Recent studies show that grapefruit and diabetes may share a close link. Researchers concluded that naringenin found in grapefruit may increase the body's sensitivity to insulin. This research was conducted only in the laboratory, and further studies are still needed. Grapefruit and diabetes may share a close link given some recent studies suggesting that eating of the fruit can help in controlling the disease. One recent report suggests that grapefruit may become an effective part of the treatment for type 2 diabetes as it contains the antioxidant Naringenin that can break down fats and increase a person's sensitivity to insulin.
The study also concluded that grapefruit is also capable of treating abnormal levels of cholesterol, warding off metabolic syndrome and improving a person's tolerance to glucose, factors that are all associated with diabetes. The study was conducted by scientists from the Massachusetts General Hospital Center for Engineering in Medicine and Hebrew University of Jerusalem. Although more research needs to be completed, grapefruit is a safe source of vitamins for diabetics. One-half of a grapefruit contains 52 calories and 13g of carbohydrates, and the fruit has a low rating on the glycemic index, indicating a lower propensity to drive up blood sugar levels.
The antioxidant Naringenin is found in grapefruit and has been largely credited for its ability in heping to treat type 2 diabetes. Naringenin is specifically noted for being able to break down fatty acids in the liver, similar to what happens when a person undergoes fasting. Yaakov Nahmias, PhD of the Hebrew University of Jerusalem reports that the results of their study indicate that Naringenin antioxidant was found to be capable of breaking down fatty acids similar to those induced by significant amounts of fasting. It does so by activating nuclear receptors, a family of proteins that can cause the liver to break down fatty acids instead of storing them.
Another study conducted by researchers at the University of Western Ontario showed that Naringenin can correct increases in triglyceride and cholesterol levels, while resisting insulin resistance and normalizing glucose metabolism. The said study showed that Naringenin genetically reprograms the liver to burn up more excess fat, instead of storing it. The said study also showed that Naringenin is able to suppress appetite and decrease food intake, which are common strategies in controlling diabetes.
The study of MGH and Hebrew University scientists also noted that Naringenin can lower bad cholesterol called vLDL while able to cure several symptoms of type 2 diabetes.
Research on grapefruit and diabetes, however, has not yet been conducted on humans, and were only done in the laboratory on the liver cells of humans and rats. Until further studies are done to confirm the effects of grapefruit in the treatment of diabetes type 2 in humans, it is still not safe to conclude that the naringenin in grapefruits can indeed cure diabetes. Further studies are still needed to establish its efficacy as well as its overall effects in the body, including the negative effects it might have.
Thus, many health experts do not encourage patients with diabetes to increase their consumption of grapefruits or increase grape juice intake, especially if they are also taking medications. There are patients prescribed with some type of drugs to lower their cholesterol level who are advised not to drink grapefruit juice as it can increase risk of side effects.
New research into the health benefits of beetroot juice suggests it's not only athletes who can benefit from its performance enhancing properties – its physiological effects could help the elderly or people with heart or lung-conditions enjoy more active lives.
Beetroot juice has been one of the biggest stories in sports science over the past year after researchers at the University of Exeter found it enables people to exercise for up to 16% longer. The startling results have led to a host of athletes – from Premiership footballers to professional cyclists – looking into its potential uses. A new piece of research by the university in conjunction with the Peninsula College of Medicine and Dentistry has revealed the physiological effects of drinking beetroot juice could help a much wider range of people.
In the latest study, published in the Journal of Applied Physiology, the researchers looked at low intensity exercise and found that test subjects used less oxygen while walking – effectively reducing the effort it took to walk by 12%. Katie Lansley, a PhD student from the university's Sport and Health Sciences department and lead author of the study, said: “As you get older, or if you have conditions which affect your cardiovascular system, the amount of oxygen you can take in to use during exercise drops considerably. This means that, for some people, even simple tasks like walking may not be manageable. “What we've seen in this study is that beetroot juice can actually reduce the amount of oxygen you need to perform even low-intensity exercise. In principle, this effect could help people do things they wouldn't otherwise be able to do.”
When consumed, beetroot juice has two marked physiological effects. Firstly, it widens blood vessels, reducing blood pressure and allowing more blood flow. Secondly, it affects muscle tissue, reducing the amount of oxygen needed by muscles during activity. The combined effects have a significant impact on performing physical tasks, whether it involves low-intensity or high-intensity effort. So far the research on the impacts of beetroot juice has only been carried out on younger people who are in good health, but the researchers believe there is no reason why the effects of beetroot juice wouldn't help others. “While we haven't yet measured the effects on the elderly or those with heart or lung conditions, there is the potential for a positive impact in these populations which we intend to go on and investigate further,” Katie Lansley added.
Beetroot juice contains high levels of nitrate. The latest study has proved that this is the key ingredient which causes the increase in performance, rather than any other component of the beetroot juice. Professor Andy Jones, the senior scientist on the study and a pioneer of research into beetroot juice, said: “In this study, we were able to use – for the first time – both normal beetroot juice and beetroot juice with the nitrate filtered out. Test subjects didn't know which one they were getting. The drinks both looked and tasted exactly the same. Each time the normal, nitrate-rich juice was used, we saw a marked improvement in performance which wasn't there with the filtered juice – so we know the nitrate is the active ingredient.”
Could the Mediterranean diet actually help prevent diabetes? The Mediterranean Diet, which is rich in vegetables, fruits, whole grains, healthy fats from nuts and olive oil, with moderate amounts of fish, low-fat dairy, and wine, and minimal red meat and processed meats, is considered to be an especially healthy eating plan.
Previous research conducted on newly diagnosed diabetic participants showed the diet did indeed help control the sugar spikes. The previous study found the mediterranean diet eating diabetics had better glycemic control. Furthermore, they had less needs for diabetes medications when adhering to the Mediterranean diet as opposed to a simple low-fat diet.
Recently, a team of researchers in Spain conducted a study using data from a large clinical trial to determine the effects of the Mediterranean Diet on preventing the onset of Type-2 diabetes. Participants were followed for an average of 4 years. Upon completion of the study, 54 participants had developed diabetes–but the split varied significantly among groups. The researchers found that the risk of developing diabetes was reduced by 52% among both groups of people who followed the Mediterranean Diet plans compared to the low-fat control group. In analyzing diet adherence, the researchers further noted that the closer an individual followed the Med-Diet plan, the lower their risk of developing diabetes. Interestingly, the weight of all participants did not change significantly throughout the study, nor did it vary significantly among the three groups.
The participants were divided in one of three groups: adherence to the Med-Diet with 1 liter per week of extra virgin olive oil, adherence to the Med-Diet with 1 oz per day of mixed nuts, or a standard low-fat diet as a control. No calorie restrictions were imposed on any of the groups. The two Med-Diet groups were instructed to increase fruit and vegetable intake, decrease meat intake, stay away from refined sweets and unhealthy fats such as butter, and consume red wine in moderation, if desired. The control group was given general instructions to lower overall fat intake. Baseline measurements and annual follow-up involved an oral glucose tolerance test and interviews to assess diet adherence.
Interestingly, the weight of all participants did not change significantly throughout the study, nor did it vary significantly among the three groups.
This study reinforces prior study results suggesting that the Mediterranean Diet – even without weight loss – may be protective against Type-2 diabetes. The researchers suggest that future studies should focus on the Med-Diet’s effects on younger people, and point out the possible benefits of the Mediterranean Diet as an effective intervention against complications of Type-2 diabetes.
A dietary supplement of the synthetic derivative of vitamin B1 has the potential to prevent heart disease caused by diabetes, according to new research from the University of Bristol, funded by Diabetes UK. Vitamin B1 may help the body to dispose of toxins and therefore protect cells of the heart from becoming damaged.
Diabetes leaves the heart more vulnerable to stress as less oxygen and nutrients are delivered to the heart and other organs. Heart damage can be caused by high levels of glucose entering cardiovascular cells, which forms toxins that accelerate the ageing of the cell. Around 50 per cent of people with diabetes die from cardiovascular disease, and this complication is the leading cause of death among people with diabetes. Researchers warn that with increasing prevalence of diabetes ( around one in twenty people in the UK are now diagnosed with the condition ), diabetes will result in a new epidemic of heart failure unless new treatments are developed.
A team of researchers at the University of Bristol gave a synthetic derivative of vitamin B1 called benfotiamine to mice with and without diabetes. They found that treating mice with Type 1 or Type 2 diabetes with benfotiamine from the early stages of diabetes can delay progression to heart failure. They also found that the vitamin B1 derivative improved survival and healing after heart attacks in Type 1 mice ( and even in the mice without diabetes too ). Foods rich in vitamin B1 include Marmite, yeast and quorn, but it is not yet known whether changes to diet alone would provide enough of the vitamin to see the same effects as supplements achieved in mice.
Previous Diabetes UK-funded research at the University of Warwick was the first to show that people with Type 1 and Type 2 diabetes have around 75 per cent lower levels of vitamin B1 than people without diabetes. It is thought that this may not be due to diet, but due to the rate at which the vitamin is cleared from the body. Small scale clinical trials of people with Type 2 diabetes have also discovered a link between taking vitamin B1 supplements and a reduction in the signs of kidney disease.
The latest research has been published in the Journal of Molecular and Cellular Cardiology. Professor Paolo Madeddu who led this research at the University of Bristol said “Supplementation with benfotiamine from early stages of diabetes improved the survival and healing of the hearts of diabetic mice that have had heart attacks, and helped prevent cardiovascular disease in mice with both Type 1 and Type 2 diabetes. We conclude that benfotiamine could be a novel treatment for people with diabetes, and the next step in this research will be testing whether similar effects are seen in humans.”
Dr Victoria King, Head of Research at Diabetes UK said “Diabetes UK is pleased to have supported this research and is encouraged by these promising results which now need to be tested and confirmed in human trials. We would like to note that it’s still too early to draw any firm conclusions about the role of vitamin B1 in the prevention of complications and we would not advise that people look to vitamin supplements to reduce their risk of cardiovascular complications at this stage. Taking your prescribed medication, eating a healthy balanced diet and taking regular physical activity are key to good diabetes management and therefore reducing your risk of diabetes associated complications.”
Benfotiamine improves functional recovery of the infarcted heart via activation of pro-survival G6PD/Akt signaling pathway and modulation of neurohormonal response by Rajesh Katare, Andrea Caporali, Costanza Emanueli, Paolo Madeddu in the Journal of Molecular and Cellular Cardiology.
Cardiovascular and lung researchers at The Ohio State University Medical Center are the first to report a direct link between air pollution and diabetes. If the ongoing research continues to confirm this association, scientists fear human health in both industrialized and developing countries could be impacted.
“We now have even more compelling evidence of the strong relationship between air pollution and obesity and type II diabetes,” said Dr. Sanjay Rajagopalan, section director of vascular medicine at Ohio State's medical center and principal investigator of the study. The latest study builds upon previous research from Rajagopalan's team implicating air pollution as a major adverse risk factor for cardiovascular effects, high blood pressure and acute coronary syndromes.
Researchers found that exposure to air pollution, over a period of 24 weeks, exaggerates insulin resistance and fat inflammation. The results of the study are available online in the current issue of Circulation. “The prevalence of obesity has reached epidemic proportions with 34 percent of adults in the U.S., ages 20 and over, meeting the criteria for obesity,” said Rajagopalan. “Obesity and diabetes are very prevalent in urban areas and there have been no studies evaluating the impact of poor air quality on these related conditions until now.”
Type II diabetes, a consequence of obesity, has soared worldwide with a projected 221 million people expected to suffer from this disease in 2010, a 46 percent increase compared to 1995.
In the Ohio State research, scientists fed male mice a diet high in fat over a 10-week period to induce obesity and then exposed them to either filtered air or air with particulate matter for six hours a day, five days a week, over a 24-week period. Researchers monitored measures of obesity, fat content, vascular responses and diabetic state. The air pollution level inside the chamber containing particulate matter was comparable to levels a commuter may be exposed to in urban including many metropolitan areas in the U.S.
According to the U.S. Environmental Protection Agency, the four most common pollutants emitted into the air are particulate matter, ozone, nitrogen dioxide and sulfur dioxide. Air pollution is commonly the result of industrial emissions, power plants and automobile exhaust.
“This study provides additional guidance for the EPA to review air pollution standards,” says Rajagopalan. “Our study also confirmed a need for a broader based approach, from the entire world, to influence policy development.”
Dr. Qinghua Sun, first author of the study, is leading an international effort to understand the effects of urban air pollution in Beijing, where the impact of recent stringent measures on air quality during the Olympics is being monitored in another controlled experiment. Researchers at the University of Michigan and the New York University School of Medicine participated in the study. Along with Rajagopalan and Sun, other Ohio State researchers involved in the study were Peibin Yue, Jeffrey A. Deiuliis, Thomas Kampfrath, Michael B. Mikolaj, Ying Cai, Michael C. Ostrowski, Bo Lu, Sampath Parthasarathy and Susan D. Moffatt-Bruce.
Funding from the National Institutes of Health supported this research.
Steering clear of full-fat, fried, and processed foods is not just good for overall health, it could help prevent chronic lung conditions, a large UK study has revealed.
Led by Seif Shaheen, Professor of Respiratory Epidemiology at Barts and The London School of Medicine, the study – involving 1,551 men and 1,391 women with an average age of 66 – showed that those whose diet favoured fresh fruit and vegetables, oily fish and wholegrain products had far better lung function than those who chose a diet high in fat, sugar and processed food.
The diets of those involved were investigated to assess what kinds of food they consumed on a regular basis. Their lung function was also tested using a spirometer, a device which measures the amount of air that a person can blow out of their lungs in one second. This simple test illustrates how healthy the lungs are, and determines whether any blockage or obstruction exists in the airways. If the airways are obstructed, the person is diagnosed with Chronic Obstructive Pulmonary Disease (COPD).
The study also revealed that the beneficial effects of the sensible diet were particularly strong in men who smoked.
Lung health in particular may be positively affected by a sensible diet because of the antioxidants contained in fruit and wholegrains, and the omega-3 fatty acids found in oily fish – that protect the lungs against the adverse effects of smoking.
Professor Shaheen said: “Whilst cessation of smoking is still the number one way to improve lung health, this study is important because it suggests that cases of COPD might be prevented if people, especially male smokers, ate more fruit and vegetables, oily fish and wholegrain cereals, and less white bread, sugar, full fat dairy products, fried food and processed meat. However, the only way to confirm this would be to carry out a randomised controlled trial.”
The new study looked into the effects of four different diet combinations on blood lipid metabolism, in 117 patients with metabolic syndrome.
In accordance with previous suggestions, the researchers found that a low-fat, high-complex carbohydrate diet had “several detrimental effects”, including significantly increasing total triglyceride levels, and triglyceride rich lipoprotein cholesterol levels.
In contrast, intake of the same diet supplemented with omega-3 was found to have no effects on blood lipid levels, with researchers observing that a diet rich in monounsaturated fats, or a low-fat diet rich in complex carbohydrates and omega-3 fatty acids, resulted in lower circulating blood lipid levels than a diet rich in high saturated fats or a diet low in fats and high in complex carbohydrates.
The data from the study suggest a place for higher omega-3 intake in people with metabolic syndrome, and supports previous research that suggests monounsaturated fatty acids can have a positive effect on blood lipid levels.
“The long-term effect of the low-fat, high-complex carbohydrate diet, pre vs. post intervention phases, showed several beneficial effects of long chain omega-3 PUFA supplementation,” stated the researchers.
“Our data suggest that long-term intake of an isocaloric, low-fat, high-carbohydrate diet supplemented with long chain omega-3 … have beneficial effects on postprandial lipoprotein response in patients with metabolic syndrome,”
Source: The Journal of Nutrition
“A Low-Fat, High-Complex Carbohydrate Diet Supplemented with Long-Chain (n-3) Fatty Acids Alters the Postprandial Lipoprotein Profile in Patients with Metabolic Syndrome”
Authors: Y. Jimenez-Gomez, C. Marin, P. Perez-Martinez, et al
Light has been cast on the interaction between broccoli consumption and reduced prostate cancer risk. Researchers writing in BioMed Central's open access journal Molecular Cancer have found that sulforaphane, a chemical found in broccoli, interacts with cells lacking a gene called PTEN to reduce the chances of prostate cancer developing.
Richard Mithen, from the Institute of Food Research, an institute of BBSRC, worked with a team of researchers on Norwich Research Park, UK, to carry out a series of experiments in human prostate tissue and mouse models of prostate cancer to investigate the interactions between expression of the PTEN gene and the anti-cancer activity of sulforaphane. He said, “PTEN is a tumour suppressor gene, the deletion or inactivation of which can initiate prostate carcinogenesis, and enhance the probability of cancer progression. We've shown here that sulforaphane has different effects depending on whether the PTEN gene is present”.
The research team found that in cells which express PTEN, dietary intervention with SF has no effect on the development of cancer. In cells that don't express the gene, however, sulforaphane causes them to become less competitive, providing an explanation of how consuming broccoli can reduce the risk of prostate cancer incidence and progression. According to Mithen, “This also suggests potential therapeutic applications of sulforaphane and related compounds”.
Beetroot juice, a source of high nitrate levels, may help prevent high blood pressure, according to a study published in Hypertension. Nitrate is a compound that increases the amount of gas nitric oxide that circulates through the blood.In an effort to determine if beetroot juice contains enough nitrate to lower blood pressure, researchers had two groups of individuals either drink the juice or take nitrate capsules.
The results of the study showed that within 24 hours, the supplements and the juice had lowered the blood pressure of people in both groups. Furthermore, the investigators discovered that about 250 mL of beetroot juice was all that was needed to have the same effects on one's blood pressure as the nitrate capsules.
These findings showed that “beetroot and nitrate capsules are equally effective in lowering blood pressure, indicating that it is the nitrate content of beetroot juice that underlies its potential to reduce blood pressure,” said Amrita Ahluwalia, lead researcher of the study.
New research from the University of Ulster today offered hope to millions of lupus sufferers worldwide. Dr Emeir Duffy, from the School of Biomedical Sciences, and Dr Gary Meenagh, from Musgrave Park Hospital, Belfast, have discovered new evidence to suggest that fish oil can greatly reduce the symptoms of the disease.
Systemic Lupus Erythematosus (SLE) or Lupus is a disorder of the Immune System, where the body harms its own healthy cells and tissues. The body tissues become damaged causing painful or swollen joints, unexplained fever, skin rashes, kidney problems, complications to the cardiovascular system and extreme fatigue. There are approximately 500 diagnosed cases of SLE in Northern Ireland and it is most common in women of child-bearing age.
At present there is no cure but a key to managing lupus is to understand the disease and its impact. Steroids are the main drug used in the treatment of lupus and they should be administered for the shortest period possible to reduce side-effects. But recently researchers have been looking specifically at its management through diet.
Fish oils contain long-chained polyunsaturated fatty acids which are essential for normal growth and development but also have anti-inflammatory and anti-autoimmune properties. Dr Duffy said: “We have been investigating how fish oil can improve the quality of life for lupus sufferers. “In lupus, the body's immune system does not work as it should. Antibodies, which help fight viruses, bacteria and other foreign substances, are not produced effectively. The immune system actually produces antibodies against the body's own healthy cells and tissues. These auto-antibodies contribute to inflammation and other symptoms of the disease.
“Participants in the study who were taking fish oil supplements, three times per day for twenty-four weeks, saw a reduction in disease activity, an improvement in quality of life and reported an overall feeling of improved health by the end of the study compared to those taking a placebo supplement. Participants taking the fish oil also showed a reduction in fatigue severity, the most debilitating symptom for lupus sufferers. “From our study and from other work, there is evidence that increasing dietary intake of the polyunsaturated fats found in fatty fish can have beneficial effects for lupus sufferers. Good examples of fatty fish include mackerel, lake trout, herring, sardines, tuna and salmon”.