請問下列這句英文,開頭為何是使用where呢?謝謝 Where overdosing on coffee may make you jittery,green tea has just enough caffeine ..............................?

原句:

Where overdosing on coffee may make you jittery, green tea has just enough caffeine to boost production of the hormone adrenocorticotropin, which triggers the release of cortisol.

1. which triggers the release of cortisol 是用來修飾 the hormone adrenocorticotropin 的關係子句.

2. 除了(1) 所說的以外:

Where overdosing on coffee may make you jittery, green tea has just enough caffeine to boost production of the hormone adrenocorticotropin.

= (for the situations)　Where overdosing on coffee may make you jittery, green tea has just enough caffeine to boost production of the hormone adrenocorticotropin.

= Green tea has just enough caffeine to boost production of the hormone adrenocorticotropin for the situations where overdosing on coffee may make you jittery.

＝在狂飲咖啡讓你雀躍不已的那些(可能)情況中，綠茶（卻）有剛好足量的咖啡因　提高你ＸＸ荷爾蒙的產量．

3. where ....在這裡應該是副詞子句，用來修飾後面跟隨的主要子句．

4. Other examples:

(A) where you fell, I weep.
(B) What you said, I do.
(C) When she cries, I too.

where=conjunction=the place or situation in which:-
(That's ) where (=the point in the argument at which)overdosing on coffee may make you jittery, green tea has just enough caffeine.....