Author: José Betancourt

What kind of diet make you lives the longest? Meat or Vegetarian?

Our ability to live a long life is influenced by a combination of our genes and our environment. In studies that involve identical twins, scientists have estimated that no more than 30% of this influence comes from our genes, meaning that the largest group of factors that control how long a person lives is their environment. Of the many possible environmental factors, few have been as thoroughly studied or debated as our diet. Calorie restriction, for example, is one area that is being investigated. So far, studies seem to show that restricting calories can increase lifespan, at least in small creatures. But what works for mice doesn’t necessarily work for humans. What we eat – as opposed to how much we eat – is also a hot topic to study and meat consumption is often put under the microscope. A study that tracked almost 100,000 Americans for five years found that non-meat eaters were less likely to die – of any cause – during the study period than meat eaters. This effect was especially noticeable …

Does endurance exercise suppresses the immune system?

Does endurance exercise suppresses the immune system?

It is commonly believed that some forms of exercise, such as endurance events, suppress your immune system and leave you at risk of infections, like the common cold. However, our latest review of the evidence suggests that this is probably not true. In fact, exercise seems to boost the immune system. The idea that endurance exercise suppresses the immune system stems from research in the 1980s and 1990s. In these studies, competitors of endurance running events, such as the Los Angeles Marathon, were asked if they had symptoms of infections in the days and weeks after the race. Many did, leading to the idea that endurance exercise increases infection risk. An overlooked problem in many of these studies was that symptoms of “infections” were not confirmed in a lab, so it wasn’t known if they were genuine illness symptoms. More recent studies have shown that most symptoms reported after marathons are not real infections. Instead, the symptoms are caused by other factors, such as allergy. These earlier studies put the cause of the increased risk …

Genetic Engineering to Clash With Evolution

Genetic Engineering to Clash With Evolution

In a crowded auditorium at New York’s Cold Spring Harbor Laboratory in August, Philipp Messer, a population geneticist at Cornell University, took the stage to discuss a powerful and controversial new application for genetic engineering: gene drives. Gene drives can force a trait through a population, defying the usual rules of inheritance. A specific trait ordinarily has a 50-50 chance of being passed along to the next generation. A gene drive could push that rate to nearly 100 percent. The genetic dominance would then continue in all future generations. You want all the fruit flies in your lab to have light eyes? Engineer a drive for eye color, and soon enough, the fruit flies’ offspring will have light eyes, as will their offspring, and so on for all future generations. Gene drives may work in any species that reproduces sexually, and they have the potential to revolutionize disease control, agriculture, conservation and more. Scientists might be able to stop mosquitoes from spreading malaria, for example, or eradicate an invasive species. The technology represents the first …

How Many Genes Do Cells Need?

How Many Genes Do Cells Need?

By knocking out genes three at a time, scientists have painstakingly deduced the web of genetic interactions that keeps a cell alive. Researchers long ago identified essential genes that yeast cells can’t live without, but new work, which appears today in Science, shows that looking only at those gives a skewed picture of what makes cells tick: Many genes that are inessential on their own become crucial as others disappear. The result implies that the true minimum number of genes that yeast — and perhaps, by extension, other complex organisms — need to survive and thrive may be surprisingly large. About 20 years ago, Charles Boone and Brenda Andrews decided to do something slightly nuts. The yeast biologists, both professors at the University of Toronto, set out to systematically destroy or impair the genes in yeast, two by two, to get a sense of how the genes functionally connected to one another. Only about 1,000 of the 6,000 genes in the yeast genome, or roughly 17 percent, are considered essential for life: If a single …

Down side of daydreaming

Daydreaming is one of life’s great joys. You can indulge in it when you’re stuck in a boring meeting or a long queue. This seemingly innocuous pastime, however, is a double-edged sword. Some research has found that it boosts creativity, but other studies suggest that it is bad for your mental health and could lower your intelligence. Before we look at the downside to daydreaming, let’s first look at the positive side. In a studyconducted by psychologists at the University of California, Santa Barbara, undergraduate students were asked to come up with as many uses for everyday objects – such as toothpicks, clothes hangers and bricks – as they could in two minutes, take a 12-minute break, and then repeat the exercise. The students were able to generate more creative uses for the objects the second time around if their break involved completing an undemanding task, which is known to promote more daydreaming, compared with a break filled with a more attention-demanding task, known to reduce daydreaming. Daydreaming has also been linked with feeling socially …

How build a colony on an alien world?

If the human race is to survive in the long-run, we will probably have to colonise other planets. Whether we make the Earth uninhabitable ourselves or it simply reaches the natural end of its ability to support life, one day we will have to look for a new home. Hollywood films such as The Martian and Interstellar give us a glimpse of what may be in store for us. Mars is certainly the most habitable destination in our solar system, but there are thousands of exoplanets orbiting other stars that could be a replacement for our Earth. So what technology will we need to make this possible? We effectively already have one space colony, the International Space Station (ISS). But it is only 350km away from Earth and relies on a continuous resupply of resources for its crew of six. Much of the technology developed for the ISS, such as radiation shielding, water and air recycling, solar power collection, is certainly transferable to future space settlements. However, a permanent space colony on the surface of …

How to help Vaccine Doubters

We are in the golden age for vaccines. We have dozens of highly effective vaccines licensed for infectious disease, promising new technologies contributing to massive advancement of vaccine development, and several promising vaccines on the horizon. Unfortunately, vaccines have been a victim of their own success. With the drastic reduction of once-devastating diseases like whooping cough and measles, it seems like some parents think that the vaccines themselves are the new danger. But the threat isn’t gone; it’s been kept at bay by vaccinations. With clusters of vaccine-hesitant individuals especially worrisome, we need to find effective ways to convince people that the true danger is still disease. Concerns about the chemical components of vaccines, government mandates of vaccinations for school entry, and “Big Pharma” pushing vaccination seem unchanged when facts countering these claims are presented. Most of the existing research focuses on providing education or addressing parental vaccine attitudes, but rarely addresses the values people hold. We know that a host of factors influence how people retain and use facts in their decision-making, and most …

Centuries of Catalonia’s cultural struggle against Madrid

Centuries of Catalonia’s cultural struggle against Madrid

Like all constitutions, the 1978 Spanish constitution is a product of a very specific historical moment. General Francisco Franco had died in 1975 and his political heirs understood the need for change: Francoism without Franco in a rapidly modernising country was not sustainable. The democratic parties, including the Catalan nationalists, recognised they were too weak to impose a clean break and bring Franco’s henchmen to justice. The constitution was a pact between the most forward-looking Francoists and a heterogeneous opposition prepared to turn a blind eye to atrocities committed by Franco’s so-called nationalists during the Civil War and nearly four decades of dictatorship. It is from this uneasy compromise that all recent political upheaval in Catalonia stems – including the latest instalment, the region’s election on December 21. To understand the conflict, however, you have to go back much further than 1978. Neither can you confine yourself to politics; everything is underpinned by the rise of Catalan culture and its battle to express itself. Renaissance years Today’s Catalan nationalism has its origins in the 19th-century …

Facts on Diet and Inflammation

In health, as with so many things, our greatest strength can be our greatest weakness. Take our astonishingly sophisticated response to injury and infection. Our bodies unleash armies of cellular troops to slaughter invaders and clear out traitors. Their movements are marshaled by signaling chemicals, such as the interleukins, which tell cells where and when to fight and when to stand down. We experience this as the swelling, redness and soreness of inflammation—an essential part of healing. But when the wars fail to wind down, when inflammation becomes chronic or systemic, there’s hell to pay. I’m looking at you, arthritis, colitis and bursitis, and at you, diabetes, colon cancer, Alzheimer’s and cardiovascular disease. Cardiovascular disease is the world’s biggest killer, and we’ve known for 20 years that inflammation (along with too much cholesterol) ignites the buildup of plaque in our arteries. Still, no one knew if runaway inflammation could actually pull the trigger on heart attacks and strokes—until this summer. Results from a large, well-designed trial showed that certain high-risk patients suffered fewer of these …

How Constitutions Reveal about How Societies Evolve

Timing can be everything when it comes to successfully expanding constitutional rights. Now, a study looking at how constitutions around the world have evolved has revealed patterns that could help people predict the best moment to introduce such changes. Amendments are generally introduced into a country’s constitution in a certain sequence, the authors report in a paper on the preprint server arXiv, and now under review at a journal. In addition, their computer analyses corroborate previously proposed ideas that the addition of some provisions is heavily influenced by the zeitgeist—the dominant social mores of the time—whereas the adoption of others reflects a country’s colonial history. The study validates computational techniques that could be applied to pressing questions about how constitutions reflect and affect societies, says Mila Versteeg, a legal scholar at the University of Virginia in Charlottesville. “These methods might be able to move the ball if applied to the right questions,” she says. Organizations and advocates could use the results to push for policies in a more strategic way, say the paper’s authors. “This can …