the answer to why only some of us put on weight lay in the genes that control the body's metabolism,只有一部分人会发胖的原因来自人体里控制新陈代谢的基因

put on weight:增加体重

Too many sweet foods may make you put on weight.

太多的甜食可能会使你增加体重。

I'm afraid I am putting on weight.

我担心我增加体重啦。

the rate at which food is broken down and turned into energy.即食物消化并转化成能量的速度

break down:分解

Sugar and starch are broken down in the stomach.

糖和淀粉在胃里被分解。

turn into:（使）变成；进入

The whole thing turned into a bitter quarrel.

整件事酿成了激烈的争吵。

I myself was involved in a Horizon programme in the '90s我本人90年代参与了地平线的一个项目

involve in:卷入； 陷入

I got involved in a quarrel about the price.

我被卷入了一场有关价格的争吵。