Archive for category Stress
Posted by psychieblogger in 3 Fatty Acids, American Chemical Society, Chemical Compounds, Chemistry Institute, Chocolate Blueberries, Cognitive Health, Common Foods, Depakene, Depression, Dietary Recommendations, Drug Molecules, Flavor Components, Manic Depressive Disorder, Mental Alertness, Mood Effects, Mood Enhancers, Mood Modulators, Mood Swings, National Autonomous University, National Autonomous University Of Mexico, Omega 3 Fatty Acids, Pines Institute, Psychology, Research, Specific Foods, Stress, Striking Similarity, Valproic Acid on August 19, 2012
New research reveals that some common foods enhance moods with a striking similarity to valproic acid, a widely used prescription mood-stabilizing drug.
“Molecules in chocolate, a variety of berries and foods containing omega-3 fatty acids have shown positive effects on mood. In turn, our studies show that some commonly used flavor components are structurally similar to valproic acid,” said Karina Martinez-Mayorga, Ph.D., leader of the research team, which presented its findings at a meeting of the American Chemical Society.
Valproic acid, which is sold under brand names such as Depakene, Depakote and Stavzor, is used to smooth out the mood swings of people with manic-depressive disorder and related conditions, she said.
“The large body of evidence that chemicals in chocolate, blueberries, raspberries, strawberries, teas and certain foods could well be mood-enhancers encourages the search for other mood modulators in food,” she added.
While people have recognized the mood-altering properties of food for years, Martinez-Mayorga’s team is looking to identify the chemical compounds that moderate mood swings, help maintain cognitive health, improve mental alertness and delay the onset of memory loss.
Her study involved the use of techniques associated with chemoinformatics ― the application of informatic methods to solve chemical problems ― to screen the chemical structures of more than 1,700 food ingredients for similarities to antidepressant drugs and other agents with reported antidepressant activity.
She noted her team plans to move from analyzing the database to actually testing the flavor/mood hypothesis experimentally. The end result may be dietary recommendations or new nutritional supplements with beneficial mood effects, she said.
“It is important to remember that just eating foods that may improve mood is not a substitute for prescribed antidepressive drugs,” Martinez-Mayorga cautioned.
She added that eating specific foods and living a healthful lifestyle can generally boost moods for people who don’t require medication.
Karina Martinez-Mayorga, Ph.D., who described research done while working at the Torrey Pines Institute for Molecular Studies, is now with the Chemistry Institute at the National Autonomous University of Mexico.
Source: The American Chemical Society
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High levels of estrogen may help protect a woman from mood disorders, while low levels of the hormone can make a woman more susceptible to trauma at certain times in her menstrual cycle, according to new research by Harvard and Emory University neuroscientists.
Depression and anxiety disorders are twice as common in women as in men, but the reason for this gender difference has remained unclear. The new research, however, suggests that women are most at risk for symptoms of post-traumatic stress disorder (PTSD) when their estrogen is low during the menstrual cycle.
“PTSD is a disorder of recovery,” said author Mohammed Milad, associate professor of psychiatry at Harvard Medical School (HMS) and director of the Behavioral Neuroscience Laboratory at Massachusetts General Hospital (MGH).
Men may be less susceptible to mood disorders since testosterone is regularly converted into estrogen in the male brain, resulting in a more steady flow of estrogen.
In healthy women and female rats, estrogen calms the fear response, according to the Harvard researchers, who were led by Kelimer Lebron-Milad, an HMS instructor of psychiatry.
The Emory researchers, led by postdoctoral researcher Ebony Glover, proved that the same is true for women suffering from PTSD. The higher their blood levels of estrogen were when they completed a fear-extinction task, the less likely women were to act startled.
Both studies used “fear-conditioning” experiments, in which the participant is trained to fear a safe “conditioned stimulus” such as a colored shape, paired with a frightening or painful “unconditioned stimulus” like a shock to the finger or a puff of air to the neck or eye.
Overall, women or female rats showed less fear to the neutral stimulus when their estrogen levels were high rather than low.
PTSD is common in women after a trauma such as rape or sexual assault, which studies say are experienced by 25 to 30 percent of women in their lifetimes, and the symptoms last on average four times as long in women as in men after trauma.
This new research suggests the reason for this vulnerability may be the monthly menstrual change in estrogen.
“People are afraid to look into the influence of sex hormones on ‘fear learning’ and extinction,” said Mohammed Milad, “because it’s such a complex system.”
When Milad studied fear as a Ph.D. student, his lab used only male rats. But when he began to study fear in humans as a postdoctoral researcher, he saw that female data were much more variable.
“The data led me there,” to sex differences, Milad said. “Since females add variance, scientists have tended to avoid studying them” in rodent research, he said. Studies of the human brain would tend to combine men and women, assuming that neurological gender differences were minimal. But this attitude is changing.
In addition, since birth control pills affect estrogen levels, they may be used as a future treatment against post-traumatic stress.
The research is published in Biological Psychiatry.
Source: Biological Psychiatry