Whether it’s a quick call to ask what’s needed from the grocery store or catching up with a long-distance friend – people everywhere talk on cell phones while they’re driving. [Read more…]
New evidence about medical malpractice
May 6, 2013 By 2 Comments
More than 15,000 lawsuits are filed against doctors in the United States each year for medical malpractice, a claim that medical treatment caused injury or death to the patient, typically involving a medical error. [Read more…]
How gay marriage impacts the well-being of children
March 26, 2013 By 1 Comment
As the U.S. Supreme Court is set to consider a historic case on gay marriage, new evidence is available on how same-sex unions impact children. [Read more…]
New evidence about the federal food stamps program
March 20, 2013 By Leave a Comment
Nearly 45 million American receive help purchasing food each year through the Supplemental Nutrition Assistance Program (SNAP), commonly called food stamps. Here on EBL, we’ve written about the federal program in the past, specifically how it helps keep families out of poverty. [Read more…]
The latest evidence on Vitamin D
March 7, 2013 By 1 Comment
Keeping track of the latest evidence on which vitamin supplements to take can be confusing. Although new information is available regularly, mainstream media outlets don’t always report the full story, which can result in conflicting reports.
There is new, clear evidence this month: The U.S. Preventative Services task force is recommending that healthy, postmenopausal women should not take Vitamin D and calcium supplements to prevent fractures.
The task force – an independent panel of medical experts – reviewed more than one hundred medical studies before making their recommendation. It found insufficient evidence that taking vitamin D and calcium actually helps prevents fractures, and found a small risk of increased kidney stones for people who did take the supplements.
The task force’s recommendation does not apply to people suffering from osteoporosis or vitamin D deficiencies, or those living in skilled nursing facilities.
Cornell nutritionist Patsy Brannon has weighed in on the national debate over vitamin D supplements. Brannon was on the Institute of Medicine panel. While the panel recommended increasing the daily intake of vitamin D, it did not find that a deficiency is linked to chronic conditions such as cancer, diabetes and heart disease.
“The evidence available is inconsistent, with some studies demonstrating this association while others show no association, and still others show evidence of adverse effects with high blood levels of vitamin D,” Brannon told the Cornell Chronicle. Although we can’t conclude whether low vitamin D is associated with chronic disease, the evidence is clear that these vitamin supplements do not prevent fractures.
The case for taking aspirin
January 10, 2013 By 2 Comments
It’s always a pleasure to see a mainstream media outlet providing the big picture on medical therapies. So I was fascinated by a recent opinion piece in the New York Times which called for the increased use of aspirin.
In the article, cancer-researcher Dr. David Agus makes a clear case of the health benefits of aspirin. For years, the evidence has clearly established that aspirin reduced the risk of cardiovascular disease. In fact, he points out, the U.S. Preventative Services Task Force – an independent panel of health care experts – recommended aspirin for people up to 80 years old to prevent heart disease.
Now there is a growing body of solid evidence that aspirin also helps reduce the risk of cancer. Several major systematic reviews found that people who take an aspirin a day over the period of several years reduce their risk of developing cancer.
One major systematic review published by British researchers pulled together data on more than 77,000 patients from 51 separate clinical trials. It found some striking results: people who took aspirin daily were 15 percent less likely to die from cancer compared with those who didn’t take aspirin. They also had a 38 percent reduction in the risk of colorectal and gastrointestinal cancer. And for aspirin-takers who did get cancer, it was 38 percent less likely to spread to other parts of their bodies.
Other reviews have found that aspirin use not only reduces the risk of colorectal and gastrointestinal cancer but also decreases distant metastasis, the spreading of cancer to new regions of the body.
The take-home message: While people have been using aspirin for thousands of years, it was likely to be providing more health benefits than were ever realized.
HIV screening is essential
November 30, 2012 By 1 Comment
A new report from the U.S. Centers for Disease Control this week gave me pause: There are 60,000 new HIV infections in the U.S. each year. Nearly 25 percent of new HIV cases occur in people ages 13 to 24, and more than half of them don’t know they are infected. That means each year, more than 7,000 teen-agers and young adults contract a chronic, fatal disease without realizing it.
The good news is, researchers are uncovering new evidence on the best ways to help those newly-infected with HIV. Two new systematic reviews found broad-based routine screenings for HIV can help reduce the spread of the virus, and that screening during pregnancy helps reduce the chance the HIV virus will be transmitted from mother to child. Both were published in the Annals of Internal Medicine.
The first review included randomized trials and observational studies that compared HIV screening strategies, evaluated the effects of starting anti-retroviral therapy at different stages of the disease or reported how these kinds of interventions impacted the risk of transmission.
It concluded that only screening groups of people with a high risk of contracting HIV misses a substantial proportion of cases. Broad-based routine screening for HIV allows more people to start anti-retroviral therapies early in the course of HIV infection. This reduces their risk of sickness and death, and also reduces transmission of the virus to others.
The second review focused specifically on HIV-positive pregnant women. It included randomized trials and longitudinal studies that investigated the risks for a mother transmitting HIV to her unborn child, and the effects of prenatal HIV screening or antiretroviral therapy during pregnancy.
The review found that women who take antiretroviral therapy, avoid breastfeeding and elect to have a cesarean section reduce their risk of transmitting HIV to their child.
The bottom line: Contracting the HIV virus is still a real risk today, but routine screening and early treatment can make a positive impact on the health of HIV-positive patients and reduce the spread of the disease.
Editor’s note: Cornell’s Bronfenbrenner Center on Translational Research will offer streaming sessions from the 2012 International AIDS Conference.
What: Turning the Tide on HIV/AIDS: 2012 International AIDS Conference
When: 8:30 a.m . to 4:45 p.m. on Friday, December 7, 2012
Where: 102 Mann Library
Topics: Preventing mother-to-child transmission; structural inequalities and their impact on the HIV epidemic; strategies for “turning the tide together.
Visit the BCTR web site for more information.
The evidence on arsenic and rice
October 9, 2012 By 2 Comments
The magazine Consumer Reports released a study last month that revealed low levels of arsenic – a chemical element that is toxic when consumed in higher doses – in rice and rice products grown across the world.
The study tested 223 types of rice and rice products – such as rice-based cereals and rice milk – purchased in the United States in April, May and August of this year. It found arsenic in every product it tested, and dangerous levels of inorganic arsenic in dozens of products. Consumer Reports the story points out that their study is “a spot check of the market and “too limited to offer general conclusions about arsenic levels in specific brands within/across rice product categories.” Nevertheless, their article raises some surprising questions about toxins in our food supply.
Following the Consumer Reports study, the U.S. Food and Drug Administration released some preliminary results of a long-term study on arsenic levels in our food supply. Their study found levels of arsenic in rice similar to the Consumer Reports study.
So, what’s a rice-lover to do? Consumer Reports recommends limiting consumption of rice and rice products, while the FDA is not recommending any limits on rice consumption.
Since the FDA and Consumers Reports found the same level of arsenic in food, the question in my mind is: Exactly how dangerous is low-level exposure to arsenic? A search of systematic reviews yielded some interesting results.
- One meta-analysis found consuming arsenic in drinking water is associated with a higher risk of lung cancer.
- Another analysis found chronic arsenic exposure can lead to mental retardation and developmental disabilities such as physical, cognitive, psychological, sensory and speech impairments – although in higher levels that measured in the rice products tested by Consumer Reports and the FDA.
- Other analyses found inconclusive results on the relationship between arsenic exposure and diabetes and arsenic exposure and cardiovascular disease – although both of these reviews identified limitations in the study methodology and called for additional research.
My plan is to think more carefully about the rice products my family consumes. I’m not going to throw out the brown rice in my pantry, and we will still enjoy stir fry and sushi on a regular basis. But I certainly plan to steer way from rice cereals and other rice products at the grocery store.
The facts on Social Security
October 1, 2012 By Leave a Comment
More than 75 years ago, the U.S. government created Social Security, the federal insurance program that provides benefits to individuals and their families who can no longer work because of disability, retirement or death. The program is complex, and its details are often debated among politicians.
Earlier this year, the Economic Policy Institute and the National Academy of Social Insurance published a guide that explains the facts about the Social Security program to young people. The document includes detailed, evidence-based explanations of Social Security’s history, beneficiaries, financing, and shortfalls. It pulls data from the Office of the Chief Actuary of the Social Security Administration, Congressional Budget Office, the Employee Benefits Research Institute, and the Center for Retirement Research.
Here’s a sampling of interesting facts from the document:
- In 2012, about 159 million individuals or 94% of the American workforce, worked in Social Security-covered employment. (Those not covered include government employees covered by other insurance programs, farm workers who do not meet minimum work requirements and students.)
- Approximately 55 million Americans received Social Security benefits in 2011. Seventy percent were retirees; 19 percent were disability beneficiaries and 11 percent were survivors of deceased workers.
- Without Social Security income, it is estimated that nearly half senior citizens would be living in poverty. Instead, fewer than 10 percent of seniors live in poverty.
- Because the U.S. population is aging and people are living longer, the Social Security program is projected to run up a deficit. The projected shortfall is 2.67% of taxable earnings over the next 75 years.
- There are a variety of ways to compensate for the deficit including raising taxes, expanding coverage, investing in equities, increasing the retirement age and reducing cost-of-living increases.
The guide concludes that Social Security fulfills an important need in our society as an insurance program for American workers. To learn more about Social Security benefits and about how your payroll taxes are used, it’s worth checking out this evidence-based document.
The science of political campaigns, Part 2
September 21, 2012 By Leave a Comment
Next month, President Barack Obama and Republican Presidential Candidate Mitt Romney will face off on national television on four separate occasions to share their ideas for governing America and explain why voters should chose them.
While it’s not clear how many Americans make their voting decisions based on the debates, we do know they are an important part of the campaign. So I was thrilled to find some evidence on how to consider the candidates responses critically.
Todd Rogers, a behavioral psychologist at Harvard University, is among a growing group of researchers applying social science to issues effecting political campaigns. (We’ve written about his work on get-out-the-vote phone calls.) He wanted to address the issue of how candidates respond when get asked a question that they don’t want to answer – and whether the public notices when politicians dodge a question by talking about a different topic instead.
Rogers and his colleague Michael Norton, an associate professor at the Harvard Business School, designed a study to determine under what conditions people can get away with dodging a question, and under what conditions listeners can detect what’s happening.
In their study, published in the Journal of Experimental Psychology, they recorded a speaker answering a question about universal healthcare. Then they paired that answer with three separate questions: the correction question about health care, one about illegal drug use and another about terrorism. They showed the three question-and-answer pairings to separate groups of people and asked them to rate the truthfulness of the speaker.
Their research found that when the question and answer sounded somewhat similar – such as in the case where the speaker was asked about drug use but responded about healthcare – the audience rate the speaker as trustworthy. (In fact, most of the people who head the answer about illegal drug use couldn’t even remember the question.) But when the answer was very clearly addressing a different topic – such as when the speaker was asked about health care but responded about terrorism – the audience detected the dodge.
In another part of the study, Rogers and Norton used the same questions and answers, but posted the question on the screen in for some viewers. They found viewers who saw the question posted on the screen while the speaker answered were more than twice as likely to detect a dodge, even in subtle cases.
Rogers advocates for posting the questions on the screen during the presidential candidates debates, although he concedes it’s unlikely to happen this year.
You can hear an interview with Rogers and learn about other research on political campaigning in last week’s episode of NPR’s Science Friday.
New evidence: Vitamin D helps prevent falls
August 9, 2012 By 1 Comment
Vitamin D is one of those supplements that makes it into the news media frequently. Here on EBL, we’ve written before about the U.S. Institute of Medicine’s recommendations on Vitamin D intake.
Now there is a new recommendation that taking Vitamin D supplements can help prevent falls in people over 65 years old with a higher risk of falling.
In a review of nine separate studies, the United States Preventative Services Task Force came to the conclusion a daily dose of 800 international units reduced the risk of falling by about 17 percent, compared with those who did not take the vitamin.
“The exact mechanism is not known, but it seems to help muscle strength and balance,” Dr. Al Siu, vice chairman of the task force and chairman of the geriatrics and palliative medicine department at Mount Sinai School of Medicine, told the New York Times.
The panel also made two other recommendations. Doctors should do a comprehensive assessment of patients’ risk of falling – including asking about falling history and observing patients stand up and walk – to identify those at higher risk. And patients’ should exercise to improve strength and balance.
Falls are the leading cause of injury in adults 65 and older. While there’s no sure-fire way to prevent them, we have evidence that some interventions do work. That’s important information for all of us to know.
Move it or lose it: Real evidence on physical activity
July 31, 2012 By 1 Comment
In honor of the 2012 London Olympics, the British medical journal The Lancet published a series of publications about the state of physical fitness across the globe.
The series includes a plethora of new evidence:
- One large-scale report collected data on physical activity levels for adults 15 years or older from 122 countries worldwide. It found that more than 31 percent of adults are physically inactive. The researchers found that inactivity levels rise as people get older, and the women are less likely to be active than men. It also found that physical inactivity is more problematic in higher-income nations.
- A far-reaching analysis in the series uses advanced statistical methods of quantify the health implications of physical inactivity on the major non-communicable diseases in 122 countries across the globe. The authors concluded inactivity was a contributing factor to heart disease, diabetes, breast cancer and colon cancer. The estimated that 9 percent of premature death across the word were related to physical inactivity.
- Another article provides a comprehensive review of evidence-based strategies for promoting physical activity. The review found that community and mass media informational campaigns helped encourage people to get moving. It also found that schools and worksites are good venues for promoting physical activity through education, sports and social groups. Finally, the authors found that finding ways to encourage activity within a community – including building sidewalks, implementing policies that encourage active transportation and building parks and gyms – are all good ways to improve physical fitness.
While the Lancet provides a wide range of data about physical activity across the world, the take-home message is a simple one: It’s important to get moving, no matter what your age. Policy makers at all levels around the world should make it a priority to increase physical activity levels in their communities and countries.
