You crave salt. Your adrenals may be screaming for help.

Your COMT gene produces an enzyme that breaks down catecholamines, the stress hormones epinephrine and norepinephrine. When this enzyme works normally, stress hormones spike during a threat, then quickly clear out. Your nervous system returns to baseline. Digestion restarts, your heart rate normalizes, and your adrenals get a break.

If you carry the Val158Met variant that slows COMT, roughly 25% of people with European ancestry do, catecholamine clearance slows down. Adrenaline and norepinephrine linger in your bloodstream long after the stressor passes. Your nervous system stays in fight-or-flight mode. Your heart stays elevated. Your adrenals keep pumping.

Chronically elevated stress hormones drive your kidneys to excrete sodium aggressively. Your blood volume drops. Your body interprets this as a threat and screams for salt. You feel exhausted but wired. Rest doesn’t fix it because the problem isn’t fatigue; it’s that your stress hormone off-switch doesn’t work properly.

Your FKBP5 gene codes for a protein that regulates glucocorticoid receptor function, the cellular machinery that lets cortisol communicate with your cells. When FKBP5 works normally, cortisol binds to its receptor, delivers its signal (suppress inflammation, release glucose, increase alertness), and then the receptor becomes less sensitive. This is called negative feedback. Once cortisol has done its job, your cells stop listening. The signal stops. Cortisol levels drop.

The rs1360780 variant in FKBP5, carried by roughly 30% of the population, impairs this negative feedback loop. Your cells remain sensitive to cortisol even after the threat has passed. Cortisol stays elevated. Your HPA axis continues signaling. Your adrenals keep working. Over time, this becomes exhaustion masked by an inability to truly relax.

Chronically elevated cortisol increases urinary sodium loss. Your kidneys throw away sodium as if you’re in a state of constant crisis. Your body can’t retain minerals. It screams for salt because it’s genuinely depleted at the cellular level. You feel wired and tired simultaneously.

Your NR3C1 gene encodes the glucocorticoid receptor itself, the actual receptor protein that cortisol binds to. Variants in this gene alter how efficiently the receptor can respond to cortisol at the DNA level, regulating genes that control inflammation, glucose, and sodium handling. The BclI and N363S variants, present in roughly 20-30% of the population, reduce receptor sensitivity or alter how it activates target genes.

When NR3C1 carries these variants, your cells are less efficient at responding to cortisol, requiring higher cortisol levels to achieve the same effect. This is called glucocorticoid resistance at the tissue level. Your body compensates by producing more cortisol, but the cells still don’t respond optimally. You’re running a sympathetic overdrive with an underpowered braking system.

This particular pattern drives severe salt cravings because your kidneys, under instruction from dysregulated cortisol signaling, lose sodium aggressively. You become a salt-losing machine. No amount of extra salt fixes it because the problem is at the receptor level, not dietary intake.

Your CYP21A2 gene encodes 21-hydroxylase, the enzyme that sits at the first committed step of cortisol and aldosterone synthesis in your adrenal cortex. Without this enzyme, your body cannot make either hormone. Variants in this gene, even minor ones not causing classical congenital adrenal hyperplasia, can slow the conversion of precursor hormones into functional cortisol and aldosterone.

If you carry a CYP21A2 variant affecting enzyme efficiency, even if it doesn’t meet the diagnostic threshold for CAH, your adrenals work harder to produce the same amount of cortisol. Your aldosterone output often falls behind, leaving you unable to retain sodium effectively. Aldosterone is the mineral-retention hormone. Without enough of it, sodium pours into your urine. Your blood volume contracts. Your body perceives a threat and drives thirst and salt appetite.

This gene creates a specific pattern: you crave salt intensely, you feel lightheaded when standing up quickly, and your blood pressure may be on the lower side. Salt supplementation actually helps, unlike in other patterns where it’s just a symptom band-aid.

Your MTHFR gene produces methylenetetrahydrofolate reductase, the enzyme that converts dietary folate into the active form your cells use for methylation reactions. Methylation is the cellular process that clears and recycles neurotransmitters, detoxifies hormones, and regulates gene expression. Cortisol clearance depends on adequate methylation capacity in your liver.

The C677T variant, carried by roughly 40% of people with European ancestry, reduces MTHFR enzyme activity by 40-70%. Your liver cannot efficiently methylate and clear cortisol. Cortisol lingers. Your body struggles to conjugate and excrete it. Your nervous system stays activated longer. Your adrenals keep receiving signals to keep working.

When methylation is impaired, your body also struggles to synthesize SAMe and phosphatidylcholine, both needed for stress resilience. You become more sensitive to stress. Your adrenals exhaust faster. The salt craving emerges from genuine sympathetic overdrive combined with impaired recovery between stress episodes.

Your SOD2 gene produces superoxide dismutase 2, the primary antioxidant enzyme in your mitochondria. When your adrenals are under chronic stress and constantly producing cortisol and catecholamines, the metabolic demand is enormous. Mitochondria burn fuel intensely. They produce reactive oxygen species as a byproduct. SOD2 neutralizes this oxidative stress, protecting the adrenal cells from damage.

Variants in SOD2, particularly the Ala16Val substitution common in roughly 50% of populations, reduce enzyme activity. Your adrenal mitochondria accumulate oxidative damage under chronic stress. The cells that produce your stress hormones are themselves under oxidative stress. They become less efficient. They require higher activation to produce the same amount of hormone. Your adrenals burn out faster.

This is a meta-problem: your genes make you sensitive to stress, and your antioxidant defenses are compromised, so the stress damages the very cells trying to protect you. You enter a downward spiral. Salt cravings emerge from a combination of sympathetic overdrive and genuine adrenal cellular exhaustion.