Potassium

Potassium functions as a primary intracellular ion whose selective association with cellular proteins, rather than membrane pump activity, determines the cell's energetic and hydrated state. 6 Ray Peat adopted Gilbert Ling's association-induction hypothesis, which holds that healthy cells, when acidified by the oxidative production of carbon dioxide, preferentially bind potassium while excluding sodium and calcium. 7 In this framework, potassium's presence inside the cell is a consequence of high oxidative metabolism; when CO₂ and ATP production falter, the cell becomes alkaline, loses potassium and magnesium, and takes up sodium, calcium, and water, leading to the swelling characteristic of low thyroid states. 7

Peat emphasized that potassium exerts an insulin-like action, capable of escorting glucose into cells independently of insulin. 2 This property makes potassium-rich foods such as sweet, ripe orange juice particularly valuable for stabilizing blood sugar without provoking the stress hormone cascades associated with hypoglycemia. 4 Roddy has noted that stress causes the body to waste potassium, and that this excessive loss, or hypokalemia, has been identified as an independent predictor of diabetes, a mechanism consistent with potassium's role in glucose disposal. 9 Peat argued that a dietary deficiency of potassium is almost never a concern when consuming a varied diet, as the mineral is abundant in fruits and vegetables. 1

The balance between potassium and sodium is central to Peat's understanding of adrenal and thyroid physiology. He explained that in a low-thyroid individual, the inability to retain sodium leads to its loss in urine, triggering a compensatory rise in aldosterone. 7 This elevated aldosterone promotes the exchange of magnesium for sodium, shifts the autonomic balance toward inflammation, and is a key factor in heart failure. 7 While sodium is needed to absorb glucose and amino acids and has a recognized anti-adrenalin effect, potassium at appropriate levels protects against high blood pressure by relaxing blood vessels. 2 Peat cautioned, however, that an excess of potassium, particularly from isolated supplements like potassium chloride, can dangerously slow the heart rate or even stop it. 2

Peat acknowledged that the precise mechanistic details of how potassium interacts with aldosterone from a Lingian perspective remained an open question during his lifetime. 3 He noted that the contemporary researcher William Frederick Koch had demonstrated that administering extra potassium, sodium, or magnesium could compensate for a deficiency of another mineral, such as calcium, after the removal of parathyroid glands. 10 This functional interchangeability underscores a principle in Peat's work: the systemic, bioenergetic context—governed by thyroid hormone and oxidative metabolism—determines how an ion behaves, rather than a fixed, pump-driven membrane physiology. 2