One study recruited 200 obese adults to take part in a 16-week-long diet, where half added dessert to their breakfast, and half didn't.

一项研究招募了200名肥胖的成年人，让他们参加一项为期16周的节食计划，这项计划中一半人的早餐中添加了甜点，而另一半没有。

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I've lost six and a half pounds since I started my diet.

从节食以来，我体重已减轻了六磅半。

《牛津词典》

According to a study, more than half the teenage girls in the USA think they should be on a diet and almost one in five teenage boys are worried about their bodies and their weight.

根据一项研究，在美国，超过一半的少女认为她们应该节食，几乎五分之一的少年男孩担心自己的身体和体重。

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The other half ate a controlled diet.

VOA: special.2009.09.01

As I mentioned before is one example on the risk for breast cancer in women, so you'd randomly assign half to following their usual diet, the other half to an intervention program where people are prescribed a low fact diet, given counseling and interventions from dieticians and things, and then you look to see what happens for risk as people go forward in time.

我之前提过,这例子研究的是,女性的乳腺癌发病率,你将随机选择其中一半人按一般习惯饮食,另一半人则参与一个干预计划,其中每人都要食用,由营养学家设计推荐的低脂肪菜单,然后再看随着时间推移,被试者的发病率是怎样变化的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Two years later those who ate the Mediterranean diet had half the risk of heart attack and sudden cardiac death compared with those who stayed on the regular low-fat diet, even though their cholesterol declined only a modest 14%.

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For more than two months, researchers at Rockefeller University in New York and Harvard tested several different types of low fat diets on 18 people with normal cholesterol levels, including a diet containing more than half a pound of steamed shrimp a day.

CNN: Shrimp's high cholesterol may not be so bad

The low protein-diet group gained about seven pounds, about half the 13.3 pounds added on by the normal protein participants and 14.4 pounds put on by the high protein group.

WSJ: New Ways Calories Can Add Up to Weight Gain