SATURATED FAT ‘FACTS’ QUESTIONED IN NEW UNIVERSITY OF CAMBRIDGE DIABETES STUDY

SATURATED FAT ‘FACTS’ QUESTIONED IN NEW UNIVERSITY OF CAMBRIDGE DIABETES STUDY

From the FMS Global News Desk of Jeanne Hambleton Posted on August 5, 2014                         From Stone Hearth News – University of Cambridge

The relationship between saturated fat and type 2 diabetes may be more complex than previously thought, according to the results of a large international study published today in the journal Lancet Diabetes and Endocrinology. The study found that saturated fatty acids can be associated with both an increased and decreased risk of developing the disease, depending on the type of fatty acids present in the blood.

The results add to the growing debate around the health consequences of fat, and could partially explain evidence from recent studies that suggests some foods high in saturated fats, such as dairy products, could actually lower the risk of type 2 diabetes.

Saturated fat is typically found in foods with a high proportion of animal fat, such as butter, cheese and red meat, and in fried foods. It is made up of chains of individual fat molecules (fatty acids) that vary in length, depending on how many carbon atoms they contain. These saturated fatty acids have long been considered detrimental to health, and current recommendations suggest they should make up no more than 10 per cent of the calories we eat. However, the role of saturated fat in type 2 diabetes risk is unclear.

In the EPIC-InterAct Study, which was funded mainly by the European Commission under its Framework 6 programme, a team of researchers led by the Medical Research Council (MRC) Epidemiology Unit at the University of Cambridge set out to examine the relationship between blood levels of nine different saturated fatty acids and the risk of developing type 2 diabetes in later life.

The researchers looked at 12,403 people who developed type 2 diabetes from among a group of 340,234 adults across eight European countries. Using a sophisticated method of high-speed blood analysis, developed especially for the project by researchers at MRC Human Nutrition Research, they determined the proportion of each of the nine fatty acids in blood samples from the study participants and related this with later incidence of type 2 diabetes.

They found that saturated fatty acids with an even number of carbon atoms in their chain (14, 16 and 18 carbon atoms) were associated with a higher risk of type 2 diabetes, while saturated fatty acids with an odd number (15 and 17) were associated with a lower risk.

Lead scientist Dr Nita Forouhi, from the MRC Epidemiology Unit at the University of Cambridge, said: “Our findings provide strong evidence that individual saturated fatty acids are not all the same. The challenge we face now is to work out how the levels of these fatty acids in our blood correspond to the different foods we eat.

“These odd-chain saturated fatty acids are well-established markers of eating dairy fats, which is consistent with several recent studies, including our own, that have indicated a protective effect against type 2 diabetes from eating yoghurt and other dairy products. In contrast, the situation for even-chain saturated fatty acids is more complex. As well as being consumed in fatty diets, these blood fatty acids can also be made within the body through a process which is stimulated by the intake of carbohydrates and alcohol.”

The authors therefore conclude that it is too early to make any direct dietary recommendations on the basis of this work.

Professor David Lomas, Chair of the MRC’s Population and Systems Medicine Board, added: “Type 2 diabetes has serious consequences for health and healthcare costs, and its numbers are rising in all world regions. Identifying new ways to not only treat, but prevent the condition are therefore vital. This research arising from 26 research institutions across Europe is an example of the power of international collaboration to generate larger and more reliable studies. By combining large-scale population data with advanced laboratory analysis, this research has delivered a compelling case to look more closely at the contribution of individual components of fat to health and disease.”

Our findings provide strong evidence that individual saturated fatty acids are not all the same said Nita Forouhi .

 

UNHEALTHY DIET AND PHYSICAL INACTIVITY: UNDERSTANDING THESE SILENT KILLERS

From the FMS Global News Desk of Jeanne Hambleton               University of Cambridge Licensed under a Creative Commons Licence

 

Population-based interventions for tackling unhealthy diet and physical inactivity could save millions of lives. An ambitious research programme is providing evidence for how best to deliver the goal.

“It might be that the biggest influences on the population’s diet and activity would not just come from simply urging people to change. Instead, major whole-scale restructuring of the way society operates might be necessary,” said Professor Nick Wareham

Living a healthy lifestyle might seem like common sense, but the environment we live in can make healthy choices more difficult. Whether it is how much access we have to green spaces, the transport we take to work, or our diet, each can have an impact on leading a long and healthy life.

Diet and activity behaviours, together with alcohol and tobacco, are risk factors for the world’s fastest growing health epidemic: a group of ‘silent killers’ that often develop slowly over many years and are known as the non-communicable diseases (NCDs).

NCDs, so-called because they are not transmitted person to person, include diabetes, cardiovascular disease, chronic respiratory disease, cancer and mental health disorders, and are by far the leading global cause of death. Of 57 million deaths recorded worldwide in 2008, NCDs were responsible for 36 million, 80% of which were in low- and middle-income countries. By 2030, the total number of NCD-related deaths could rise to 52 million and result in a cumulative loss in global economic output of $47 trillion.

The statistics are deeply shocking. But, as Professor Nick Wareham, Director of both the Medical Research Council (MRC) Epidemiology Unit and Cambridge’s Centre for Diet and Activity Research (CEDAR), explained there are potential solutions: “Behaviour is a key risk factor for NCDs, often closely connected with biological, environmental and social factors. With a more supportive environment and the right incentives, individuals might be more able to change their behaviour to look after their own health: taking exercise, eating a healthy diet, not smoking and limiting alcohol consumption.”

“As well as ensuring that high-risk individuals get the right support, we need effective strategies for targeting whole populations,” he added.  “The challenge is to discover what determines the population distribution of health-related behaviours so that we can understand how those distributions can be shifted.”

Research in a changing world

CEDAR is intent on building the evidence base on which to move populations in the right direction. Hosted by the Cambridge Institute of Public Health, the Centre is a partnership between the Universities of Cambridge and East Anglia, and the MRC Epidemiology Unit, the MRC Biostatistics Unit and the MRC Human Nutrition Research Unit. Created in 2008, it is one of five UK Public Health Research Centres of Excellence funded with a total of £20 million over five years by the UK Clinical Research Collaboration.

One of the efficiencies of the CEDAR approach is that it enables new studies to be overlaid on the foundations of some remarkably long-running, large-scale epidemiological studies carried out by the University and embedded MRC Units. The European Prospective Investigation of Cancer (EPIC)-Norfolk study, for instance, has been studying  25,000 individuals for almost 20 years to understand not only the connection between diet and cancer but also the factors that are most often present when people stay healthy throughout life. “Many of these factors might be obvious but you actually have to demonstrate their benefit or their risk so that interventions are based on empirical data,” explained Wareham.

Measuring the determinants of behaviour and evaluating interventions lie at the heart of the portfolio of projects at CEDAR. One study, SPEEDY, has been focusing on the factors that determine diet and physical activity in childhood and adolescence, a period that shapes behaviours that can last a lifetime. Among the findings of the project, which is funded by the National Prevention Research Initiative (NPRI), is the importance of the ‘physical activity friendliness’ of the school environment. One, perhaps counter-intuitive, finding is that allowing children to play outside in wet weather during school break times is associated with lower activity levels than keeping them indoors and providing opportunities for physical activity. This has implications for school policies on indoor play and the design of school grounds for wet weather.

Through systematic reviews of the evidence and a new randomised trial, CEDAR and the MRC Epidemiology Unit is also learning about how we can prevent childhood obesity by intervening during infancy. UK surveys have shown that more than one in five children are overweight or obese by the time they start school. “Little research has looked at how best to protect the health of bottle-fed babies, who gain weight rapidly and tend to be at higher risk of childhood obesity,” said Wareham. It turns out that many mothers lack information about how best to bottle-feed their babies and mistakes in feed preparation are common. CEDAR has developed a behavioural intervention aimed at parental feeding which is undergoing evaluation in a randomised controlled trial funded by the NPRI.

Some aspects of behaviour are shaped by the environment, including the layout of the buildings we work in or the infrastructure that determines how we travel to work. CEDAR researchers are interested in so-called natural experimental studies, which examine the effects of changes in the environment and policy on physical activity. The Commuting and Health in Cambridge study, funded by the National Institute for Health Research, is assessing whether the provision of new transport infrastructure such as the Cambridgeshire Guided Busway has any effect on travel behaviour and physical activity in the commuting population. The Busway only opened in summer 2011 but results gathered during the ‘before’ period are already providing insight into the factors that influence people’s travel behaviour.

“It might be that the biggest influences on the population’s diet and activity won’t just come from simply urging people to change,” explained Wareham. “Instead, major whole-scale restructuring of the way society operates might be necessary – from increasing access to green spaces, changing schools’ food policies to rethinking the physical structure of road networks.”

Capacity, research, translation

Building research capacity is a key aim of CEDAR, and currently 35 researchers with expertise in biostatistics, epidemiology, behavioural science, health economics, health geography and public health nutrition contribute to the work of the Centre. Another aim is to make evidence available in a form that is most usable to policy makers, through physical products such as evidence briefs and evaluation toolkits, and through developing relationships in policy and practice arenas.

Helping to facilitate the translation of research to policy, CEDAR works closely with the Eastern Region Public Health Observatory, which provides information, data and intelligence on people’s health and health care for practitioners, policy makers and the wider community.

Some CEDAR investigators also work as part of the newly formed Behaviour and Health Research Unit (BHRU), which is funded by the Department of Health Policy Research Programme to contribute evidence on effective ways of changing behaviour in populations to improve health and reduce health inequalities.

Policy makers are currently showing great interest in ‘nudge’ approaches – altering environments to prompt healthier behaviour, without banning particular choices – and last year the BRHU questioned whether such an approach stands up to scientific scrutiny.

We know from past examples that firmer legislative approaches can reap dramatic health rewards: when Scotland first imposed a ban on smoking in public places in 2006, a 17% reduction in admissions for heart attacks was recorded within a year across nine Scottish hospitals. But questions remain about which interventions are the most cost-effective and worthwhile – the so-called ‘best buys’.

“The increasing number of people with NCDs is a vast public health and economic problem. Although it is widely accepted that something needs to be done, there is uncertainty about how this epidemic can be stemmed,” said Wareham.

“At the moment, the sound base of research underpinning solutions is largely lacking. There may be some policies that could be put in place now but we believe that interventions should be better evaluated. Going forwards, the scale of the task we face globally is huge. CEDAR has already made a good start.”

This work is licensed under a Creative Commons Licence. If you use this content on your site please link back to this page.

 

EXERCISE INTEREST DECLINES WITH AGE –NEW STUDY FROM CANADA

From the FMS Global News Desk of Jeanne Hambleton Posted on August 5, 2014                          By Stone Hearth News –  Eureka Alert

 

Montreal, August 5, 2014 — As the first generation to embrace exercise, baby boomers continue going to the gym, yet more out of necessity than for the challenge and enjoyment of physical activity.

In a study recently published in the International Journal of Wellbeing, James Gavin, a professor in Concordia’s Department of Applied Human Sciences, investigates our motivations for exercise, from looking good to having fun. He finds that for the baby boom generation, passion is the most important motivator — a fact the fitness industry should embrace.

He says that once we connect with our passion, motivation can flow backward to sustain participation in cross-training activities: for instance a person will be keener to put in time on the treadmill if she knows it will help her have more fun skiing in winter.

Gavin’s study surveyed 1,885 participants at YMCA facilities across Montreal and examined responses by age-group — breaking answers down by decade, from the teens to 50 and over. Of four major motivation categories, “toned and fit” was the top motivator in all age groups, followed by “stress reduction.”

Yet perhaps more unexpectedly for a generation who came of age in the era when exercise became a way of life, the two final categories, “mental toughness” (defined as embracing activity for its adventure and challenge) and “fun and friends” (social motivations), both declined with increasing age.

Gavin says he is surprised by the findings, but less so when he surveys the scene at his local gym. “Exercise is often perceived as a necessary evil. When I go to a gym and look around, I do not see a lot of excitement or laughter — people are putting in their time almost as prisoners on their solitary workout stations. They are working away, and relieved when it is over.”

Although gratified by the effects on their health, many who are dedicated to fitness do not experience much joy in pursuing active lifestyles, which Gavin says is cause for concern because eventually this lack of deep motivation may cause boomers to stop making the effort.

“What stunned me was when we think of boomers — healthy ambulatory individuals who are reasonably robust and who theoretically have more time on their hands — one might imagine they would want to continue having fun and experiencing personal challenge and growth in what they are doing,” says Gavin. As a contrast, he points to the excitement and spontaneity that young children display in their physical activities.

Gavin says the results of his study propose a challenge for the fitness industry to move away from machine-dominated options toward personally meaningful and socially connected pursuits. He points to activities where passion happens in the sport itself and physical benefits are wonderful secondary outcomes. Team sports and martial arts are clear examples — even though many older adults mistakenly see themselves as “too old” for these activities.

“The marketing needs to be about passion, around finding deep personal meaning in physical activity,” says Gavin. “If you watch people playing tennis or slaloming down a hill, they are not counting calories.”

See you tomorrow. Jeanne

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