講解：

Today's key word is Obesity.

Obesity 肥胖，肥胖癥

Obesity is a medical condition in which excess (額外的) body fat has reached the level that it may have a negative effect on health.

Here's an example：
Sugar and fat can more easily lead to obesity than some other foods.
糖和脂肪比其他食物更容易導致肥胖.

In Western countries, people are considered obese when their body mass index or BMI exceeds 30 kg/m2.
Some East Asian countries use stricter criteria. BMI is a measurement obtained by dividing a person's weight by the square of the person's height, 體質指數（BMI）=體重（kg）÷身高^2（m）
Commonly accepted BMI ranges are Underweight: under 18.5, Normal weight: 18.5 to 25, Overweight: 25 to 30, Obese: over 30.

Now let’s learn the word in the news.
A recent report concluded that grandparents are a significant factor in the growing level of childhood obesity in China. They tend to over feed youngsters in their care and excuse them from taking part in physical exercise.

討論:
近期，一項調查報告指出中國兒童肥胖率增加的重要原因是爺爺奶奶和姥姥姥爺。
他們認為，老人照看小孩時讓孩子吃得太多，運動太少。
不止是兒童，成年人的肥胖率也逐年上升。
不僅僅中國，歐美國家也存在此類問題。
你對自己的身材滿意嗎？
有用過什么有效的減肥方法嗎？分享一下吧！