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首页 » 糖尿病 » AJCN:常吃蓝莓和苹果者有助于降低患糖尿病风险

AJCN:常吃蓝莓和苹果者有助于降低患糖尿病风险

来源:新华网 2012-03-20 16:49

美国研究人员日前发表在《American Journal of Clinical Nutrition》上的一份研究论文显示,常吃蓝莓和苹果者有助于降低患糖尿病风险。不过研究人员也指出,这项研究仅表明这两种水果与糖尿病风险之间的关联,并不意味着吃这两种水果可以预防II型糖尿病。
 
在这项得到美国国家卫生研究院资助的研究中,哈佛大学公共卫生学院的研究者跟踪了约20万名卫生领域专业人士近24年的饮食习惯。研究对象需定期完成调查问卷,回答自己某些食品和饮料的消费状况。
 
在研究开始前,所有研究对象均未患糖尿病。但在研究期间,共有1.26万人报告患II型糖尿病。剔除其他因素后研究人员发现,吃蓝莓最多的人群(即每周至少进食456克蓝莓)患II型糖尿病的风险比吃蓝莓最少的人(每月进食不足114克蓝莓)低23%。每周吃至少5个苹果者患II型糖尿病的风险比不吃苹果者也要低23%。
 
II型糖尿病又称成年发病型糖尿病,其特点是胰岛素抵抗,即自身能产生胰岛素,但体内组织对胰岛素的作用不敏感,正常量的胰岛素起不到正常的降血糖作用。健康的饮食习惯和经常锻炼可降低患II型糖尿病的风险。
 
科研人员推测,蓝莓和苹果富含的类黄酮可能是导致糖尿病风险较低的积极因素。类黄酮是一种多酚类化合物,在水果、蔬菜、谷物中广泛存在。曾有研究表明,类黄酮具有保护心脏、降低患癌风险等益处。(生物谷 bioon.com)

Dietary flavonoid intakes and risk of type 2 diabetes in US men and women

Nicole M Wedick, An Pan, Aedín Cassidy, Eric B Rimm, Laura Sampson, Bernard Rosner, Walter Willett, Frank B Hu, Qi Sun, and Rob M van Dam

Background: Data from mechanistic studies support a beneficial effect of specific flavonoids on insulin sensitivity. However, few studies have evaluated the relation between intakes of different flavonoid subclasses and type 2 diabetes. Objective: The objective was to evaluate whether dietary intakes of major flavonoid subclasses (ie, flavonols, flavones, flavanones, flavan-3-ols, and anthocyanins) are associated with the risk of type 2 diabetes in US adults. Design: We followed up a total of 70,359 women in the Nurses’ Health Study (NHS; 1984–2008), 89,201 women in the NHS II (1991–2007), and 41,334 men in the Health Professionals Follow-Up Study (1986–2006) who were free of diabetes, cardiovascular disease, and cancer at baseline. Results: During 3,645,585 person-years of follow-up, we documented 12,611 incident cases of type 2 diabetes. Higher intakes of anthocyanins were significantly associated with a lower risk of type 2 diabetes (pooled HR for the 3 cohorts from a comparison of extreme quintiles: 0.85; 95% CI: 0.80, 0.91; P-trend < 0.001) after multivariate adjustment for age, BMI, and lifestyle and dietary factors. Consumption of anthocyanin-rich foods, particularly blueberries (pooled HR: 0.77 from a comparison of ≥2 servings/wk with <1 serving/mo; 95% CI: 0.68, 0.87; P-trend < 0.001) and apples/pears (pooled HR: 0.77 from a comparison of ≥5 servings/wk with <1 serving/mo; 95% CI: 0.65, 0.83; P-trend < 0.001), was also associated with a lower risk of type 2 diabetes. No significant associations were found for total flavonoid intake or other flavonoid subclasses. Conclusion: A higher consumption of anthocyanins and anthocyanin-rich fruit was associated with a lower risk of type 2 diabetes.

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