雅思阅读材料：美国教师三个月只吃麦当劳瘦了17公斤

　　John Cisna, a science teacher in Ankeny, Iowa, enlisted his students help him with an experiment: He wanted to see what would happen if he only ate McDonald’s for three months.

　　约翰·西斯那是美国爱荷华州安可尼市的一名科学老师，他和自己的学生们共同完成了一项实验：他想知道连续三个月只吃麦当劳快餐会是什么结果。

　　Inspired by the film Super Size Me, Cisna planned to put together an amateur documentary about the process.

　　受到纪录片《大号的我》的启发，西斯那计划以一个非专业人士的视角重新记录这一过程。

　　小编注：《大号的我》是一部2004年录制的纪录片，主人公一个月内只吃精加工、高脂肪的麦当劳食物，一个月后他的健康垮了。

　　Following a strict 2,000-calorie diet, Cisna had his students construct meals for him using McDonald’s online nutritional information.

　　在他的学生的帮助下，他依据麦当劳网站上的食品营养信息，设计了一份每天2000卡路里的食谱。

　　They also tried to stay close to the recommended dietary allowances for carbohydrates, fat, proteins, and cholesterol.

　　他们尽量不让食物中含有的糖类、蛋白质、脂肪以及胆固醇超过推荐标准。

　　Cisna didn’t heavily restrict himself; a typical breakfast would be two egg white McMuffins and a bowl of maple oatmeal, lunch would be salad, and dinner would be a value meal — like a cheeseburger and fries.

　　但西斯那并没有对自己过于苛刻：他的早餐是2个蛋清汉堡、一碗枫燕麦片，约翰午餐经常吃沙拉，晚餐通常选择麦当劳的传统食物，如起司汉堡加薯条。

　　“So this isn’t something where you say, ‘Well, he went to McDonald’s and he only had the salads,’” he said. “No, I had the Big Macs, the quarter pounders with cheese. I had sundaes, I had ice cream cones.”

　　“我并没有像有些人说的那样，‘去麦当劳只吃沙拉’”，他说，“事实上，我吃了带奶酪的大汉堡巨无霸，我吃了圣代，我还吃了冰淇淋甜筒。”

　　The owner of the local franchise was so interested in how the experiment would turn out that he agreed to provide the 90 days of meals to Cisna for free.

　　当地的麦当劳经营商对他的实验很感兴趣，并为他免费了3个月的提供食物。

　　In addition to watching his caloric intake, Cisna also began walking 45 minutes a day. Cisna admits that before the experiment, he didn’t exercise or monitor his eating habits.

　　除了注意自己的卡路里摄入量之外，西斯那还每天步行45分钟。西斯那承认，在这项实验之前，他既没有锻炼的习惯，也没有控制过饮食。

　　When the experiment was over, Cisna had lost 37 pounds and brought his cholesterol down to 170 from 249.

　　三个月的实验结束之后，西斯那瘦了37磅(约17公斤)，胆固醇从249降低到了170。

　　“I can eat any food at McDonald’s I want as long as I’m smart for the rest of the day with what I balance it out with,” Cisna said.

　　西斯那说，“ 只要我能在中控制好热量标准，我就可以在麦当劳随心享用任何高热量的食物了。”