Bohr effect

The Bohr effect describes the phenomenon whereby carbon dioxide (or acidity) displaces oxygen from hemoglobin, facilitating its delivery to tissues. 9 Peat argued that this principle, first elucidated by Christian Bohr in 1903, is not limited to hemoglobin but is a general effect applying to proteins throughout the body. 2 When carbon dioxide binds to amino groups on proteins, it changes their conformation and isoelectric point, making them less accessible to oxygen and thereby protecting against oxidative damage. 3 This stands in contrast to the conventional medical view that treats carbon dioxide merely as a waste product; Peat considered it a fundamental stabilizer of cellular structure and function. 7

The Bohr effect is intrinsically linked to the Haldane effect, which states that high oxygen pressure displaces carbon dioxide from hemoglobin. 9 Peat emphasized that these two effects describe a reciprocal destabilization of binding, meaning that breathing pure oxygen or hyperventilating causes a rapid loss of carbon dioxide, paradoxically leading to tissue hypoxia despite high blood oxygen saturation. 2 Dinkov has elaborated on this clinical misinterpretation, noting that a recently deceased person can have 100% oxygen saturation precisely because the oxygen is no longer being released to tissues in the absence of carbon dioxide. 6 This reciprocal relationship explains why lactic acid production increases when carbon dioxide is deficient; the resulting alkalosis from carbon dioxide loss provokes a compensatory shift toward lactate, which itself suppresses respiration and increases capillary leakiness. 2

Peat extended the significance of the Bohr effect to explain the health benefits observed at high altitude. At altitude, lower atmospheric oxygen pressure allows the body to retain more carbon dioxide, which through the Bohr effect ensures efficient oxygen delivery to tissues and suppresses the formation of lactic acid, a phenomenon known as the lactate paradox. 2 This retention of carbon dioxide makes cellular respiration more efficient and is credited with the lower incidence of degenerative conditions such as cancer, heart disease, and cataracts seen in high-altitude populations. 2 Peat noted that wounds heal faster at altitude and that studies involving tens of thousands of patients showed a negative correlation between altitude and cataract incidence, an effect powerful enough to override the increased ultraviolet radiation exposure. 2

At the cellular level, Peat situated the Bohr effect within a broader critique of membrane physiology, arguing that the whole substance of the cell, particularly its structural proteins, is involved in life processes. 2 The loss of carbon dioxide and a shift toward lactic acid production increases the electrical charge on structural proteins, causing them to separate and absorb water in a swelling pathology that characterizes conditions from cataracts to heart failure. 2 Roddy has summarized this bioenergetic view by noting that carbon dioxide, produced by properly respiring cells, essentially "breathes oxygen into us," and that its stabilizing role dampens the activation of stress systems. 2 Peat maintained that stress, shock, inflammation, and organ failure are, in important ways, respiratory problems rooted in the disruption of the carbon dioxide equilibrium described by the Bohr effect. 2