IGNITE Firefighters' Health

Last updated: January 7, 2026
Sponsor: Stanford University
Overall Status: Active - Not Recruiting

Phase

N/A

Condition

Inflammation

Neoplasms

Cancer

Treatment

Usual Firehouse Diet

Whole Foods Plant-Based Diet

Clinical Study ID

NCT06567561
IRB-75777
NCI-2025-01830
  • Ages > 18
  • All Genders
  • Accepts Healthy Volunteers

Study Summary

Investigators hope to learn about potential dietary intervention strategies (specifically a whole-food, plant-based diet) that may help lower cancer markers in firefighters.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  • Age 18+

  • Active SF firefighter

  • Willing to consume a plant-based diet (vegetables, fruit, whole grains, legumes,etc.)

  • Willing to complete 4 clinic visits

Exclusion

Exclusion Criteria:

  • Weight < 110 lb

  • BMI >= 40

  • Self-reported uncontrolled hypercholesterolemia, hypertension or diabetes

  • Pregnant, lactating, or planning to become pregnant during the course of the study.

  • Use of any of the following drugs/supplements within the last 2 months:

  • systemic antibiotics, antifungals, antivirals, or antiparasitics (intravenous,intramuscular, or oral);

  • corticosteroids (intravenous, intramuscular, oral, nasal or inhaled);

  • cytokines;

  • methotrexate or immunosuppressive cytotoxic agents.

  • Chronic, clinically significant, or unstable (unresolved, requiring ongoing changesto medical management or medication) pulmonary, cardiovascular, gastrointestinal,hepatic or renal functional abnormality, as determined by medical history, Type 1diabetes, dialysis

  • History of active cancer in the past 3 years except for squamous or basal cellcarcinomas of the skin that have been medically managed by local excision

  • Unstable dietary history as defined by major changes in diet during the previousmonth, where the subject has eliminated or significantly increased a major foodgroup in the diet.

  • Recent history of chronic excessive alcohol consumption defined as more than five 1.5-ounce servings of 80 proof distilled spirits, five 12-ounce servings of beer orfive 5-ounce servings of wine per day; or > 14 drinks/week.

  • Any confirmed or suspected condition/state of immunosuppression or immunodeficiency (primary or acquired) including HIV infection, multiple sclerosis, and Graves'disease.

  • Surgery of the GI tract, with the exception of cholecystectomy and appendectomy, inthe past five years. Any major bowel resection at any time.

  • Regular/frequent use of smoking or chewing tobacco, e-cigarettes, cigars or othernicotine-containing products

  • Regular use of prescription opiate pain medication

Study Design

Total Participants: 120
Treatment Group(s): 2
Primary Treatment: Usual Firehouse Diet
Phase:
Study Start date:
January 09, 2025
Estimated Completion Date:
March 30, 2026

Study Description

The purpose of the San Francisco (SF) Firefighter's Diet Study is to determine if a diet low in processed foods, mostly plant-based, with added fermented foods, can lower the risk of cancer in firefighters. We will assess this by randomly assigning SF firefighters to either a whole-food, plant-based diet or their usual firehouse meals. Participants will be followed for 12 weeks.

Connect with a study center

  • Stanford University

    Palo Alto, California 94305
    United States

    Site Not Available

  • Stanford University

    Palo Alto 5380748, California 5332921 94305
    United States

    Site Not Available

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