短语讲解：

1. And this could lead to overeating.

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。

2. But over a week, a month, or a year, all that food can really add up.

add up 加起来; 总计; 与应有的数量相符
例句：Let' s add up the pros and cons.
咱们把正反两方面的意见总结一下吧。