In addition, our individual biochemistry causes us to perceive taste differently, and the exact same food containing the exact same substances can taste extremely different to different people. (whfoods.org)
Acid secretion is controlled by a hormone called gastrin (secreted in the presence of food and leading to secretion of stomach acid), acetylcholine (a neurotransmitter), and histamine (that same substance responsible for the unpleasant allergic effects of hay fever). (marvistavet.com)
He alleged that if a substance could produce the symptom an ill person was experiencing, an extremely small dose of that same substance could cure the symptom. (businessinsider.com)