The doctor told me (that) I should eat less fat.

医生嘱咐我要少吃油腻。

《牛津词典》

Doctors often extol the virtues of eating less fat.

医生常常宣扬少吃脂肪的好处。

《牛津词典》

People should eat less fat to reduce the risk of heart disease.

人们应该少吃脂肪以减少患心脏病的风险。

《柯林斯英汉双解大词典》

A low-fat diet is one in which less than thirty percent of a person's daily calorie intake comes from fat.

VOA: special.2011.07.05

Fat is not all that much different, but one thing that's happened is the type of fat has changed a lot, and so people are eating less fat from plant sources and more fat from animals sources That's where the saturated fat comes in and high saturated fat intake is not a good thing.

脂肪摄入量相差无几,然而脂肪的种类却发生了很大变化,人们越来越少从植物中摄取脂肪,而更多是从肉类食物中获得,肉类食物中含有饱和脂肪酸,而过多地摄入饱和脂肪酸是有害的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But if you put a less healthy fat in you get some improvement but less.

如果加入的是不那么健康的脂肪,那么对食物质量的改善就很有限

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Oddly, the official figures suggest that Americans are eating less fat than in the early 1980s.

ECONOMIST: That other national expansion

Camel's milk has less fat and more vitamins than cow's milk.

BBC: Milking a camel

In general, people with the gene variant who also consumed the highest fat diets were seven times more likely to develop Alzheimer's than individuals with the susceptibility mutation who ate less fat.

BBC: High fat diet link to Alzheimer's