短语讲解：

1. According to a new study, putting preschoolers in bed by 8 p.m. could reduce their chances of becoming overweight or obese later in life by half.

according to 根据，按照
例句：According to etiquette, you should stand up to meet a guest.
按照礼节你应该站起来接待客人。

2. The term ‘obese’ refers to calculations of your Body Mass Index, what doctors call BMI.

refer to 参考; 指的是; 涉及; 适用于
例句：Writers often refer to a dictionary.
作家时常参考字典。

3. The World Health Organization says obesity can lead to serious long-term health problems like diabetes, heart disease and stroke.

lead to 导致; 把…带到; 领到
例句：That may lead to a serious split in our class.
那可能导致我们班的严重分裂。

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