So how come individuals have higher BMIs when they snack at night?

那为什么研究里面说晚上进食的人常有高BMI呢？

According to a survey by Jefferies, an investment bank, Americans who earn less than $15,000 a year have the highest BMIs.

根据投资银行杰富瑞的一项调查，年收入低于 15,000 美元的美国人的 BMI 最高。

A survey involving 484 boys, aged 15 to 18, found those who spend more time in front of screens, had higher BMIs and lesser bone density than boys who spent more time outside.

一项调查研究了484名15到18岁的男孩子，研究发现相较于喜欢在户外的男生，用电脑时间长的男生身体质量指数更高，骨骼密度更低。

Specifically, people who eat larger breakfasts and adopt an 18-hour overnight fast, say from 1 pm to 7 am, have the lowest body weights. Those who ate more than three meals, or three meals plus snacks, had higher BMIs.

具体而言，早餐吃得多、18小时（下午1点-早上7点）空腹的人，体重指数最低。一天吃三顿以上，或者三餐加零食，体重指数会更高一些。