一般认为吃素（蔬菜、水果）有益健康，而吃荤（鱼除外） 对健康不利， 尤其是吃红 肉是很多人所忌讳的。美国心脏学会倡导的“膳食防止高血压”（DASH）计划建议人们多吃水果、蔬菜、低脂奶和植物蛋白，以便降低血压和减少心脏病风险。 可是，美国和澳大利亚科学家的最新研究表明，牛肉是理想的蛋白质来源，它也像水果、蔬菜和低脂奶一样可以降低血压。因此，他们提出 用动物蛋白代替植物蛋白的改良DASH计划—— BOLD+ （ Beef in an Optimal Lean Diet plus additional protein ）。 该实验共招募了36位30-65岁的志愿者（收缩压平均为116毫米汞柱），所准备的4种 食物 添加了不同份量的牛肉：1. 美国健康食品（HAD）—— 每天 0.7盎司（20克）牛肉；DASH——每天1.0盎司（28克）牛肉；BOLD——每天4.0盎司（113克）牛肉；BOLD+——每天5.4盎司（153克）牛肉。实验 为期5周，在实验前后分别测定血压。 结果表明，BOLD+组的 血压（ 111.4毫米汞柱） 比HAD组的 血压（ 115.7毫米汞柱） 更低，而DASH与BOLD无显著差异。这表明血压降低取决于总蛋白质 的 摄取，而不是蛋白质的种类（动物或植物来源）。 Eating lean beef daily can help lower blood pressure, study suggests Date: July 17, 2014 Source: Penn State Summary: Contrary to conventional wisdom, new research suggests that eating lean beef can reduce risk factors for heart disease. The DASH eating plan -- Dietary Approaches to Stop Hypertension -- is currently recommended by the American Heart Association to lower blood pressure and reduce risk of heart disease. People following the DASH diet are encouraged to eat fruits, vegetables, low-fat dairy and protein predominantly from plant sources. Lean beef can be enjoyed as the predominant protein source in a DASH-like diet, along with fruits, vegetables and low-fat dairy, to effectively help lower blood pressure in healthy individuals, new research suggests. Contrary to conventional wisdom, a growing body of evidence shows that eating lean beef can reduce risk factors for heart disease, according to recent research by nutritional scientists. This research adds to the significant evidence, including work previously done in our lab, that supports lean beef's role in a heart-healthy diet, said Penny M. Kris-Etherton, Distinguished Professor of Nutrition, Penn State. This study shows that nutrient-rich lean beef can be included as part of a heart-healthy diet that reduces blood pressure, which can help lower the risk for cardiovascular disease. The DASH eating plan -- Dietary Approaches to Stop Hypertension -- is currently recommended by the American Heart Association to lower blood pressure and reduce risk of heart disease. People following the DASH diet are encouraged to eat fruits, vegetables, low-fat dairy and protein predominantly from plant sources. The Beef Checkoff Program and the National Institutes of Health-supported Penn State General Clinical Research Center funded this research. Lean beef can be enjoyed as the predominant protein source in a DASH-like diet, along with fruits, vegetables and low-fat dairy, to effectively help lower blood pressure in healthy individuals, the researchers report in the Journal of Human Hypertension . This DASH-like diet is also called the BOLD+ diet -- Beef in an Optimal Lean Diet plus additional protein. Kris-Etherton and colleagues tested four diets to find the effects on vascular health. The diets tested included the Healthy American Diet -- which served as the control -- the BOLD+ diet, the BOLD diet and the DASH diet. The control diet consisted of 0.7 ounces of lean beef per day, while the DASH diet included 1.0 ounce. The BOLD diet had 4.0 ounces and the BOLD+ diet included 5.4 ounces of lean beef. The researchers tested the four different diets with 36 participants, between the ages of 30 and 65. All participants followed each diet at different times throughout the study period. Subjects were randomly assigned an order to follow each of the four diet plans for five weeks each, with a break of one week in between each new plan. Blood pressure was taken at the beginning and end of each diet period. The BOLD+ diet was more effective at reducing blood pressure when compared to the other diets tested. This evidence suggests that it is the total protein intake -- not the type of protein -- that is instrumental in reducing blood pressure, as part of a DASH-like dietary pattern, the researchers stated. Working with Kris-Etherton were Michael A. Roussell, nutrition consultant; Sheila G. West, associate professor of biobehavioral health; Jan S. Ulbrecht, professor of biobehavioral health; John P. Vanden Heuvel, professor of veterinary science, all at Penn State; Alison M. Hill, lecturer in nutrition, University of South Australia; Trent L. Gaugler, visiting assistant professor of statistics, Carnegie Mellon University; and Peter J. Gillies, professor and director of the Institute for Food, Nutrition and Health at Rutgers, The State University of New Jersey. Story Source: The above story is based on materials provided by Penn State . The original article was written by Victoria M. Indivero. Note: Materials may be edited for content and length. Journal Reference : M A Roussell, A M Hill, T L Gaugler, S G West, J S Ulbrecht, J P Vanden Heuvel, P J Gillies, P M Kris-Etherton. Effects of a DASH-like diet containing lean beef on vascular health . Journal of Human Hypertension , 2014; DOI: 10.1038/jhh.2014.34
标签: 牛肉
