La libido est – aussi – dans notre assiette ! Omega-3, omega-6 supplement improves reading for children -- ScienceDaily. Supplement of omega-3 and omega-6 fatty acids may improve reading skills of mainstream schoolchildren, according to a new study from Sahlgrenska Academy, at the University of Gothenburg, Sweden. Children with attention problems, in particular, may be helped in their reading with the addition of these fatty acids.
The study included 154 schoolchildren from western Sweden in grade 3, between nine and ten years old. The children took a computer-based test (known as the Logos test) that measured their reading skills in a variety of ways, including reading speed, ability to read nonsense words and vocabulary. The children were randomly assigned to receive either capsules with omega-3 and omega-6, or identical capsules that contained a placebo (palm oil) for 3 months. The children, parents and researchers did not learn until the study was completed which children had received fatty acids and which had received the placebo. Polyunsaturated fats important for the brain. Broccoli v. French fries: Appealing to teens' impulse to rebel can curb unhealthy eating -- ScienceDaily.
It's no secret that the adolescent years can be challenging: young teens have a heightened sensitivity to perceived injustice and react against authority. And their newfound social conscience and desire for autonomy can motivate many of their decisions -- even food choices. A new study, "Harnessing Adolescent Values to Motivate Healthier Eating," by Christopher J. Bryan of the University of Chicago Booth School of Business, and David Yeager of the University of Texas, finds that by appealing to widely-held adolescent values, it's possible to reduce unhealthy eating habits and motivate better food choices among adolescents.
The paper was published September 12 in the Proceedings of the National Academy of Sciences. "Our goal here was to portray healthy eating as a way to take a stand against injustice -- to stand up for vulnerable people who lack the ability to protect themselves. " "We took a two-pronged approach to this," Bryan says. And it worked.
Phosphatidylsérine. Un article de Wikipédia, l'encyclopédie libre. La phosphatidylsérine (en abrégé : PS), est un phospholipide (deux acides gras estérifiés sur une molécule de glycérol, elle-même liée à un acide phosphatidique), dont le groupement phosphate est associé à un acide aminé, la sérine. Du fait de son caractère amphiphile, c'est un constituant des membranes plasmiques. Chez les mammifères, on la rencontre principalement du côté intracellulaire. Elle possède une charge nette négative. Or comme elle est principalement présente sur la face intracellulaire, elle est responsable de l'apparition d'une différence de potentiel entre le côté extra-cytosolique et le côté intra-cytosolique. En apparaissant sur le versant extracellulaire, c'est un signal d'apoptose cellulaire. La phosphatidylsérine fait partie de la famille des phospholipides qui sont des composés majeurs des membranes entourant les cellules de l’organisme.
Rôle fonctionnel[modifier | modifier le code] Cofacteur de la protéine kinase C (PKC). Don't scan so close to me: Sting's musical brain scanned -- ScienceDaily. What does the 1960s Beatles hit "Girl" have in common with Astor Piazolla's evocative tango composition "Libertango"? Probably not much, to the casual listener. But in the mind of one famously eclectic singer-songwriter, the two songs are highly similar. That's one of the surprising findings of an unusual neuroscience study based on brain scans of the musician Sting. The paper, published in the journal Neurocase, uses recently developed imaging-analysis techniques to provide a window into the mind of a masterful musician.
It also represents an approach that could offer insights into how gifted individuals find connections between seemingly disparate thoughts or sounds, in fields ranging from arts to politics or science. "These state-of the-art techniques really allowed us to make maps of how Sting's brain organizes music," says lead author Daniel Levitin, a cognitive psychologist at McGill University. Lab tour with a twist Unexpected connections. Declining dopamine may explain why older people take fewer risks -- ScienceDaily. Older people are less willing to take risks for potential rewards and this may be due to declining levels of dopamine in the brain, finds a new UCL study of over 25,000 people funded by Wellcome. The study, published in Current Biology, found that older people were less likely to choose risky gambles to win more points in a smartphone app called The Great Brain Experiment.
However, they were no different to younger participants when it came to choosing risky gambles to avoid losing points. It is widely believed that older people don't take risks, but the study shows exactly what kind of risks older people avoid. The steady decline in risky choices with age matches a steady decline in dopamine levels. Dopamine is a chemical in the brain involved in predicting which actions will lead to rewards, and the researchers previously found that volunteers chose significantly more risky gambles to win more money when given a drug that boosted dopamine levels. Telomere extension turns back aging clock in cultured human cells, study finds -- ScienceDaily. A new procedure can quickly and efficiently increase the length of human telomeres, the protective caps on the ends of chromosomes that are linked to aging and disease, according to scientists at the Stanford University School of Medicine. Treated cells behave as if they are much younger than untreated cells, multiplying with abandon in the laboratory dish rather than stagnating or dying.
The procedure, which involves the use of a modified type of RNA, will improve the ability of researchers to generate large numbers of cells for study or drug development, the scientists say. Skin cells with telomeres lengthened by the procedure were able to divide up to 40 more times than untreated cells. The research may point to new ways to treat diseases caused by shortened telomeres. Telomeres are the protective caps on the ends of the strands of DNA called chromosomes, which house our genomes. 'Turning back the internal clock' A paper describing the research was published today in the FASEB Journal. The pleasures and perils of protein: Fruit fly study reveals new clues to appetite and aging: First evidence that serotonin plays a role in guiding food choices and may influence lifespan -- ScienceDaily. If you're a human who's really hungry, a handful of nuts, a piece of cheese or a nice juicy steak may really hit the spot.
If you're a fruit fly, a nibble of yeast will do the trick. Why do we -- and those flies that sometimes inhabit our kitchens -- seek out protein-full foods when we're running on empty? And what does that preference mean for the odds of living a longer life, whether it's measured in decades for a human, or days for a fly? New research from a University of Michigan Medical School team suggests for the first time that a brain chemical may have a lot to do with both questions. In a new paper in the journal eLife, U-M scientist Scott Pletcher, Ph.D., and his team demonstrate the key role that the chemical called serotonin plays in the feeding habits and life spans of fruit flies.
The paper's first author is Jennifer Ro, Ph.D., now at Harvard Medical School. Reward in the brain A choice of entrees Next steps. Fruit flies with better sex lives live longer -- ScienceDaily. Sex may in fact be one of the secrets to good health, youth and a longer life -- at least for fruit flies -- suggests a new University of Michigan study that appears in the journal Science. Male fruit flies that perceived sexual pheromones of their female counterparts -- without the opportunity to mate -- experienced rapid decreases in fat stores, resistance to starvation and more stress. The sexually frustrated flies lived shorter lives. Mating, on the other hand, partially reversed the negative effects on health and aging.
"Our findings give us a better understanding about how sensory perception and physiological state are integrated in the brain to affect long-term health and lifespan," says senior author Scott D. Pletcher, Ph.D, professor in the Department of Molecular and Integrative Physiology at the U-M Medical School and research professor at the U-M Geriatrics Center. For decades, one of the most powerful ways to slow aging in different species was by limiting their food intake. To kill off parasites, an insect self-medicates with alcohol -- ScienceDaily. Alcoholic drinks aren't generally put into the category of health food, but in some cases they might be just the cure for nasty parasites. That's according to a study published online on February 16 in Current Biology showing that fruit flies will actually seek out alcohol to kill off blood-borne parasitic wasps living within them. The discovery offers some of the first evidence that alcohol might be used to fight infection, the researchers say.
"We found that environmental alcohol protects fruit flies from being parasitized by wasps, and that, even after being infected, fruit fly consumption of alcohol leads to death of the wasps growing within them," said Todd Schlenke of Emory University. "Surprisingly, fly larvae actively seek out ethanol-containing food when infected, showing they use alcohol as an antiwasp medicine.
" Wasp mothers will lay their eggs in fruit fly larvae. Their young hatchlings then eat the flies from the inside out. Sex-deprived fruit flies turn to alcohol, perhaps to fulfill a physiological demand for a reward -- ScienceDaily. After being deprived of sex, male fruit flies, known as Drosophila melanogaster, may turn to alcohol to fulfill a physiological demand for a reward, according to a study recently published in the journal Science.
Troy Zars, an associate professor of biological sciences at the University of Missouri and neurobiology expert, said that understanding why rejected male flies find solace in ethanol could help treat human addictions. "Identifying the molecular and genetic mechanisms controlling the demand for reward in fruit flies could potentially influence our understanding of drug and alcohol abuse in humans, since previous studies have detailed similarities between signaling pathways in fruit flies and mammals," Zars said. In the study, male fruit flies that had mated repeatedly for several days showed no preference for alcohol-spiked food. On the other hand, spurned males and those denied access to females strongly preferred food mixed with 15 percent alcohol. 101103171642. Positive psychological changes that occur during meditation training are associated with greater telomerase activity, according to researchers at the University of California, Davis, and the University of California, San Francisco.
The study is the first to link positive well-being to higher telomerase, an enzyme important for the long-term health of cells in the body. The effect appears to be attributable to psychological changes that increase a person's ability to cope with stress and maintain feelings of well-being. "We have found that meditation promotes positive psychological changes, and that meditators showing the greatest improvement on various psychological measures had the highest levels of telomerase," said Clifford Saron, associate research scientist at the UC Davis Center for Mind and Brain.
"The take-home message from this work is not that meditation directly increases telomerase activity and therefore a person's health and longevity," Saron said. 160204121956. Over the past decade, mindfulness meditation has been shown to improve a broad range of health and disease outcomes, such as slowing HIV progression and improving healthy aging.
Yet, little is known about the brain changes that produce these beneficial health effects. New research from Carnegie Mellon University provides a window into the brain changes that link mindfulness meditation training with health in stressed adults. Published in Biological Psychiatry, the study shows that mindfulness meditation training, compared to relaxation training, reduces Interleukin-6, an inflammatory health biomarker, in high-stress, unemployed community adults. The biological health-related benefits occur because mindfulness meditation training fundamentally alters brain network functional connectivity patterns and the brain changes statistically explain the improvements in inflammation. In addition to Creswell, the research team included CMU's Emily Lindsay, April Fairgrieve and Jennifer L. Systems biology research study reveals benefits of vacation, meditation -- ScienceDaily.
Scientists from the Icahn School of Medicine at Mount Sinai, the University of California, San Francisco, and Harvard Medical School used a rigorous study design to assess the biological impact of meditation compared to vacation. They examined the effect of meditation on gene expression patterns in both novice and regular meditators. The researchers found that a resort vacation provides a strong and immediate impact on molecular networks associated with stress and immune pathways, in addition to short- term improvements in well-being, as measured by feelings of vitality and distress. A meditation retreat, for those who already used meditation regularly, was associated with molecular networks characterized by antiviral activity. The molecular signature of long-term meditators was distinct from the non-meditating vacationers. The study involved 94 healthy women, aged 30-60. Researchers assessed self-reported measures of well being.