Those would be classified as controllable risk factors.

这些将被归类为可控风险因素。

The first controllable factor is thermic effect of food, or TEF.

第一个可控的因素是食物热效应，也就是 TEF。

Because there are definitely some controllable factors that contribute to the afternoon slump, but part of it is actually natural.

因为其中一些导致下午犯困的原因肯定是能够掌控的，不过另一部分原因就是正常的生理反应了。