we shouldn't eat grains or food made from milk, such as butter and cheese. Instead, they say, we should only eat plenty of lean meat (瘦肉) and fish, with fruit and raw vegetables on the side.

　　The idea, also called the caveman, or hunter­gatherer diet, has been around for decades and was discussed at a meeting of the British Society for Allergy, Environmental and Nutritional Medicine.

　　According to Lauren Cordain, a nutritionist at Colorado State University who presented the idea to the meeting, those following the meat­centered menu "lose weight and get healthy by eating the food you were designed to eat". He says there is increasing evidence that a caveman diet can prevent and treat many common western diseases. Studies of islanders in Papua New Guinea who still live a hunter­gatherer lifestyle show they rarely suffer from heart disease.

　　But other nutritionists argue that cutting out whole food groups such as grains is just not a good idea.

　　"I would recommend anybody to eat lean meat and raw vegetables，" says Toni Steer of the MRC human nutrition research unit at Cambridge. "But what you're asking people to do is cut out a food group which is good for your health."

　　Archaeologists say it's not even clear exactly how much of the various foods people actually ate during the Stone Age.

　　"There was no one Stone Age diet; diets of the past varied greatly，" says John Gowlett, an archaeologist at the University of Liverpool who also attended the conference. Prehistoric people in Africa probably ate less meat than many people think, he says, while those in the northern, icy areas were forced to eat only whatever animals they could catch.

　　"I'm not convinced that we know what Stone Age man ate，" agrees Andrew Millard, who researches ancient health and diet at Durham University. "The evidence we have only suggests the meat component of the diet. We get bones from animals they have eaten but we don't get the remains of any vegetables they have eaten because they rot (腐烂) away."

　　语篇解读：本文是一篇议论文。有营养学家认为，像我们石器时代祖先那样以肉为主的吃法有益健康，对此很多研究者表示怀疑。

　　5．To improve your health, Cordain suggests ________.

　　A．losing weight first

　　B．eating less meat and fish

　　C．going on the Stone Age diet

　　D．eating more fruit and vegetables

解析：选C　推理判断题。根据第三段中的"According to Lauren Cordain ... those