A new study has provided a link between drinking behaviors with the overall mortality rate.

A new University of Colorado Boulder study involving some 40,000 people indicates that social and psychological problems caused by drinking generally trump physically hazardous drinking behaviors when it comes to overall mortality rates.

The study showed, for instance, that participants who had experienced an intervention by physicians, family members or friends had a 67 percent greater risk of death over the 18-year study period, said sociology Professor Richard Rogers, lead study author. Those who reported cutting down on social or sports activities because of alcohol use had a 46 percent higher risk of death over the same period.

In contrast, issues like driving after drinking too much or engaging in other physically risky behaviors did not result in a significant uptick in mortality rates.The new study also showed social risks of drinking, from losing jobs to having spouses threaten to leave, were equally or more strongly linked to mortality than physiological consequences of alcohol abuse like withdrawal jitters or becoming physically ill.

One of the most unexpected findings was that of those who identified themselves as light drinkers, consuming less than one drink a day, 48 percent reported having some problem with alcohol in the 12 months prior to the survey.

The research data allowed the CU-Boulder team to investigate the mortality associated with 41 separate drinking problems including drinking more than intended, unsuccessfully trying to cut back, driving a car after drinking too much, losing ties with friends and family, missing work with hangovers, drinking more to get the same effect, depression and arrests.

It was also found that 23 percent started drinking without intending to, 20 percent drank longer than expected and 25 percent experienced a strong urge to drink. For those who experienced a strong urge to drink over the past year, 19 percent were light drinkers, 40 percent were moderate drinkers and 57 percent were heavy drinkers.

Current drinkers who found it difficult to stop once they started had a 15 percent higher risk of death over the follow-up period; those who acknowledged going on a drinking bender during the past 12 months had a 54 percent higher mortality rate; and those who blacked out during the previous 12 months prior to the assessment had a 22 percent higher mortality rate over the 18-year study period.

The new study also showed those who reported attending Alcoholics Anonymous meetings in the past year had a 45 percent higher risk of mortality.

But those results likely are somewhat misleading in that some of those people could have recently have been diagnosed as alcoholics or were more likely to have severe health, social or legal problems, including required AA attendance. In addition, those who reported attending AA might have had increased risk of mortality due to smoking or may have had other substance abuse problems.

The study is published in the journal Drug and Alcohol Dependence.

Physical activities such as walking helps older adults lessen age-related decline in brain structure, says a new research.

The researchers found the relationship between fitness and brain structure only in older adults, but not younger adults.

"We found that higher levels of cardiorespiratory fitness were associated with enhanced brain structure in older adults," explained study author Scott Hayes, assistant professor of psychiatry at Boston University School of Medicine.

"We found that physical activities that enhance cardio-respiratory fitness, such as walking, are inexpensive, accessible and could potentially improve quality of life by delaying cognitive decline and prolonging independent function," he noted.

Cardio-respiratory fitness refers to the ability of the circulatory and respiratory systems to supply oxygen to skeletal muscles during sustained physical activities.

For the study, the researchers compared younger adults (age 18-31) to older adults (age 55-82). All participants had magnetic resonance imaging (MRIs) taken of their brains and their cardiorespiratory (heart and lung) fitness was measured while they exercised on a treadmill.

The researchers found cardio-respiratory fitness was positively linked to the structural integrity of white matter fiber bundles in the brain in the older adults, while no such association was observed in younger adults.

"We hope this study provides additional motivation for older adults to increase their levels of physical activity, which positively impacts health, mood, cognition and the brain," Hayes said.

The findings appeared online in the journal Annals of Clinical and Translational Neurology.

Indian researchers have developed a new therapy that has been found to reverse Parkinson's-like symptoms in rats and the researchers believe that the findings could one day lead to a new therapy for human patients.

The researchers found that infusing the chemical dopamine into the brain can relieve symptoms in animal models of the disease.

"We designed neurotransmitter dopamine-loaded PLGA nanoparticles (DA NPs) to deliver dopamine to the brain," said Rajnish Kumar Chaturvedi and his colleagues from CSIR-Indian Institute of Toxicology Research in Lucknow, Uttar Pradesh.

Patients who develop this disease usually start experiencing symptoms around age 60 or older. The researchers noted that among other issues, people with Parkinson's lack dopamine in the brain.

Dopamine is a chemical messenger that helps nerve cells communicate with each other and is involved in normal body movements. Reduced levels cause the shaking and mobility problems associated with Parkinson's.

Symptoms can be relieved in animal models of the disease by infusing the compound into their brains.

But researchers have not yet figured out how to safely deliver dopamine directly to the human brain, which is protected by something called the blood-brain barrier that keeps out pathogens, as well as many medicines.

The researchers wanted to find a way to overcome this challenge.

They packaged dopamine in biodegradable nanoparticles that have been used to deliver other therapeutic drugs to the brain.

The resulting nanoparticles successfully crossed the blood-brain barrier in rats, released its dopamine payload over several days and reversed the rodents' movement problems without causing side effects.

The study was published in the journal ACS Nano.

A new research has examined that excess use of vitamins and dietary supplements can increase the risk of cancer.

The study conducted by University of Colorado Denver suggested that over-the-counter supplements may actually increase cancer risk if taken in excess of the recommended daily amount.

Tim Byers, associate director for cancer prevention and control at the CU Cancer Center asserted that they were not sure why this was happening at the molecular level but evidence showed that people who take more dietary supplements than needed tend to have a higher risk of developing cancer.

One trial exploring the effects of beta-keratin supplements showed that taking more than the recommended dosage increased the risk for developing both lung cancer and heart disease by 20 percent. Folic acid, which was thought to help reduce the number of polyps in a colon, actually increased the number in another trial.

Byers asserted that when they first tested dietary supplements in animal models they found that the results were promising and eventually they were able to move on to the human populations.

He continued that people can get the daily recommended doses of vitamins and minerals in their diets by eating healthy meal and that many adults who take vitamin supplements may not need them.

Byers concluded that at the end of the day they have discovered that taking extra vitamins and minerals did more harm than good.

A mushroom species native to Asia may boost immunity when eaten daily, a new study has claimed.

Researchers from the University of Florida found increased immunity in people who ate a cooked shiitake mushroom every day for four weeks.

In the study led by UF Food Science and Human Nutrition Professor Sue Percival, 52 healthy adults, age 21 to 41, were given a four-week supply of dry shiitake mushrooms, popular in countries like Japan and China.

Participants took the mushrooms home, cleaned and cooked them. Then they ate one, 4-ounce serving of mushrooms each day during the experiment.

Through blood tests before and after the experiment, researchers saw better-functioning gamma delta T-cells and reductions in inflammatory proteins.

"If you eat a shiitake mushroom every day, you could see changes in their immune system that are beneficial," said Percival.

"We're enhancing the immune system, but we're also reducing the inflammation that the immune system produces," Percival said.

To be eligible for the study, participants could not be vegans or vegetarians. They also could not drink tea, take antioxidant supplements or probiotics before the study.

They also could not consume more than 14 glasses of alcoholic beverages per week or eat more than seven servings of fruits and vegetables per day during the experiment.

Percival said the dietary restrictions were imposed because fibre, tea and probiotics help the body's immune system, so researchers didn't want to start with people who already had a strong immune system.

Additionally, alcohol could suppress immunity, Percival said.

The study was published in the Journal of the American College of Nutrition.