Weight loss is still incredibly challenging for most people, as evidenced by the growing global obesity epidemic.

　　据证据表明全球肥胖现象正在日益蔓延,对于大部分人来说，减肥仍然是一项艰巨的挑战，。

　　According to the latest Centers for Disease Control and Prevention statistics, more than two in three US adults are considered overweight (defined as a body- mass index between 25 and 30), and 36.5% of US adults fall into the obese category (BMI greater than 30).

　　根据疾病控制和预防中心的最新数据统计，超过三分之二的美国成年人属于超重(身体质量指数在25到30之间)，而36.5%的美国成人已经进入肥胖范畴(体质指数大于30)。

　　Many people also want to lose weight. According to a recent study in the Journal of the American Medical Association, approximately half of overweight and obese adults report that they are trying to lose weight. Which is why my patients often ask, "Why aren’t I losing weight?"

　　许多人也想减肥。《美国医学会杂志》最近的一项研究表明，大约一半的超重和肥胖人群说他们正在尽力减肥。那么我的病人们经常就会问：“为什么我没有减肥成功?”

　　There is no simple, universal answer to this question, but after nearly two decades of working with patients trying to lose weight, and with the help of two leaders in the field of nutrition and obesity medicine, I’ve put together this list of some of the most common behavioral and medical reasons you might not be losing weight, even though you think you are doing everything right. I’ve also tried to include suggestions to get you on the right track to sustained weight loss.

　　这个问题并没有一个简单而通用的答案，但是经过对那些尽力在减肥的病人长达近二十年的研究，以及两位营养学和肥胖医学界领军人物的协助下，我列出了一些可能导致你减肥失败的最常见的行为和医药方面的因素，尽管你可能认为自己没做错什么。我还尽力为你提供了建议来帮你走上减肥成功之路。

　　You have calorie ’amnesia’

　　你有热量“失忆症”

　　This is one of the most common and easy-to-fix issues that I see in my practice: Put simply, people often eat more calories than they realize.

　　这是我在实践中看到的最常见的，也是最容易解决的问题之一：简单来说，人们通常摄入的热量要比他们意识到的要多。

　　You relax your diet too much on weekends

　　你在周末太过放纵饮食了

　　This is another very common issue that is a bit more challenging to fix, as weekends are generally much less structured and more social than weekdays. Three days (Friday, Saturday and Sunday) of more relaxed eating (and in many cases drinking) can easily erase four days of more focused effort.

　　这是另一个很常见的问题，但是有点儿难以解决。因为周末相比工作日，缺少结构体系，而更偏向社会化。三天(周五，周六和周日)的大吃大喝(在很多情况下)很容易就将你前四天努力的成果抹除掉了。

　　Your medication is working against you

　　药物对你没什么好处

　　Most physicians do not receive adequate training in obesity medicine and nutrition. Many may not be aware that the medications they prescribe may lead to weight gain or make weight loss more challenging.

　　在肥胖医学和营养学方面，大多数内科医生都没有接受足够的训练。他们中许多人可能还没意识到他们开的药物可能会导致体重增加，或者使减肥变得更难。

　　You eat too much of a good thing

　　你好东西吃太多了

　　It is true that recommendations concerning dietary fat have changed in the past decade, and nutrition science has found that unsaturated fat, including nuts, seeds, avocado and olive oil, plays an important role in a healthy diet.

　　确实，关于饮食中脂肪方面的建议在过去十年里已经发生了改变，营养科学表明，不饱和脂肪，包括坚果、种子、鳄梨和橄榄油，在健康饮食中起着重要作用。

　　However, you can easily eat too much healthy fat along with other healthy foods, including whole grains.

　　然而，你很容易就会在吃其他健康食物的同时摄入过多的健康脂肪，包括全谷物类食物。

　　Your body is resistant to insulin

　　你的身体对胰岛素有抵抗作用

　　This is an issue I often encounter with patients and one that my colleague Dr. Michael Rothkopf, president of the National Board of Physician Nutrition Specialists, confirms is an often overlooked reason for weight loss failure.

　　这是我在病人身上经常遇到的一个问题，而我的同事，全美营养医师专业委员会主席迈克尔·罗特科普夫博士也证实，这是一个经常被忽视的导致减肥失败的原因。