Though not fully researched and proven, your metabolic rates could be being altered by diet foods, including the low-calorie sweetener saccharin, which increases the chance of weight gain.

尽管这还没有确切的研究证明，但是你的新陈代谢速度可能被减肥食物所改变，包括低热量的甜味剂糖精，它增大了你获得体重的机率。

youdao

Another study suggests smoking cessation boosted high density lipoprotein cholesterol even though it was associated with weight gain.

另外一项研究显示，在体重增加的时候，戒烟使得脂蛋白胆固醇密度上升。

youdao

And like many others, I also tend to gain weight during the holidays - some people can gain 5 or more pounds (though for most it's usually only a couple pounds).

在假期里我也和多数人一样长了很多肉——有些人能胖5磅甚至更多(不过大多数人只会胖1,2磅)。

youdao

Raising the general testosterone level, though, has unfortunate side-effects: weight gain, acne and irritability.

ECONOMIST: Contraception