Cool article.

Altering of hormonal balance - A far too frequently ignored cost. A lot of activities will change your hormonal balance for the better or worse. Entering into conflict-like situations can and does increase adrenalin and cortisol and other stress hormones. Then you face adrenalin withdrawal and crash later.

Could you go into more detail, or recommend a place to go to read about more on this? I don't see this factor mentioned much elsewhere.