大学英语：Though their common aim may seem basically good

　　1. Though their common aim may seem basically good， they probably do not realize that misguided dieting can do more harm than good to their health.

　　2. 语法：冠词的顺序问题

　　a strict diet 试比较 too strict a diet (很严格的饮食)

　　a great quantity of books 试比较 as great a quantity of books (大量的书)

　　3. Much less food than usual 此处的much放在比较级less前起到一个强调的作用;less是little的比较级

　　4. What(what在主语从句中做realize的宾语，指事，所以用what) they do not realize， however， is that carbohydrates are our bodies' main source of energy.

　　5. As a result， they try to avoid eating(avoid这个动词后如果加动词应该用动词的ing形式) these foods， and consequently， they become weaker and less(less是little的比较级) healthy.

　　6. They begin to have difficulty sleeping(省略介词in) properly and start to suffer from radical mood changes.

　　7. In fact， such artificial sweeteners actually increase one's appetite and lead to one's eating even more than usual.

　　8. Of course， the fact that misguided forms of dieting result in so many problems does not mean that no dieting is safe or all dieting is harmful to the health.

　　9. Well-balanced 均衡的

　　10. Skimmed milk 脱脂牛奶

　　11. Instead of regular milk， one can take skimmed milk， which contains as many proteins and minerals as regular milk but has had the fat removed.(has是完成时态的助动词;had表示使，让;跟在has后面用了have的过去分词形式had;由于脂肪发不出remove的动作，所以用了remove的过去分词形式)

　　12. In the same way， vegetable oil can be used for cooking instead of animal oil.