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Scientific study reveals health benefits of red raspberries
A detailed review of the scientific literature
published in the January issue of Advances in
Nutrition has revealed the numerous health
benefits of raspberries. These include the
potential role of red raspberries in helping to
reduce the risk of metabolically-based
chronic diseases, including cardiovascular
disease, diabetes mellitus, obesity, and Alzheimer's disease: all of which share critical metabolic, oxidative, inflammatory links.
Red raspberries contribute a number of valuable essential nutrients, including providing an excellent source of vitamin C and nine grams of fiber per cup. They are also among the few plant foods that provide a source of ellagitannins and anthocyanins in the same package. The evidence is suggesting that the action of these nutrients and phytochemicals in the body hold the key to red raspberry's health promoting properties.
"Turns out what is good for the heart, is also good for the brain. That is what is particularly interesting about the research on red raspberries - their potential to help reduce factors contributing to metabolic syndrome which has implications for diabetes development and overall cardiovascular and brain health," says Britt M. Burton-Freeman, PhD, MS of the Center for Nutrition Research, Institute for Food Safety and Health, Illinois Institute of Technology, and lead author of the paper.
Animal and cellular studies have shown that after red raspberry exposure or feeding, ellagic acid, the primary breakdown product of ellagitannins, can reduce oxidative stress and inflammation. While these studies show the potential to help decrease atherosclerosis development, increase vasodilation and lower blood pressure, the next step is to verify and validate this effect in humans.
In the review of the scientific literature, limited studies suggests that different polyphenolic components of red raspberries have biological activity that could be clinically relevant in reducing disease risk and or management of diabetes, including helping to improve insulin responses and reducing blood glucose levels.
Research conducted in mice fed a high fat diet found that the addition of raspberry ketones decreased body weight and increased the breakdown of fat. This study was popularized in the media, but the effects of raspberry ketones have not been adequately tested in human studies, primarily because it is difficult to replicate the concentrations of raspberry ketones (2% of diet) used in the animal studies.
Raspberries have the highest fiber content compared to other berries (9 grams per cup). Dietary fiber is associated with satiety and helping to reduce food intake, which can assist with weight control.
Studies on the role of red raspberries with respect to Alzheimer's disease are very limited, although the association between red raspberry or its polyphenol components in reducing oxidative stress, inflammation, and improving insulin signaling can be considered promising for Alzheimer's disease risk reduction as well slowing the ageing process. Dr. Burton-Freeman suggests that the available data supports further research on the role of red raspberries in preserving brain health.
For more information, please visit redrazz.org.
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Publication date: 2/12/2016
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