As for me(1),I enjoy a good health as I keep a simple diet with more vegetables,fruit and less meat.Moreover,I do some exercises whenever I have time such as long distance running,playing tennis or volleyball.As a result(2),I have been a top student all through the four years in the university.So good health is important to everyone(3).

　　(1)发挥了承上启下的作用，没有这样一个介词短语，从第二段过渡到第三段就会显得生硬一些。(2)也起到了连贯作用，在上述两方面保持健康的方法介绍完后，应该进一步写出所产生的结果，这结果就是对全段的总结概括。(3)对文章的标题及开头起了首尾呼应的作用。