It's one of my favorite experiences for just looking at sympathetic activation, fight or flight response, and just realizing you think you're in charge, but you're so not. (blog.bulletproof.com)
The mechanism that elicits sympathetic activation with water drinking remains unclear (17). (academic.oup.com)
Indeed, the maximal increase in metabolic rate after water drinking corresponds to the maximal sympathetic activation in previous studies (2, 3). (academic.oup.com)