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Long-term Health Effects Of Low-carbohydrate Diets In Obese Subjects With The Metabolic Syndrome
Funder
National Health and Medical Research Council
Funding Amount
$497,716.00
Summary
The prevalence of obesity and its associated physiological and psychological comorbidities is increasing dramatically in Australia and throughout the developed world. Governing public health bodies recommend lifestyle changes of energy restriction combined with increasing physical activity for the treatment of obesity. In response to the increasing concerns about the rising level of obesity, there has been a multitude of fad diets developed outside the medical and nutritional recommendations for ....The prevalence of obesity and its associated physiological and psychological comorbidities is increasing dramatically in Australia and throughout the developed world. Governing public health bodies recommend lifestyle changes of energy restriction combined with increasing physical activity for the treatment of obesity. In response to the increasing concerns about the rising level of obesity, there has been a multitude of fad diets developed outside the medical and nutritional recommendations for healthy eating and with this an increased popularity of dietary regimens with severe restriction of carbohydrate, such as the Dr. Atkins diet. But although adopted by millions worldwide yearly and the release of a range of low-carbohydrate products into the food market, there is minimal scientific evidence available for the long-term efficacy and safety of low-carbohydrate diets, including their impact on risk factors for cardiovascular disease, diabetes, cancer, kidney function, bone health, psychosocial function and the capacity to undertake concurrent physical activity and daily living activities. Consequently, there is a lack of evidenced-based public health recommendations and policy regarding these dietary practices. In this project we will compare the long-term nutritional adequacy and effects of a very low-carbohydrate, weight loss diet to a conventional high-carbohydrate, low fat weight loss diet on cardiovascular health, exercise tolerance, mood state, bone health, renal function, bowel health and cancer risk in obese people with risk factors for cardiovascular disease in order to develop appropriate public health guidelines to counsel obese patients.Read moreRead less
Is A Higher Intake Of Omega-3 Fatty Acids Advantageous For Weight Loss?
Funder
National Health and Medical Research Council
Funding Amount
$473,219.00
Summary
A 12 month dietary trial will be conducted to investigate whether a diet that is high in polyunsaturated fat (particularly long chain omega-3 fats found in fish oil) improves weight loss and metabolism, compared to a standard low fat weight-reducing diet. Other benefits of the diet, such as improvements in blood pressure, blood lipids and glucose, will be investigated. The findings will be used to refine dietary advice for weight loss and to develop food products enriched with fish oil.
The Role Of Sarcopenia And Undernutrition In Disability After Hip Fracture
Funder
National Health and Medical Research Council
Funding Amount
$315,391.00
Summary
Hip fracture is one of the most costly and devastating medical events which can befall an elderly individual, and is expected to affect 40,000 Australians per year by the year 2040. It often results in permanent loss of walking abilities and independence, as well as a severely diminished quality of life. For example, 80% of elderly Australians who fracture their hip will not regain their previous level of walking ability, 20% will have died, and up to 25% will be in permanent nursing home reside ....Hip fracture is one of the most costly and devastating medical events which can befall an elderly individual, and is expected to affect 40,000 Australians per year by the year 2040. It often results in permanent loss of walking abilities and independence, as well as a severely diminished quality of life. For example, 80% of elderly Australians who fracture their hip will not regain their previous level of walking ability, 20% will have died, and up to 25% will be in permanent nursing home residence 12 months later. Although hip fracture has been thought of as a problem primarily related to osteoporosis (age-related loss of bone), it is now increasingly clear that other factors such as muscle wasting and weakness, gait and balance problems and poor dietary intake are also risk factors for this condition. Although surgical techniques have advanced to the point that most operations to repair hip fracture are now successful, the rehabilitation outcomes are disappointingly poor compared to other orthopaedic injuries. We believe that this is because recovery after hip fracture is in fact not primarily related to the bone disease itself, but to inadequate muscle bulk and strength. It is likely that already frail patients with a new hip fracture will experience further muscle wasting over time, because of their very low levels of physical activity, poor nutritional intake, depression, social isolation, and impaired memory in some cases. Their poor diet may be related in part to their difficulty in getting out of the home, preparing meals, reduced appetite and poor morale in the post-fracture period. If our theory is correct, then we will be able to prove that disability after hip fracture is closely related to muscle mass, and many common clinical problems contribute to this underlying mechanism of dysfunction. We will test these ideas by following patients who have had a hip fracture for 12 months with periodic detailed assessmentsRead moreRead less
Dietary Protein Effects In Elderly Women: Musculoskeletal, Renal, Cardiovascular And Body Composition Endpoints
Funder
National Health and Medical Research Council
Funding Amount
$478,946.00
Summary
Fractures and falls of the elderly are major health problems in our community in terms of disability and cost. It is critical to the future health of our aging population to develop non-pharmaceutical interventions to maintain health into old age. Epidemiologic studies have shown that relatively high protein intake is associated with increased bone mineral mass and reduced incidence of osteoporotic fracture in elderly people. Low protein intakes can lead to loss of muscle mass. To date there hav ....Fractures and falls of the elderly are major health problems in our community in terms of disability and cost. It is critical to the future health of our aging population to develop non-pharmaceutical interventions to maintain health into old age. Epidemiologic studies have shown that relatively high protein intake is associated with increased bone mineral mass and reduced incidence of osteoporotic fracture in elderly people. Low protein intakes can lead to loss of muscle mass. To date there have been no randomised trials of sufficient duration to examine the effects of increased dietary protein intake on bone and muscle health of the elderly. The aim of this study is to examine the effectiveness of protein supplementation for the prevention of osteoporosis and muscle wasting in elderly women, and the safety of such an intervention through monitoring renal function and risk factors for cardiovascular disease. Two hundred and twenty women will be recruited to this study and be assigned to protein group or placebo group. Women in the protein group will received 250 ml high protein drink (containing 30 g protein) per day and women in the placebo group will receive placebo drink containing the same amount of energy, calcium but no additional protein. Bone structure, muscle mass, body composition, renal function and risk factors for cardiovascular disease will be monitored during the 2 year study period. The results of this randomised, controlled study will clarify the role of protein on bone mass and structure, muscle mass and body composition in the elderly. At the same time, the safety of such intervention on renal and cardiovascular endpoints will also be evaluated. It is envisaged that the results of this study if positive will translate into both immediately applicable intervention strategies that are relevant at a program and an individual level.Read moreRead less
Effect Of Prenatal N-3 Long Chain Polyunsaturated Fatty Acids On Body Mass In Early Childhood
Funder
National Health and Medical Research Council
Funding Amount
$1,462,626.00
Summary
In Australia more than 1 in 5 four year-olds are now classified as overweight. There is good evidence that omega-3 fats inhibit the early development of fat cells and thereby reduce the later accumulation of excess body fat. This will be the first human trial to examine whether an increased supply of low cost omega 3 fats in pregnancy can reduce fatness and the likelihood of developing type II diabetes in childhood.
Effect Of Lipid Mediators And Dietary Fats In Bone Remodelling
Funder
National Health and Medical Research Council
Funding Amount
$380,250.00
Summary
Osteoporosis in a major public health problem which directly affects about 10% of the population, which is currently around 2 million Australians. With aging of the population, it is projected that this proportion will increase to more than 13% over the next 20 years. When it is considered that the direct hospital and residential care costs attributable to osteoporotic fractures currently approaches $2 billion per annum, low-cost interventions for increasing bone strength which are easily applie ....Osteoporosis in a major public health problem which directly affects about 10% of the population, which is currently around 2 million Australians. With aging of the population, it is projected that this proportion will increase to more than 13% over the next 20 years. When it is considered that the direct hospital and residential care costs attributable to osteoporotic fractures currently approaches $2 billion per annum, low-cost interventions for increasing bone strength which are easily applied to the elderly population have enormous potential for health benefits in Australia. Thus study will examine the effects of dietary omega-3 fats, of the kind found in fish and fish oil, on the biology of bone metabolism and on bone strength. The results will provide information which may be used in developing simple drug or dietary strategies for large-scale use for increasing bone mass and strength in the elderly population. A strength of the study arises from the combination of research expertise in (a) dietary fats, and (b) molecular biology of bone cells, and (c) animal models of bone metabolism which are amenable to dietary interventions. This combination is unique, but builds on well established systems which hitherto have existed in separate research paradigms. The Chief Investigator has considerable experience in development of diets enriched in omega-3 fats which are practical and suitable for daily use on a long-term basis. This adds considerably to the potential significance of the outcomes because, if favourable effects of omega-3 fats are observed and are characterised with regard to mechanisms, the results can be rapidly translated into large-scale clinical use.Read moreRead less
An Investigation Into The Mechanisms Of How Dietary Fats Influence Alzheimers Disease Risk.
Funder
National Health and Medical Research Council
Funding Amount
$567,789.00
Summary
There is some evidence to suggest that diet may influence the risk for developing Alzheimer's Disease. This project will explore if dietary fats that are 'bad-for-the-heart', are also 'bad-for-the-head'. Conversely, these researchers will test whether heart-healthy-oils are brain-healthy. The researchers will investigate the mechanisms by which dietary fats influence risk and hope to be able to develop nutritional guidelines for the prevention or slowing of Alzheimer's Disease.
Predictors Of Cardiovascular Disease Mortality In The Melbourne Collaborative Cohort Study
Funder
National Health and Medical Research Council
Funding Amount
$350,544.00
Summary
The Melbourne Collaborative Cohort Study was set up in the early 1990s to investigate prospectively the role of diet and other lifestyle factors in causing common chronic diseases including common cancers and cardiovascular disease. Between 1990 and 1994, 41,500 people, aged 40-69 were recruited into the MCCS. About 30% of the cohort are southern European migrants to Australia who were deliberately over-sampled to extend the range of dietary and lifestyle exposures. Migrants from southern Europe ....The Melbourne Collaborative Cohort Study was set up in the early 1990s to investigate prospectively the role of diet and other lifestyle factors in causing common chronic diseases including common cancers and cardiovascular disease. Between 1990 and 1994, 41,500 people, aged 40-69 were recruited into the MCCS. About 30% of the cohort are southern European migrants to Australia who were deliberately over-sampled to extend the range of dietary and lifestyle exposures. Migrants from southern Europe have an adverse risk factor profile in relation to obesity, body fat distribution, physical activity patterns, diabetes, smoking, blood pressure and cholesterol levels, yet their death rates from heart disease are 30-40% lower than the Australian average. A major objective of this study is to investigate the possibility that particular aspects of the diet and cuisine of migrants from southern Europe (olive oil as the major dietary fat, and high intakes of a variety of vegetables and fruit) protect against heart disease and stroke by providing high levels of a wide range of natural antioxidants. It represents the most comprehensive prospective study of diet and cardiovascular disease mortality ever conducted in Australia. A particularly powerful feature is the combination of detailed self-reported dietary intake, the very wide range of exposures to dietary factors implicated in CVD (as risk factors or protective agents), and the objective markers of dietary intake (biochemical markers of dietary intake patterns in blood collected at recruitment, body weight, body fat and body fat distribution). The data should provide a strong rationale for specific dietary recommendations as part of population-based strategies to reduce the incidence of premature mortality from heart disease and stroke in the Australian population.Read moreRead less