health. Moreover, PQQ stimulated nerve growth and counteracted aging in cultured cells.
Rucker and his colleagues found that, like hydroxytyrosol, PQQ increases the number of mitochondria in cells. “It’s also an extremely good antioxidant and anti-inflammatory agent,” he says.
Personalized medicine. Understanding what biofactors do in our bodies could ultimately lead to personalized medicine, where nutrition-based treatments are tailored to the particulars of each person’s biochemistry. This individual variation at the biochemical level may help explain the inconsistent outcomes of research on omega-3 fatty acids and inflammation.
“The studies are mixed,” says UC Davis pulmonologist Nicolas Kenyon. “Some have shown little effect and others have shown that omega-3 fatty acids can reduce arthritis and inflammation in blood vessels.”
This genotyping is targeted to DNA sequences associated with asthma and so is not comprehensive.
“Some people are nervous about genome-wide analysis, which is scary because none of us is perfect,” Kenyon says. “But people are more interested when the focus is specific screening that could increase their chances of treatment.”
Nuts contribute protein, fiber and healthy fat to diet
Two free publications on nuts have recently been published by ANR — Nuts: Safe Methods for Consumers to Handle, Store, and Enjoy and Nuts: Safe Methods for Home Gardeners to Harvest, Store, and Enjoy.
Both publications outline the nutritional benefits of eating nuts, including information from the FDA affirming that:
- Including nuts in a diet low in saturated fat and cholesterol may help reduce the risk of heart disease.
- Almonds, pecans, pistachios, and walnuts contribute to health through their protein, dietary fiber and unsaturated fat.
The consumer publication includes a handy table outlining optimal freezer and refrigerator storage times for a variety of nuts as well information on nut allergies, nutrition and resources for recipes.
Home gardeners with nut trees will find useful information on harvest times and methods, hulling and drying procedures, safe handling procedures, storage, and nutrition information for almonds, chestnuts, pecans, pistachios and walnuts.
Inside both publications is a discussion of recent bacterial outbreaks in nuts and the steps producers have taken to minimize the risk of exposure to consumers.
San Francisco meeting generates research buzz
A meeting this week of the American Chemical Society turned two interesting UC research projects into headline news.
UC Davis nutrition professor Paul Davis reported that walnuts slowed prostate tumors by 30 percent to 40 percent in mice, according to a UPI article. The dose was equivalent to 2.5 ounces for a typical man. Not only was prostate cancer growth reduced, but the mice had lower blood levels of a protein that is strongly associated with prostate cancer.Completely unrelated research presented at the meeting, also from UC Davis, questioned an often-quoted UN statistic that said animal agriculture produces 18 percent of greenhouse gas emissions, more than all transportation combined.
Air quality specialist Frank Mitloehner says the U.N. reached its conclusions for the livestock sector by adding up emissions from farm to table, including the gases produced by growing animal feed, animals' digestive emissions, and processing meat and milk into foods. However, for transportation it only considered emissions from fossil fuels burned while driving, according to a CNN story.
"This lopsided 'analysis' is a classical apples-and-oranges analogy that truly confused the issue," Mitloehner was quoted in the original UC Davis news release announcing his results.
At least one blogger wasn't fully convinced that the world can go back to eating meat guilt free. The writer of Guardian UK Environment Blog, Leo Hickman, wondered why more media outlets hadn't reported that Mitloehner receives a significant amount of research funding from the meat industry."I'm not saying that Mitloehner is a bought-off scientist in the pocket of Big Beef. . .," Hickman wrote. "My beef is that this funding information has not been deemed worthy of inclusion in the reports and blogs that have been so quick to leap on Mitloehner's findings as, in their eyes, further proof that environmentalists are just a bunch of unscientific cranks."
The American Chemical Society's national conference concludes today.
Frank Mitloehner
Food safety in walnuts an ongoing concern
The issue of food safety in walnuts was raised with more than 200 growers at the UC Cooperative Extension Sutter/Yuba/Colusa Walnut Day this week, according to an article in the Appeal-Democrat of Yuba County.
"We want our crop to be perceived as healthy to consumers and we want to grow a safe crop, too," the story quoted conference speaker Jennifer Getz, the California Walnut Board domestic marketing director.Consumers, farmers and regulators are concerned about E. coli and salmonella contamination in walnuts. The question, the article said, revolves around where pathogen problems begin and whether walnuts are susceptible. The U.S. Food and Drug Administration is stepping up inspections, and research and safety efforts are ongoing.
Increasing regulations in general is a significant challenge facing growers, Walnut Day participant Steven DeValentine told reporter Ashley Gebb. Regulations for environmental protection, worker safety and food safety raise expenses for farmers, he said, while food prices have been mostly stable the last 20 to 30 years.
According to the article, DeValentine said that he likes to attend the annual Walnut Day to stay on top of what is happening in his industry and he hopes budget cuts do not further impact research by the University of California.
"Without that we would not be able to maintain this competitive edge globally," DeValentine said.
A farmer admirers a walnut tree.