【正确答案】
With the development of social economy, people pay more and more attention to their health and going on a diet becomes extremely popular. It keeps people from growing too fat and saves them from many inconveniences and diseases related to fatness. At the same time, it provides people with sufficient nutrition to keep them in a healthy condition. Besides its good effects on people's health, going on a diet can also help many young girls become slim and bring their dream into reality.
However, if carried too far, going on a diet could become extremely dangerous. It often happens in the cases of young girls. With all their eagerness to have a beautiful figure, they will even risk their lives to lose weight. The tragedy of young Carpenter has proved this. Even if it doesn't cost their lives, it will damage their health to a certain degree.
Thus, apart from its positive effects, going on a diet has its bad side effects. The proper way to do it is to put health in the first place. If it is good for our health, stick to it; if not, just abandon it.

【答案解析】[解析] 文中首段可以提出节制饮食的好处，并举例说明，如使人健康苗条等。中间段再从反方面阐述过度节制饮食的危险性，最后得出结论，即节制饮食应适当，以保持健康为准则。