Drink alcohol for a longer life, say scientists, just not too much
Moderate drinking is associated with a longer lifespan in just about every population ever studied, says Dr. Claudia Kawas, professor of neurology at the University of California, Irvine.
If you're a certain age, you'll remember this lesson from biology class: the adult brain is fully formed at age 20, and each drink of alcohol kills one thousand neurons that can never be replaced. Science then discouraged drinking. But today's science is much better!
It turns out that moderate drinking—a few beers, wines, or cocktails each week—is associated with a longer lifespan in just about every population ever studied, says Dr. Claudia Kawas, professor of neurology and associate director of the Institute for Memory Impairments and Neurological Disorders at the University of California, Irvine.
Speaking at this year's meeting of the Association for the Advancement of Science (AAS), Dr. Kawas revealed some surprising new conclusions about the aging brain. Her comments drew primarily on the '90+ Study'—one of the largest studies of its kind—which has carefully analyzed over 1,800 individuals over the age of 90. Kawas spoke at a panel called "Why Some Older Adults Keep Memory and Brain Functions in Tact".
Once rare, individuals living into very old age are increasingly common. "All the children born today in the United States can expect to live until the age of 103," said Kawas, recalling how President Nixon would write centenarians a personal letter on their 100th birthday (a practice that is no longer sustainable).
"The sad part about this," said Kawas, "is we've added more years than we've added quality." Of individuals who reach 90 years of age, one-third have dementia, one-third have less severe cognitive decline, and one-third maintain excellent cognitive and motor skills. But what accounts for the variation? And can we use our knowledge to age better and more slowly?
On the topic of alcohol, Kawas referenced one illustrative cohort of the '90+ Study' composed of 14,000 individuals who were drinking alcohol at least as early as 1981. That cohort demonstrated that moderate alcohol consumption was associated with a longer lifespan. "I have no explanation for it," said Kawas, "but I do firmly believe that modest drinking is associated with longevity."
Longevity and cognitive ability, however, are two different things. Exercise, not alcohol, is associated with lower instances of dementia. And while there is a strong association between physical activity and staying mentally sharp, the causal relationship remains undefined.
As for those biology lessons about the static brain and how alcohol permanently kills neurons, Kawas said: "Now we know how completely wrong we were about that."
What do we see from watching birds move across the country?
- A total of eight billion birds migrate across the U.S. in the fall.
- The birds who migrate to the tropics fair better than the birds who winter in the U.S.
- Conservationists can arguably use these numbers to encourage the development of better habitats in the U.S., especially if temperatures begin to vary in the south.
The migration of birds — and we didn't even used to know that birds migrated; we assumed they hibernated; the modern understanding of bird migration was established when a white stork landed in a German village with an arrow from Central Africa through its neck in 1822 — draws us in the direction of having an understanding of the world. A bird is here and then travels somewhere else. Where does it go? It's a variation on the poetic refrain from The Catcher in the Rye. Where do the ducks go? How many are out there? What might it encounter along the way?
While there is a yearly bird count conducted every Christmas by amateur bird watchers across the country done in conjunction with The Audubon Society, the Cornell Lab of Ornithology recently released the results of a study that actually go some way towards answering heretofore abstract questions: every fall, as per cloud computing and 143 weather radar stations, four billion birds migrate into the United States from Canada and four billion more head south to the tropics.
"In the spring," the lead author Adriaan Dokter noted, "3.5 billion birds cross back into the U.S. from points south, and 2.6 billion birds return to Canada across the northern U.S. border."
In other words: the birds who went three to four times further than the birds staying in the U.S. faired better than the birds who stayed in the U.S. Why?
Part of the answer could be very well be what you might hear from a conservationist — only with numbers to back it up: the U.S. isn't built for birds. As Ken Rosenberg, the other co-author of the study, notes: "Birds wintering in the U.S. may have more habitat disturbances and more buildings to crash into, and they might not be adapted for that."
The other option is that birds lay more offspring in the U.S. than those who fly south for the winter.
What does observing eight billion birds mean in practice? To give myself a counterpoint to those numbers, I drove out to the Joppa Flats Education Center in Northern Massachusetts. The Center is a building that sits at the entrance to the Parker River National Wildlife Refuge and overlooks the Merrimack River, which is what I climbed the stairs up to the observation deck to see.
Once there, I paused. I took a breath. I listened. I looked out into the distance. Tiny flecks Of Bonaparte's Gulls drew small white lines across the length of the river and the wave of the grass toward a nearby city. What appeared to be flecks of double-crested cormorants made their way to the sea. A telescope downstairs enabled me to watch small gull-like birds make their way along the edges of the river, quietly pecking away at food just beneath the surface of the water. This was the experience of watching maybe half a dozen birds over fifteen-to-twenty minutes, which only served to drive home the scale of birds studied.
Explore how alcohol affects your brain, from the first sip at the bar to life-long drinking habits.
- Alcohol is the world's most popular drug and has been a part of human culture for at least 9,000 years.
- Alcohol's effects on the brain range from temporarily limiting mental activity to sustained brain damage, depending on levels consumed and frequency of use.
- Understanding how alcohol affects your brain can help you determine what drinking habits are best for you.
If you want to know what makes a Canadian lynx a Canadian lynx a team of DNA sequencers has figured that out.
- A team at UMass Amherst recently sequenced the genome of the Canadian lynx.
- It's part of a project intending to sequence the genome of every vertebrate in the world.
- Conservationists interested in the Canadian lynx have a new tool to work with.
If you want to know what makes a Canadian lynx a Canadian lynx, I can now—as of this month—point you directly to the DNA of a Canadian lynx, and say, "That's what makes a lynx a lynx." The genome was sequenced by a team at UMass Amherst, and it's one of 15 animals whose genomes have been sequenced by the Vertebrate Genomes Project, whose stated goal is to sequence the genome of all 66,000 vertebrate species in the world.
Sequencing the genome of a particular species of an animal is important in terms of preserving genetic diversity. Future generations don't necessarily have to worry about our memory of the Canadian Lynx warping the way hearsay warped perception a long time ago.
Artwork: Guillaume le Clerc / Wikimedia Commons
13th-century fantastical depiction of an elephant.
It is easy to see how one can look at 66,000 genomic sequences stored away as being the analogous equivalent of the Svalbard Global Seed Vault. It is a potential tool for future conservationists.
But what are the practicalities of sequencing the genome of a lynx beyond engaging with broad bioethical questions? As the animal's habitat shrinks and Earth warms, the Canadian lynx is demonstrating less genetic diversity. Cross-breeding with bobcats in some portions of the lynx's habitat also represents a challenge to the lynx's genetic makeup. The two themselves are also linked: warming climates could drive Canadian lynxes to cross-breed with bobcats.
John Organ, chief of the U.S. Geological Survey's Cooperative Fish and Wildlife units, said to MassLive that the results of the sequencing "can help us look at land conservation strategies to help maintain lynx on the landscape."
What does DNA have to do with land conservation strategies? Consider the fact that the food found in a landscape, the toxins found in a landscape, or the exposure to drugs can have an impact on genetic activity. That potential change can be transmitted down the generative line. If you know exactly how a lynx's DNA is impacted by something, then the environment they occupy can be fine-tuned to meet the needs of the lynx and any other creature that happens to inhabit that particular portion of the earth.
Given that the Trump administration is considering withdrawing protection for the Canadian lynx, a move that caught scientists by surprise, it is worth having as much information on hand as possible for those who have an interest in preserving the health of this creature—all the way down to the building blocks of a lynx's life.
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