insulin resistance
Scientists in Sydney and Melbourne have produced results that could silence the current debate about exactly how fat molecules clog up muscle cells, making them less responsive to insulin.
People on low-carbohydrate diets are more dependent on the oxidation of fat in the liver for energy than those on a low-calorie diet, researchers at UT Southwestern Medical Center have found in a small clinical study.
Researchers have shown a correlation between fast food, weight gain, and insulin resistance in what appears to be the first long-term study on this subject. The Coronary Artery Risk Development in Young Adults (CARDIA) study by Mark Pereira, Ph.D., assistant professor in epidemiology, University of Minnesota School of Public Health, and David Ludwig, M.D., Ph.D., director of the Obesity Program at Children's Hospital Boston, reported that fast food increases the risk of obesity and type 2 diabetes. The results of this 15-year study will be published in the Jan. 1 issue of The Lancet.
A common diabetes medication is effective at treating symptoms of polycystic ovary syndrome, according to a Stanford University School of Medicine study. Nicholas Cataldo, MD, adjunct clinical instructor of obstetrics and gynecology, is presenting his findings at the annual meeting of the Endocrine Society in New Orleans.
A new study suggests that higher-than-normal amounts of a selenium-containing enzyme could promote type 2 diabetes. The researchers found that mice with elevated levels of the antioxidant enzyme develop the precursors of diabetes at much higher rates than did control mice.
Recent headlines about the health of the nation's youth have raised alarm, but a new study shows that the pervasiveness of the early stages of heart disease and diabetes among Latino children may be particularly disturbing. Three in 10 pre-teens in the University of Southern California Study of Latinos at Risk (SOLAR) Diabetes Project have the metabolic syndrome, a clustering of risk factors for type 2 diabetes and cardiovascular disease, according to investigators from the Keck School of Medicine of USC. Results appear in the January 2004 issue of the Journal of Clinical Endocrinology & Metabolism.
Men who have at least three metabolic abnormalities are at high risk of developing type 2 diabetes and heart disease, researchers report.
Using a new, simplified definition of the "metabolic syndrome"? the clustering of certain metabolic-related heart disease risk factors ? researchers predicted diabetes and coronary heart disease (CHD) at an early stage of disease development. This is noteworthy because early prediction might identify people who may benefit from aggressive lifestyle changes such as diet and exercise to delay or derail the disease process, says lead author Naveed Sattar, M.D., an honorary consultant in clinical biochemistry at the Glasgow Royal Infirmary in Scotland.
Elderly people may develop insulin resistance -- one of the major risk factors for diabetes -- because "power plants" in their muscle cells decline or fail with age, according to Howard Hughes Medical Institute researchers at Yale University School of Medicine. In studies of young and elderly people, the researchers found that older people had lower levels of metabolic activity in their mitochondria, the "factories" that provide power to cells. The findings suggest that reduced mitochondrial activity underlies insulin resistance, which is a major contributor to type 2 diabetes in the elderly.
People with short upper legs are more likely to have glucose intolerance or diabetes, researchers reported today at the American Heart Association's 43rd Annual Conference on Cardiovascular Disease Epidemiology and Prevention. The study seems to support the hypothesis that factors influencing growth in the womb and during childhood may contribute to the development of impaired glucose tolerance and diabetes, says Keiko Asao, M.D., M.P.H., and a Ph.D. candidate at Johns Hopkins University in Baltimore, Md. Impaired glucose tolerance is also called insulin resistance. It's a metabolic disorder in which the body cannot efficiently turn blood sugar (glucose) into energy.
People who eat breakfast are significantly less likely to be obese and diabetic than those who usually don't, researchers reported today at the American Heart Association's 43rd Annual Conference on Cardiovascular Disease Epidemiology and Prevention. In their study, researchers found that obesity and insulin resistance syndrome rates were 35 percent to 50 percent lower among people who ate breakfast every day compared to those who frequently skipped it. "Our results suggest that breakfast may really be the most important meal of the day," says Mark A. Pereira, Ph.D., a research associate at Children's Hospital in Boston and assistant professor at Harvard Medical School. "It appears that breakfast may play an important role in reducing the risk of type 2 diabetes and cardiovascular disease."
People with short upper legs are more likely to have glucose intolerance or diabetes, researchers reported today at the American Heart Association's 43rd Annual Conference on Cardiovascular Disease Epidemiology and Prevention. The study seems to support the hypothesis that factors influencing growth in the womb and during childhood may contribute to the development of impaired glucose tolerance and diabetes, says Keiko Asao, M.D., M.P.H., and a Ph.D. candidate at Johns Hopkins University in Baltimore, Md. Impaired glucose tolerance is also called insulin resistance. It's a metabolic disorder in which the body cannot efficiently turn blood sugar (glucose) into energy.
A child who is overweight and unfit may already be on the road to developing insulin resistance, an early sign of diabetes, researchers reported today at the American Heart Association's 43rd Annual Conference on Cardiovascular Disease Epidemiology and Prevention. Insulin sensitivity is a measure of how well the body responds to insulin, a hormone that transports carbohydrates from the blood into cells where they are turned into energy. High insulin sensitivity means the body is responding well to insulin. Low insulin sensitivity ? also called insulin resistance ? is often a precursor to diabetes.
Elderly men and women with normal body weight still may be at risk for developing type 2 diabetes if they have large amounts of muscle fat or visceral abdominal fat, according to a University of Pittsburgh study published in the February issue of the journal Diabetes Care. "Our study found that, even though an elderly person may not be overweight, he or she might still be at risk for developing diabetes," said Bret H. Goodpaster, Ph.D., of the University of Pittsburgh division of endocrinology and metabolism and principal investigator of the study. "An important factor is where in the body their excess fat is stored."
A new study in female mice links estrogen, lower blood pressure, and insulin resistance, despite a high fructose diet. The experiments demonstrate that the effects of a fructose diet on metabolism and blood pressure are dependent on sex gender. Female rats are protected against fructose-induced hypertension, unlike their male counterparts, and the mechanisms responsible for this protection appear to be related to female sex hormones. Furthermore, there appears to be a sex difference in the vascular actions of insulin, which may also be involved in the mechanisms responsible for the sex differences observed in this experiment. The results of these experiments represent a novel finding into the interrelationship among hyperinsulinemia, insulin resistance, and hypertension. The potential existence of sex differences in this intriguing association might help elucidate the mechanisms involved and are worthy of further investigation.
