You know the standard explanations: keeping a moderate diet, engaging in regular exercise, etc.
2016年6月四級真題（第三套）閱讀 Section C
英語六級真題
And one of the most popular explanations, among some experts and the popular media, is that excessive "screen time,, is to blame.
2019年12月六級真題（第一套）閱讀 Section B
I suspect that some experts in the field will be keen to address alternative explanations, such as unassessed variables playing a role in the well-being decline.
2019年12月六級真題（第一套）閱讀 Section B
柯林斯高階英漢雙解學習詞典釋義
N-COUNT
解釋;說明
If you give an explanation of something that has happened, you give people reasons for it, especially in an attempt to justify it.