HealthMap

The Myth of Alkaline Water and Blood pH

• No effect on blood pH: Drinking alkaline water does not alter systemic human blood pH.
• Strict physiological regulation: The human body maintains arterial blood pH within a very tight, slightly alkaline range of 7.35 to 7.45 through powerful homeostatic mechanisms, primarily involving the lungs and kidneys.
• Gastric neutralization: When alkaline water enters the stomach, it immediately encounters strong hydrochloric acid. The stomach acid neutralizes the alkalinity long before the water ever reaches the bloodstream.
• Biochemical reality: If systemic blood pH were to significantly shift outside of the normal range—even by a fraction of a point—it would result in a medical emergency known as acidosis or alkalosis, not a state of improved health.
• Urinary pH vs. Blood pH: Consuming alkaline substances may sometimes temporarily influence urine pH as the kidneys excrete excess minerals to maintain strict internal blood balance, but this does not reflect a change in systemic blood chemistry.