A new study claims that having sugary drinks every day could put people at a greater risk of developing Type 2 diabetes and heart disease.

American researchers found that the excessive consumption of sugary drinks, which can contain up to 200 calories each, contributed to 130,000 cases of Type 2 diabetes and 14,000 cases of heart disease between 1990 and 2000 in the USA.

The researchers also concluded that sugary drinks are fuelling the obesity epidemic. The findings of the research were presented at the American Heart Association Annual Conference on Cardiovascular Disease Epidemiology and Prevention.

Increased risk

“This study adds to the wealth of research around the health risks associated with long-term consumption of high calorie, high sugar drinks,” said Florence Brown, Care Advisor at Diabetes UK. “These drinks can lead to easy weight gain which can increase the risk of developing Type 2 diabetes, a serious life-long condition that can lead to complications such as blindness, heart disease and amputation.

“Sugary drinks should be avoided wherever possible and cutting them out is an easy, instant way to improve your health. As well as cutting out sugary drinks, you can reduce your risk of developing Type 2 diabetes by combining regular physical activity with a healthy balanced diet rich in fruit and vegetables and low in fat, sugar and salt.”

Another weapon in the arsenal against cancer: Nanoparticles that identify, target and kill specific cancer cells while leaving healthy cells alone.

Led by Carl Batt, the Liberty Hyde Bailey Professor of Food Science, the researchers synthesized nanoparticles shaped something like a dumbbell made of gold sandwiched between two pieces of iron oxide. They then attached antibodies, which target a molecule found only in colorectal cancer cells, to the particles. Once bound, the nanoparticles are engulfed by the cancer cells.

To kill the cells, the researchers use a near-infrared laser, which is a wavelength that doesn’t harm normal tissue at the levels used, but the radiation is absorbed by the gold in the nanoparticles. This causes the cancer cells to heat up and die.

“This is a so-called ’smart’ therapy,” Batt said. “To be a smart therapy, it should be targeted, and it should have some ability to be activated only when it’s there and then kills just the cancer cells.”

The goal, said lead author and biomedical graduate student Dickson Kirui, is to improve the technology and make it suitable for testing in a human clinical trial. The researchers are now working on a similar experiment targeting prostate cancer cells.

“If, down the line, you could clinically just target the cancer cells, you could then spare the health surrounding cells from being harmed that is the critical thing,” Kirui said.

Gold has potential as a material key to fighting cancer in future smart therapies. It is biocompatible, inert and relatively easy to tweak chemically. By changing the size and shape of the gold particle, Kirui and colleagues can tune them to respond to different wavelengths of energy.

Once taken up by the researchers’ gold particles, the cancer cells are destroyed by heat just a few degrees above normal body temperature while the surrounding tissue is left unharmed. Such a low-power laser does not have any effect on surrounding cells because that particular wavelength does not heat up cells if they are not loaded up with nanoparticles, the researchers explained.

Using iron oxide which is basically rust as the other parts of the particles might one day allow scientists to also track the progress of cancer treatments using magnetic resonance imaging, Kirui said, by taking advantage of the particles’ magnetic properties.

Nicotine takes much longer than previously thought to reach peak levels in the brains of cigarette smokers, according to new research conducted at Duke University Medical Center.

Traditionally, scientists thought nicotine inhaled in a puff of cigarette smoke took a mere seven seconds to be taken up by the brain, and that each puff produced a spike of nicotine. Using PET imaging, Duke investigators illustrate, for the first time, that cigarette smokers actually experience a steady rise of brain nicotine levels during the course of smoking a whole cigarette.

The findings, scheduled to appear online in the Early Edition of Proceedings of the National Academy of Sciences (PNAS) the week of March 8, could lead to more effective treatments for smoking addiction.

“Previously it was thought that the puff-by-puff spikes of nicotine reaching the brain explained why cigarettes are so much more addictive than other forms of nicotine delivery, like the patch or gum,” says Jed Rose, Ph.D., director of the Duke Center for Nicotine and Smoking Cessation Research. “Our work now calls into question whether addiction has to do with the puff-by-puff delivery of nicotine. It may actually depend in part on the overall rate at which nicotine reaches and accumulates in the brain, as well as the unique habit and sensory cues associated with smoking.”

Yet, when the researchers compared 13 dependent smokers to 10 non-dependent smokers, they were surprised to find the dependent smokers had a slower rate of nicotine accumulation in the brain. “This slower rate resulted from nicotine staying longer in the lungs of dependent smokers, which may be a result of the chronic effects of smoke on the lungs,” surmises Rose.

The difference in rate of nicotine accumulation in the brain doesn’t explain why some people become addicted to cigarettes and others don’t. “Even if you correct for the speed of delivery, our study showed the non-dependent smokers eventually experienced the same high levels of nicotine in their brain as dependent smokers, yet they did so without becoming dependent. The real mystery is why.”

Rose says the absence of addiction in these smokers could be due to genetic differences, differences in the way they smoke, or differences in the psychological effects they derive. “We’re still not able to fully explain why these people are able to smoke without becoming addicted.”

Despite the questions raised, the study provides important insights into the role of the speed and level of brain nicotine levels, and which receptors in the brain are at work. “Different receptors respond to nicotine at different levels of sensitivity,” says Rose. “Knowing the levels of nicotine that are really getting to the brain gives us clues as to which receptors are more likely to be important for the dependence-producing effects of cigarette smoking.”

Immune cells use a bungee-like nanotube to snare dangerous cells, according to new research funded by the Medical Research Council (MRC).

The findings by researchers from Imperial College London show that natural killer (NK) cells use this bungee, called a membrane nanotube, to destroy cells that could otherwise escape them.

NK cells are the first line of defence against dangerous cells, such as tumour cells and cells infected with bacteria and viruses, and researchers are keen to understand how they help the body fight infection and stop tumours from growing. Ultimately, it may be possible to design drugs that harness the NK cells’ ability to fight disease.

Prior to this study, scientists understood that NK cells can kill their target cells by attaching onto them, forming a connection called an immune synapse, which they use to pass toxic molecules into the target cell. However, sometimes the target cells move away from the NK cells to escape being destroyed.

The researchers took video footage of the cells using the bungee-like tube to keep hold of their target cells. The NK cells either pulled the target cells back into direct contact to be killed, or killed them from a distance.

Dr Kevin Moreton, Board Programme Manager for Infections and Immunity at the Medical Research Council said: “Understanding how the human immune system protects the body is critical to developing new treatments for a range of conditions from infectious diseases, autoimmune diseases, through to allergies. The MRC funded this study as part of our core strategy and ongoing commitment to researching the body’s natural protection and defence mechanisms.”

Professor Daniel Davis, corresponding author of the study at Imperial College London said: “Natural Killer cells are cells that are really good at killing tumours and virus-infected cells. It was thought they kill these diseased cells only by sticking to them tightly for several minutes. These new movies show that in fact they also tether cells with long membrane connections and can pull diseased cells back into contact. We think they may also use these nanotubes to kill them from a distance.

“The movies show the process vividly but the next step is difficult because we have to know where and when these processes are important in your body, and the technology to see such thin nanotubes in the body hasn’t been invented yet! It’s a very new research area and we need to learn how the process works precisely so that we can then think about ways to design drugs that help immune cells kill,” added Professor Davis.

When a target cell moves away from an NK cell, it normally moves ‘head’ first, at around eight micrometres per minute. Today’s research shows that when the NK cell pulls its target cell back using the nanotube bungee, it moves much faster, at around fourteen micrometres per minute. The study also showed that membrane nanotubes dramatically increase an NK cell’s chance of killing its target cell from a distance. The next step will be to find out exactly how the bungee tubes help immune cells kill their target cells.

There’s no doubt that meeting partners on the Internet is a growing trend. But can we trust the information that people provide about themselves via online dating services? And why is depression so dissatisfying in relationships? These two questions are explored in articles appearing in the latest issue of the Journal of Social and Personal Relationships, published by SAGE. The authors also discuss their findings in a new podcast series: Relationship Matters.

Jeffrey Hall of the University of Kansas is lead author of the paper on internet dating, which shows that people looking for romance online actually behave very much as they do in face to face dating and relationships. “Our findings dispel the myth that people using online dating are that different than any one else who might find a relationship through friends, school or work,” Hall explains.

His team investigated over 5000 individuals dating online in search of long-term partners, from all walks of life and over a wide age range (18 to over 60). The survey included questions on personality traits such as openness, extroversion, education and income. “We also asked a series of questions on an important trait that we call self monitoring,” Hall says. “Self monitoring is about how we try to present ourselves in a favourable light to others, to make people like us.” Someone who scores as ‘low’ on self monitoring is extremely authentic when describing themselves in all circumstances, and those who score ‘high’ are more prone to so-called white lies.

Self-monitoring scores turned out to be a major factor in the likelihood of people changing their presentation to others across all dating indicators (topics such as previous relationships, likes, dislikes, appearance, etc).

Whether a person is likely to lie about themselves online also depends on what kind of person they are: Someone who is very open to new experiences (e.g. foreign travel) is highly unlikely to misrepresent themselves about their experiences – because they are naturally interesting people. On the other hand extroverts are more likely to misrepresent themselves when describing past relationships. Extroverts tend to have many past relationships because they meet new people easily, but may play this down when looking for a new relationship.

The good news, according to Hall, is that the likelihood of people misrepresenting themselves overall is actually very low. The research also showed that not all men are from Mars and Women from Venus – the differences between individuals was far greater than any difference between the sexes. However women were somewhat more likely to fib about their weight, whereas men were more prone to tell white lies on other subjects, such as how many previous partners they had had, or how serious they were about finding a long-term relationship. “Men and women aren’t as different from one another as we might believe,” Hall says. Next up – Hall and his team are developing an inventory of flirting styles, which they aim to publish later this year.

Meanwhile twin sisters Leanne Knobloch of the University of Illinois, US and Lynne Knobloch-Fedders from The Family Institute at Northwestern University, US put their heads together to look at a longstanding question about what explains the association between depressive symptoms and relationship quality.

Over three decades of research have shown that people with depression are less satisfied in their romantic relationships. But questions remain about exactly why these go together. Now the sisters’ research shows that relational uncertainty could be one explanation.

Relational uncertainty is how sure individuals are about their perceptions of involvement in a relationship. It has three sources. Self uncertainty is the questions people have about their own relationship involvement, such as, “how certain am I about my view of this relationship?” Partner uncertainty involves questions about a partner’s relationship involvement, such as, “how certain am I about where my partner wants this to go?” Finally relationship uncertainty involves questions about the relationship status, such as “How certain am I about the future of this relationship?”

There were three main findings from the study of couples experiencing depressive symptoms or relationship problems: Those with more severe depressive symptoms reported more relationship distress; people experiencing more relational uncertainty were less satisfied with their relationship; and finally, women’s depressive symptoms predicted all three sources of their relational uncertainty, which in turn predicted both men’s and women’s relationship quality. For men, only the self source of relational uncertainty acted as a mediator.

This finding could suggest treatment options. For example, working through relational uncertainty issues in psychotherapy may help alleviate depressive symptoms. Alternatively treating depression might help individuals achieve more relational certainty, leading to more satisfying relationships.

“People suffering from depressive symptoms may wrestle with more questions about their romantic relationship, which may be dissatisfying,” says Knobloch. “If we find ways to help people address their uncertainty about their relationship, then their depressive symptoms might not be so debilitating for their romantic relationships.”

Some anti-depressant drugs are associated with an increased chance of developing cataracts, according to a new statistical study by researchers at the University of British Columbia, Vancouver Coastal Health Research Institute and McGill University.

The study, based on a database of more than 200,000 Quebec residents aged 65 and older, showed statistical relationships between a diagnosis of cataracts or cataract surgery and the class of drugs called selective serotonin reuptake inhibitors (SSRIs), as well as between cataracts and specific drugs within that class.

Published online in the journal Ophthalmology, the study does not prove causation but only reveals an association between the use of SSRIs and the development of cataracts. The study could not account for the possibility of smoking – which is a risk factor for cataracts – and additional population-based studies are needed to confirm these findings, the researchers say.

This study of statistical relationships is the first to establish a link between this class of drugs and cataracts in humans. Previous studies in animal models had demonstrated that SSRIs could increase the likelihood of developing the condition.

“When you look at the trade-offs of these drugs, the benefits of treating depression – which can be life-threatening – still outweigh the risk of developing cataracts, which are treatable and relatively benign,” says Dr. Mahyar Etminan, lead author of the article, a scientist and clinical pharmacist at the Centre for Clinical Epidemiology at Vancouver Coastal Health Research Institute and an assistant professor in the Dept. of Medicine at UBC.

Researchers found patients taking SSRIs were overall 15 per cent more likely to be diagnosed with cataracts or to have cataract surgery.

The degree of risk among specific and different types of SSRIs varied considerably. Taking fluvoxamine (Luvox) led to a 51 per cent higher chance of having cataract surgery, and venlafaxine (Effexor) carried a 34 per cent higher risk. No connection could be made between fluoxetine (Prozac), citalopram (Celexa), and sertraline (Zoloft) and having cataract surgery.

Co-author Dr. Frederick S. Mikelberg, professor and head of the Dept. of Ophthalmology and Visual Sciences at UBC and head of the Dept. of Ophthalmology at Vancouver General Hospital, notes that the average time to develop cataracts while taking SSRIs was almost two years.

“While these results are surprising, and might inform the choices of psychiatrists when prescribing SSRIs for their patients, they should not be cause for alarm among people taking these medications,” Mikelberg says.

A new method of growing arteries could lead to a “biological bypass” – or a non-invasive way to treat coronary artery disease, Yale School of Medicine researchers report with their colleagues in the April issue of Journal of Clinical Investigation.

Coronary arteries can become blocked with plaque, leading to a decrease in the supply of blood and oxygen to the heart. Over time this blockage can lead to debilitating chest pain or heart attack. Severe blockages in multiple major vessels may require coronary artery bypass graft surgery, a major invasive surgery.

“Successfully growing new arteries could provide a biological option for patients facing bypass surgery,” said lead author of the study Michael Simons, M.D., chief of the Section of Cardiology at Yale School of Medicine.

In the past, researchers used growth factors – proteins that stimulate the growth of cells – to grow new arteries, but this method was unsuccessful. Simons and his team studied mice and zebrafish to see if they could simulate arterial formation by switching on and off two signaling pathways – ERK1/2 and P13K.

“We found that there is a cross-talk between the two signaling pathways. One half of the signaling pathway inhibits the other. When we inhibit this mechanism, we are able to grow arteries,” said Simons. “Instead of using growth factors, we stopped the inhibitor mechanism by using a drug that targets a particular enzyme called P13-kinase inhibitor.”

“Because we’ve located this inhibitory pathway, it opens the possibility of developing a new class of medication to grow new arteries,” Simons added. “The next step is to test this finding in a human clinical trial.”

A new study from the US found that normal weight women in their 40s and older who drank a light to moderate amount of alcohol gained less weight and had a lower risk of becoming obese and overweight compared to their non-drinking counterparts.

The researchers, from the Brigham and Women’s Hospital, and the Harvard School of Public Health in Boston, Massachusetts, have written about their study in a paper published online in the 8 March issue of Archives of Internal Medicine.

At 7 calories per gram (equivalent to 199 calories per ounce), alcohol is potentially a significant source of dietary calories, and more than half of adult Americans are alcohol drinkers. Meanwhile obesity is approaching epidemic proportions in the US, yet evidence on the extent to which alcohol consumption contributes to this public health crisis is patchy, suggested the authors.

For their prospective cohort study, which was sponsored by grants from the National Institutes of Health, lead author Dr Lu Wang, of Brigham and Women’s Hospital, and colleagues examined data from 19,220 women living in the US who were aged 39 and over, had no traces of cardiovascular disease, cancer, or diabetes, and whose body mass index (BMI) was in the range classified as normal (18.5 to less than 25). BMI is calculated as weight in kilograms divided by height in meters squared.

At the start of the study the women filled in a questionnaire that asked them about their daily alcohol consumption. After that they filled in questionnaires about their weight every year for an average of 13 years.

The results showed that:

* At the start of the study, 38.2 per cent reported drinking no alcohol, 32.8 per cent reported drinking less than 5 grams a day, 20.1 per cent reported drinking 5 to less than 15 grams, 5.9 per cent reported drinking 15 to less than 30 grams, and 3 per cent reported drinking 30 or more grams of alcohol a day.

* Over the 13 years of follow up, the women’s average weight went up steadily.

* 41.3 per cent of the women became overweight (BMI of 25 or more), and 3.8 per cent became obese (BMI of 30 or more).

* After adjusting for potential confounders like baseline BMI, smoking, other calorie sources, exercise, and other lifestyle and dietary factors, there was an inverse association between the amount of daily alcohol the women said they drank in their initial questionnaires and the weight gained over the follow up.

* Compared with women who did not drink at all, those who consumed some but less than 40 grams of alcohol a day had a lower risk of becoming overweight or obese.

* Women who drank 15 to less than 30 grams of alcohol per day had the lowest risk, which was nearly 30 percent lower than that of their non-drinking counterparts.

The authors also looked at four types of alcoholic beverages and found the links to be the same for all, with perhaps the strongest being for red wine.

They concluded that:

“Compared with nondrinkers, initially normal-weight women who consumed a light to moderate amount of alcohol gained less weight and had a lower risk of becoming overweight and/or obese during 12.9 years of follow-up.”

However, the authors stressed that given the potential medical and psychosocial problems of alcohol consumption, recommendations about its use should be made on an individual by individual basis.

They also suggested more studies are needed to find out the biological mechanisms of the role played by alcohol in energy metabolism, and whether any physiological and genetic factors are involved.

“Alcohol Consumption, Weight Gain, and Risk of Becoming Overweight in Middle-aged and Older Women.”

University of Michigan scientists have identified a new reservoir for hidden HIV-infected cells that can serve as a factory for new infections. The findings, which appear online March 7 in Nature Medicine, indicate a new target for curing the disease so those infected with the virus may someday no longer rely on AIDS drugs for a lifetime.

“Antiviral drugs have been effective at keeping the virus at bay. However once the drug therapy is stopped, the virus comes back,” says senior author of the study Kathleen L. Collins, M.D., Ph.D., associate professor of both internal medicine and microbiology and immunology at the U-M Medical School.

In people infected with HIV (human immunodeficiency virus), the virus that causes AIDS, there’s an unsolved problem with current anti-viral drugs. Though life-saving, they cannot root the virus out of the body. Infected cells are able to live on, undetected by the immune system, and provide the machinery for the virus to reproduce and spread.

Important new research by U-M has discovered that bone marrow, previously thought to be resistant to the virus, can contain latent forms of the infection.

“This finding is important because it helps explain why it’s hard to cure the disease,” Collins says. “Ultimately to cure this disease, we’re going to have to develop specific strategies aimed at targeting these latently infected cells.”

“Currently people have to take anti-viral drugs for their entire life to control the infection,” she says. “It would be easier to treat this disease in countries that don’t have the same resources as we do with a course of therapy for a few months, or even years. But based on what we know now people have to stay on drugs for their entire life.”

Using tissue samples, U-M researchers detected HIV genomes in bone marrow isolated from people effectively treated with antiviral drugs for more than six months.

While further studies are needed to demonstrate that stem cells can harbor the HIV virus, the study results confirm that HIV targets some long-lived progenitor cells, young cells that have not fully developed but mature into cells with special immune functions. When active infection occurs the toxic effects of the virus kill the cell even as the newly made viral particles spread the infection to new target cells.

“Our finding that HIV infects these cells has clear ramifications for HIV disease because some of these cells may be long-lived and could carry latent HIV for extended periods of time,” she says. “These HIV cell reservoirs can be induced to generate new infections.”

The new research gives a broader view of how HIV overwhelms the body’s immune system and devastates its ability to regenerate itself.

Globally more than 30 million people are infected with HIV, including millions of children. Improvements have been made since the 1990s in the way the disease is treated that has led to an 85 percent to 90 percent reduction in mortality.

“Drugs now available are effective at treating the virus, making HIV more of a chronic disease than a death sentence,” Collins says. “This has made a huge impact in quality of life, however only 40 percent of people worldwide are receiving anti-viral drugs and unfortunately that means that not everybody is benefiting.”

Researchers at UC Irvine and the Charles Drew University of Medicine & Science (CDU) will monitor the day-to-day health of low-birth-weight babies and their parents as part of a comprehensive initiative designed to combat chronic illnesses associated with low-weight births.

Gillian Hayes, UCI informatics professor, and Karen Cheng, CDU psychiatry & human behavior professor, were awarded a $480,000 grant from the Robert Wood Johnson Foundation (RWJF) to explore how recorded observations of daily living (ODLs) can be used to improve clinical care for low-weight babies.

Hayes and Cheng were among five research teams in the nation selected by RWJF through its Project HealthDesign: Rethinking the Power and Potential of Personal Health Records national program to receive two-year grants that will test how health information technology can help people become more informed patients and better healthcare consumers. The grantees will work with patients to explore how day-to-day information – such as stress levels of caregivers of premature infants and medication-taking routines of seniors at risk of cognitive decline – can be collected, interpreted and acted upon by patients as well as clinicians in real-world clinical settings.

For their project, Hayes and Cheng will use mobile technology to collect and report ODLs that can enable changes in clinical practices and alert healthcare providers earlier to potential problems. The team will develop a mobile application for parents of preterm infants, called FitBaby, which builds on Hayes’ past work with Dr. Dan Cooper, a UCI professor of pediatrics. The system enables parents to easily record ODLs on smartphones, including feeding times, weight measurements, baby’s activity and how parents deal with the stress of caring for an at-risk infant. The system also automatically tracks some observations through sensors in the environment.

“This work is particularly innovative in that we make it convenient for parents to record daily information about their babies by automatically sensing a number of important indicators,” Hayes said. “Pediatricians will have access to the information to make earlier diagnoses, which can improve the health outcomes of babies and caregivers.”

“Parent well-being is often ignored in infant care,” Cheng said. “By helping parents monitor and understand the patterns of their own emotional and physical well-being, we believe that parents will be encouraged to take better care for themselves, leading to better quality of care for the babies.”

Earlier Project HealthDesign work revealed that the data needed to inform day-to-day health decisions came less often from information contained in official medical records and more from information gained by monitoring health in everyday life. The new projects will build on that work.

“We know patients want better relationships with their clinicians and to make the most of their time during a doctor’s visit. Through Project HealthDesign, the patients and the clinicians will be working together to collect and interpret insights from the patient’s everyday life. This process will help empower people to be more informed patients and allow clinicians to determine if their care plan is working,” said Stephen Downs, S.M., assistant vice president for RWJF’s Health Group.

Since its launch in 2006, RWJF has committed $9.5 million in grants and technical assistance to the program, led by a team of experts working in health information technology and patient-centered care at the University of Wisconsin-Madison. Project HealthDesign is supported by RWJF’s Pioneer Portfolio, which funds innovative ideas and projects that can lead to significant breakthroughs in the future of health and health care.

In addition, the program provides legal and regulatory compliance support to grantees and contributes to the public discourse on the legal and regulatory aspects of capturing ODLs and integrating them into care processes. The program will develop resources around the cross-cutting issues regarding use and safe integrations of ODLs as well as specifically advise grantee teams on applicable law and regulations that may alter the consequences of data-sharing between patients and clinicians.

Hayes’ research interests are in human-computer interaction and ubiquitous computing. She studies record-keeping technologies, particularly in natural settings, such as the home. She also focuses on the application and uses of ubiquitous computing and collaborative technologies in the areas of education and healthcare.

Cheng is a social psychologist whose research focuses on the issues affecting use of computer technology in healthcare settings. Her work evaluates the efficacy of electronic versus paper-based data collection, and the acceptance of mobile health technologies among underserved populations, locally and in developing countries.