The Slows — a 19th-century chronic syndrome with a 21st-century equivalent

The original presentation

In the early 19th century, milk sickness was responsible for an estimated 25 percent of deaths in some Ohio and Indiana counties. The acute form — high-dose tremetol exposure through cow's milk — produced vomiting, severe weakness, prostration, coma, and death within days. The most famous documented case is Nancy Hanks Lincoln, who died of milk sickness in Spencer County, Indiana, in October 1818, when her son Abraham was nine years old.

Less visible, and less often counted as the same disease, was the chronic form. Settlers and physicians used several names — the trembles for the cattle version, milk sickness for the acute human form, and the Slows for the long, wasting low-dose presentation: gradual weakness, exhaustion, cognitive fog, and what 19th-century medicine called melancholia, lasting months or years. Settlers in the affected regions described entire households living for years in a half-impaired state, attributed to weak constitution, the climate, or unspecified bad water.

The mechanism

The agent is tremetol, a ketone alcohol compound produced by two plants:

• White snakeroot (Ageratina altissima) — native to eastern and midwestern woodlands; the original 19th-century source
• Rayless goldenrod (Isocoma pluriflora), also called Jimmy Weed — native to the Texas/New Mexico/Southwest range; same toxin, same mechanism

A cow grazes the plant, fresh or dried in hay. Tremetol passes unchanged into the milk. The cow may continue to appear healthy while her milk is toxic — the toxin accumulates faster in human consumers than in the producing animal. Toxicity in milk has been documented to precede toxicity in the cow by weeks.

In the human body, tremetol suppresses citrate synthase, the entry-point enzyme of the citric-acid cycle in the mitochondria. The result is pathological ketoacidosis — chemically the inversion of therapeutic ketosis. Therapeutic ketosis improves neurotransmitter function and cognitive clarity. Tremetol-driven ketoacidosis produces neuroinflammation, cerebral oxidative stress, and a defining sign of the chronic presentation: persistent depression.

Why it disappeared from medicine

Milk sickness became rare in the 20th century for two reasons. First, the dairy industry consolidated: pooled milk from many herds diluted any single contaminated source. Second, the plant came to be recognised and managed in pastures.

Tremetol itself was not eliminated. The plants still grow. Modern peer-reviewed agricultural literature continues to document tremetol toxicity in cattle, in milk, and in cull-cow meat — including a 2025 paper in the Journal of Agricultural and Food Chemistry identifying tremetol tracking in lactating cows as a cornerstone of safety for "both dairy products and beef meat."

The modern symptom match

The diagnostic vocabulary changed. Whether the underlying mechanism in any individual case is also new is a separate question — one this site documents the evidence around rather than answers. The chronic low-dose presentation of tremetol exposure — the Slows — matches the symptomatology now distributed across at least four modern diagnoses:

• Chronic Fatigue Syndrome / Myalgic Encephalomyelitis
• Fibromyalgia
• Major Depressive Disorder (treatment-resistant variants in particular)
• Generalised Anxiety Disorder with cognitive-fog presentation

None of these diagnoses include tremetol testing. The standard food-safety panel does not include tremetol. The standard clinical-toxicology screen does not include tremetol. A modern patient whose chronic-subclinical presentation matches the 19th-century description has no pathway by which a tremetol-exposure cause would ever be ruled in or out.

What changed about the supply chain

The structural conditions that increase tremetol risk are the conditions of modern organic dairy:

• Stored hay (not exclusively pasture grazing) is standard for organic dairy, because organic certification limits supplementation
• No herbicide use is mandatory for organic certification — toxic plants in source fields can only be removed by hand or mowing
• National hay sourcing is now routine; a single nationwide USDA-organic hay supplier serves dairy operations and horse farms across the country, dramatically increasing the blast radius of any contaminated field
• Consolidation toward large CAFOs, away from small family farms, reduces visibility into individual feed sources

This site documents the mechanism. It does not name specific dairies, hay suppliers, or supplier brands. The reader who is concerned can check their own supplier through the public record.