A SOBERING STATISTIC: ALCOHOL-RELATED DEATHS IN US HAVE DOUBLED SINCE 1999

By analyzing death certificates, researchers at the National Institute on Alcohol Abuse and Alcoholism (NIAAA) in Bethesda, Maryland, found that the rate of alcohol-related deaths in the US increased by 50 percent between 1999 and 2017 and the number of alcohol-related deaths per year doubled. This new research adds to the growing body of evidence that the mental, physical and social well-being of Americans is deteriorating.

 Alcohol-related deaths in US have doubled since 1999

Photo credit: Pixabay

Neuroscientist Aaron White and colleagues at the NIAAA analyzed data taken from all death certificates filed in the US between 1999 and 2017. Using listed causes of death and contributing factors they found that the rate of alcohol-related deaths of Americans 16 years old or older rose from 16.9 to 25.5 per 100,000 and the number of deaths per year doubled, from 35,914 to 72,558. Alcohol caused or contributed to the death of 944,880 Americans during that 18-year span. Their findings were published in Alcoholism: Clinical and Experimental Research.

"Rates increased for all age-groups except 160 to 20 and 75+," the researchers write, "and for all racial and ethnic groups except for initial decreases among Hispanic males and [Non-Hispanic] Blacks followed by increases."

Almost every group was impacted. The sharpest increase was among Non-Hispanic White women. Rates of acute alcohol-related deaths rose most among people aged 55 to 64, while death rates from chronic alcohol use surged most in younger people, aged 25 to 34, and accounted for the majority of alcohol-related deaths.

As worrisome as these documented trends are, the authors point out that previous research has shown that death certificates understate what's really happening; the actual number of alcohol-related deaths is likely significantly higher than they were able to document.

The authors of this paper don't speculate about the causes of this trend. We know that they are part of the growing number of "deaths from despair" that have characterized the US for the past decades. Other researchers cite both economic and social disparities and declines  as at least part of the cause. Needless to say, it's a multifaceted problem and requires an equally multifaceted set of solutions. However, until the current political balance shifts in Washington, the dislocations and inequities that underline this tragic slide are not likely to be acknowledged or addressed.

CLIMATE CHANGE "FINGERPRINTS" NOW VISIBLE IN GLOBAL WEATHER EVERY DAY

Talk about thinking outside the box--

For decades now, climate scientists have worked to detect and measure the signal of human-caused climate change over time. They've revealed and warned us about changes in important variables such as atmospheric CO2, sea level and global average temperature; profound changes, but ones that take place over decades.

Climate change deniers, up to and including President Trump, have jumped on the fact that these incremental changes are swamped by much larger local daily and seasonal variability, making it difficult to link climate change to the weather people actually experience--with the fairly recent exception of super-storms or other extreme weather events that would have been extremely unlikely in the absence of global warming.

Now, a team of Swiss and Norweigian researchers has broken the mold. What would they see, they wondered, if they looked at variables such as temperature and humidity across space--the whole Earth--rather than over time. They were prompted to pursue this question by one of Trump's tweets using a major cold spell that hit much of the US to try to ridicule global warming.

"This lead to a lively debate about whether a single day could be informative at all about climate change," says climate scientist Reto Knutti, part of the Swiss-Norwegian research team. "Weather is not climate, yet we are seeing the imprint of climate change now in some single events, e.g. in the frequency of strong heatwaves. But what about the weather on an average day? Could we detect climate change in a single year, a month, a day?"

The answer they found is astonishing. Just by analyzing weather patterns across the globe they were able to detect the fingerprints of climate change on every day's weather since 2012.

Climate scientists can now detect signals of global warming in any day's weather

Image credit: NASA/MODIS

"Global weather is now in uncharted territory," says Knutti. "While locally of course we need a few decades for a signal to emerge from variability, the global information allows us to now detect climate change for any single day since early 2012."

The team used artificial intelligence (AI) to extract indicative patterns from the enormous mass of daily weather data around the globe. They could then test for the probability that the pattern for any given day could have appeared in the absence of climate change.

The daily weather patterns that most powerfully reveal the impact of climate change involve the global distribution of air temperature and humidity. Both variables were more pronounced over oceans than over land masses, and in the tropics compared to higher latitudes.

In retrospect, it may not be surprising that the cumulative heating effect of many decades of climate change is visible in the day-to-day distribution of temperatures across the globe. However, the researchers also found that they could still detect a strong climate change fingerprint in any given day's weather even without looking at temperature--simply from the pattern of atmospheric moisture around the world. "If we include humidity," says Knutti, "we can even detect climate change when we remove the global mean [temperature] signal for every single day, i.e. just by looking at the patterns."

If there was still any legitimate doubt that we humans have changed and are continuing to change the climate and the weather, this new way of charting the relationship between climate and weather should erase it.

Knutti writes, "In the last full IPCC report in 2013 we have shown that humans are the dominant cause of the long-term warming." We now demonstrate that since then we haven't had a single day of 'normal' weather globally. Yesterday was climate change, today is climate change, and tomorrow will be as well. We think this is a powerful message."

We couldn't agree more. The question is, is it powerful enough to get through to the deliberately deaf ears of our leaders?

-----

You can access the Nature Climate Change article describing this research here.

-----

REA

NEW EVIDENCE: EXERCISE BOOSTS YOUR BRAIN

We all know that exercise is good for us, and if done right can build muscles, physical strength and cardiovascular fitness. Now new evidence is emerging that physical exercise is good for our brains as well.

Publishing in the Mayo Clinic Proceedings, a group of physicians and epidemiologists at the German Center for Neurodegenerative Diseases detail a large study measuring and comparing the cardiorespiratory fitness (CRF) and brain volume of 2103 German women and men between the ages of 21 and 84. The researchers found that fitter participants had significantly greater brain volume than their less-fit peers.

Physical fitness may also boosts brain fitness
Photo credit: Michael (Mike) L. Baird

Interestingly, highly detailed magnetic resonance images (MRIs) of the participant's brains showed that the parts of the brain that benefitted most from increased fitness were not areas associated with movement or coordination, but instead areas involved in thinking and--seniors take note--memory. The effects on the hippocampus, crucial for memory, were especially strong in older participants.

"This is another piece of the puzzle showing physical activity and physical fitness is protective against aging-related cognitive decline," says Michael Joyner, a Mayo Clinic anesthesiologist. He and two Mayo Clinic colleagues wrote an editorial to accompany the research report. They note that while previous research has linked exercise, physical fitness, blood flow to the brain, and cognitive functioning, this is the first research to show beneficial changes to the grey matter of the brain.
". . . these data are encouraging," says Clifford Jack Jr., a neuroradiologist at Mayo Clinic. "The findings regarding cardiorespiratory fitness and certain brain structures are unique."

You can read an earlier zerospinzone post about research linking exercise and brain connectivity here.

The new study's authors point out that while their cross-sectional research clearly showed that CRF and brain volume and structure are correlated, it can't prove cause and effect-- ". . . reverse causation (i.e., individuals with greater brain volumes have higher CRF) cannot be excluded," they write.

Even with that caveat, the researchers and the Mayo Clinic commentators conclude that these findings justify large-scale studies that follow participants over time to see if exercise and improved physical fitness actually help preserve grey matter in aging brains, or possibly even stimulate growth in regions of the brain such as the frontal lobes or hippocampus.

-----

You can access the full research paper and editorial commentary at this link. 

-----

 REA