A healthy diet and regular exercise may help to prevent obesity(肥胖) among children。 Take Li Ming for example。Li Ming used to be a healthy boy， but Li Ming used to be a healthy boy， but great changes have taken place in 2003 and 2004。

The meal Li Ming ate every day included a lot of and different junk food which was bad for health。 What"s more， he watched TV lying on the sofa and eating snacks。 As a result， his weight went up day after day， he even had difficulties in climbing the stairs。

This made Li Ming so sad that he decided to get a new beginning in 2004。 Instead of junk food and snacks， Li Ming ate the healthy diet and took more exercise such as football， swimming， skating and running。

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At fast， he became as healthy as before， healthy diet and regular exercise helped him a lot。