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Eating unpeeled apples may keep extra pounds and obesity-related diseases at bay, a study in PLoS ONE suggests. 《美国公共科学图书馆-综合》（PLoS ONE）杂志刊载的一项研究结果显示，苹果连皮吃能帮助减肥，使机体远离肥胖相关的疾病。 Ursolic acid is a natural compound found in the waxy coats on apples and other fruits and herbs. Previous research showed that ursolic acid increased the activity of a protein that stimulated muscle growth and glucose metabolism in mice. 熊果酸是一种在苹果及其他水果和草本植物的光滑表皮中发现的天然化合物。以往的研究表明，熊果酸能够增加一种蛋白质的活性，这种蛋白质可以刺激小鼠的肌肉生长及葡萄糖代谢。 In this follow-up study, researchers in Iowa tested ursolic acid on mice with diet-induced obesity. For six weeks, one group of mice had unlimited access to a diet of high-fat food proven to cause obesity, glucose intolerance and fatty liver disease. Two other groups of mice had unlimited access to the same diet, but supplemented with either 0.14 grams or 0.27 grams of ursolic acid per 100 grams of food. For comparison, an apple contains 50 milligrams of ursolic acid, equivalent to about 6% of the lowest dose given to the mice. 在这次的跟进研究中，爱荷华州的研究人员对患有饮食引起的肥胖症的小鼠进行了熊果酸测试。六周内，其中一组小鼠可以无限食用一种高脂肪食物，这种食物会引起肥胖症、葡萄糖不耐受和脂肪肝。其他两组小鼠也可以无限食用这种食物，但每100克食物分别配有0.14克和0.27克的熊果酸。一个苹果含50毫克的熊果酸，相当于给小鼠最低剂量的约6%。 | 
