Long ago, there lived in Greece a learned man. He was so well-known{#blank#}1{#/blank#}his knowledge of almost everything that lots of people from all over the country came to learn from him. The great man{#blank#}2{#/blank#}(teach) his students whole-heartedly and answered their questions with great{#blank#}3{#/blank#}(patient).

    One day, a student asked him, “My dear teacher, didn't you say you yourself have many more questions about things than we do?{#blank#}4{#/blank#}I think we students have far more than you.”

    With a smile on his face, the teacher drew two circles, one as large as a big cake, the other smaller. Then he said, “Of course, I have learned much more. But it is wrong{#blank#}5{#/blank#}(think) a teacher has fewer questions than his students. Now, look at these two circles. The inside of the{#blank#}6{#/blank#}(big) one is my knowledge of things, and the inside of the smaller one is{#blank#}7{#/blank#}(your). Out of the circles is what is still unknown to us. Since mine is larger, I have to use the longer line to draw the bigger circle. That means I have more opportunities to face something{#blank#}8{#/blank#}(know). And that's{#blank#}9{#/blank#}I myself have more questions than you do. The{#blank#}10{#/blank#}(much) you learn, the more questions you have. You will never learn enough, you know.”

    Rhiannon Lambert, who treats about 180 clients a year with various kinds of eating disorders, says the number of those caused by "clean eating" {#blank#}1{#/blank#} (double) in the past three years. "They develop particular habits, or won't eat food when walking, because they think that food can only be eaten when they {#blank#}2{#/blank#} (seat)," she said.

    Clean eating is promoted by some food bloggers, who are increasingly thought by a number of medical experts to be having a bad influence on young people today. "Young people lose this and cannot afford the lifestyle needed to follow it," Lambert said. Health bloggers {#blank#}3{#/blank#} not have enough knowledge but offer dangerous advice. These people are now role models {#blank#}4{#/blank#} word will inspire young people. I have clients who think they have to be a strict vegetarian to be successful. The extreme form of this is known as orthorexia nervosa (健康食品强迫症).

    Ursula Philpot, a dietitian at the British Dietetic Association, said, "It is difficult to blame them completely. If it weren't the bloggers, then it could be {#blank#}5{#/blank#} else. Orthorexia affects more girls than boys, although boys are much more affected than girls." Philpot said, "At the top of most people's lists of bad foods includes gluten (麸质) and dairy. {#blank#}6{#/blank#} you talk to young people more, you will find some of them worry all day about eating a biscuit."

    The condition starts out as an attempt {#blank#}7{#/blank#} (eat) more healthily, but those who experience it fully focus on food quality and purity. "There may be several reasons for someone to take up clean eating," Philpot said. "Eating disorders are serious mental illnesses and their causes are complex. Research is telling us that they may be more biologically based than we thought, {#blank#}8{#/blank#} social and environmental factors also play a part in their development."

    Deanne Jade, the founder of the National Centre for Eating Disorders, said, "A lot of young people don't think they need treatment and there are too many messages in the media. What worries me is that a lot of people {#blank#}9{#/blank#} (promote) these ideas have no knowledge of nutrition. I don't know what the solution is, but in many cases, getting people to recover from an eating disorder means {#blank#}10{#/blank#} (get) them to relax their ideas about clean eating."