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SCIENCE

Hookworm therapy reverses diabetes in clinical trials

Saturday, May 16, 2026 · from 1 podcast
  • Controlled hookworm infection reduced blood glucose and insulin resistance in a two-year human trial.
  • Eradicating the parasite a century ago may have triggered modern autoimmune and metabolic epidemics.
  • Live organism therapy faces FDA barriers, pushing researchers toward synthetic protein substitutes.

Modern medicine accidentally deleted a biological partner, and our health has been unraveling ever since. According to data presented on Radiolab, a two-year Australian clinical trial led by Dr. Paul Jackerman gave live hookworms to pre-diabetic patients. The results were startling: participants saw significant reductions in blood glucose levels and lost weight, while the placebo group continued to decline. Some patients were effectively cured of their pre-diabetic status. Almost every participant opted to keep their worms after the trial ended.

The trial adds concrete evidence to a hypothesis that has been circulating in niche research circles: that the eradication of hookworms triggered the modern epidemic of autoimmune and metabolic diseases. Rockefeller's 1908 commission targeted the parasite to fix what was perceived as the 'lazy' South, linking anemia to sandy loam soils. Researchers built sandbox experiments showing larvae could crawl four feet from infected stool, leading to the adoption of outhouses dug six feet deep.

"We've ignored the macrobiome. These are the visible organisms that evolved with us for millions of years."

- Dr. Paul Jackerman, Radiolab

The campaign successfully traded historical lethargy for modern asthma, allergies, and Crohn's disease. Dr. Paul Jackerman argues that without these co-evolved parasites, which secrete immune-quieting proteins he calls 'lullaby cells,' our internal defenses go rogue. Dixon Despommier notes that improved sanitation, while reducing diseases like salmonella and cholera, also removed this key immune regulator.

Practical application faces a massive regulatory impasse. Jasper Lawrence once ran a business mailing hookworms to desperate patients - he was inspired by research showing asthma was 50% less likely in people with infections - before the FDA forced him to flee the country. The therapy's raw material is human waste, requiring human 'worm farms' to produce larvae. Every dose is slightly different, making standardization and traditional FDA approval pathways nearly impossible.

Researchers are now pivoting to a synthetic solution: identifying the specific proteins worms secrete and manufacturing them in a lab. Until that pill arrives, patients remain stuck between illegal self-infection and waiting for a decade of pharmaceutical development. The data from Jackerman's trial, however, suggests the biological path already works.

"You cannot easily culture hookworms in a lab; you need human 'worm farms' to produce the larvae."

- Radiolab

Source Intelligence

- Deep dive into what was said in the episodes

Your Friendly Neighborhood HookwormsMay 15

  • John D. Rockefeller launched a commission in 1908 to investigate Southern economic stagnation, which attributed it to a laziness disease.
  • Rockefeller's investigators later linked anemia in the South to sandy loam soils and discovered hookworm infections were the cause.
  • Researchers built a sandbox experiment showing hookworm larvae could crawl four feet from infected stool, leading to the adoption of outhouses dug six feet deep.
  • Dixon Despommier argues improved sanitation and outhouses eradicated hookworm and also reduced diseases like salmonella, cholera, and giardia.
  • Jasper Lawrence discovered research showing asthma was 50% less likely in people with hookworm infections, leading him to seek infection in Cameroon.
  • Lawrence infected himself by walking barefoot in 30-40 village latrines and reported his allergies and asthma disappeared completely afterward.
  • Lawrence later started a business selling hookworms to about 85 clients, sourcing them from his own stool, despite lacking FDA approval.
  • David Pritchard's safety study found 10 hookworms were tolerated, but 50 worms caused gut pain and potential anemia from blood loss.
  • Paul Giacomin's research uses worm farms where volunteers host hookworms to produce eggs for clinical trials, delivered via bandages on skin.
  • Hookworm larvae enter through skin, travel via lymphatics and bloodstream to the lungs, are coughed up and swallowed, maturing over two to three weeks before settling in the small intestine.
  • Adult hookworms bite the intestinal wall to feed on blood, initially causing inflammation and diarrhea, then release proteins that promote wound healing and quiet the immune system.
  • Giacomin's two-year trial on pre-diabetic patients showed hookworm treatment reduced blood glucose and insulin resistance, with some patients no longer pre-diabetic.
  • Almost all participants in Giacomin's trial opted to keep their worms after the study, and placebo-controlled trials for celiac disease reported improved well-being, mood, and sleep quality.
  • Research links hookworms to potential benefits for multiple sclerosis, ulcerative colitis, and Crohn's disease, with some patients entering remission.
  • The hygiene hypothesis posits that eliminating parasites like hookworms through improved sanitation may contribute to increased autoimmune disorders.
  • Current hurdles for hookworm therapy include sourcing from stool, standardization challenges, and public aversion, leading researchers like Giacomin to pursue developing isolated worm proteins in pill form.