【正确答案】Nowadays there are more and more people who are overweight, including many children and some adults. There are many factors contributing to this, such as the unhealthy diet, lack of exercises and the unbalance of nutrition. The unreasonable structure of the diet is one of the most important causes of overweight.
   Overweight will lead to inconvenience of daily  life  and many possible diseases, such as high blood pressure and heart attacks and even some negative psychological effects. So to keep healthy, we should, first of all, try to balance our diet. Doing some exercises as many as possible also plays an important role in losing weight.