Metabolic rhythms such as ketogenic metabolism and intermittent fasting are widely used to improve metabolic health. However, some individuals experience reproducible symptoms during these states, including dehydration, fatigue, nausea, and electrolyte instability. These symptoms are often attributed to transient sodium loss during early ketogenic adaptation, yet persistent patterns of electrolyte disturbance remain incompletely explained. This paper proposes the KICO hypothesis, a systems physiology model suggesting that combinations of ketogenic metabolism, intermittent fasting rhythms, and chronic dehydration may function as physiologic loads on regulatory timing systems governing electrolyte balance. In this framework, metabolic rhythm influences regulatory interpretation through neurohormonal systems including the renin–angiotensin–aldosterone system (RAAS). Sustained volume-conservation signaling may alter renal ion transport through mechanisms such as NKCC2 activity in the loop of Henle and pendrin-mediated chloride–bicarbonate exchange in the distal nephron. These processes may favor chloride retention relative to bicarbonate, producing a hyperchloremic non–anion gap metabolic acidosis (NAGMA) terrain. The hypothesis extends recent heart failure literature describing the regulatory role of chloride in plasma volume distribution and RAAS activation by proposing that metabolic load patterns may generate chloride-dominant terrain states earlier in the physiologic sequence. Within this model, electrolyte terrain signals may precede overt cardiovascular disease. If correct, this framework predicts that longitudinal analysis of routine chemistry panels may reveal characteristic chloride–bicarbonate drift patterns—high-normal chloride, reduced CO₂, normal anion gap, and preserved creatinine—in individuals exposed to sustained metabolic rhythms capable of producing volume contraction and buffering demand. This paper represents the metabolic execution layer of the Lantern of Sulfur Concept A triad, which links circadian timing architecture, metabolic load patterns, and downstream cardiovascular expression. Companion papers describe the other two layers of the system:• Regulatory timing layer — Circadian and Metabolic Timing in Electrolyte Regulation: A Coupled Clock Model Linking Metabolic Load, Chloride Terrain Signals, and Cardiovascular Stress, Lantern of Sulfur, Concept A, v12.1, March 2026• Clinical cardiovascular expression layer — Reversible HFrEF-The Pattern Five Specialties Missed, Lantern of Sulfur, Concept A, v12.4, March 2026Together these papers describe a vertical regulatory sequence linking physiologic timing architecture, metabolic load patterns, electrolyte terrain signals, and cardiovascular expression. The framework is hypothesis-generating and intended to support further investigation into the interaction between circadian physiology, metabolic rhythm, and electrolyte regulation.
Beth Ann Martell (Wed,) studied this question.