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Firefighters fight fat: new coaching trial aims to slim down first responders

NCT ID NCT06890975

Disease control Sponsor: Cambridge Health Alliance Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tests whether a 9-month lifestyle coaching program (individual and group sessions with a dietician) helps obese male firefighters lose weight and improve metabolic health. Fifty participants will be randomly assigned to coaching or usual care. The main outcomes are changes in body mass index, body fat, waist size, and waist-to-hip ratio.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
lifestyle coaching (individual and group sessions with a dietician)
What this could lead to
If it works, this could provide an effective weight-loss and health-improvement program tailored for firefighters.
What could go wrong
This is a small early-stage trial with only 50 participants, so results may not apply broadly. The intervention is behavioral, so success depends on individual adherence.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 50 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Apr 2026

An estimate. Start dates often move.

Expected to finish

Dec 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 60 years

Sex

Male participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Male firefighters aged 18-60 years * Currently active as volunteer or career firefighters * Body mass index (BMI) ≥30 kg/m² based on self-reported height and weight * Express interest in participating in a clinical study aimed at improving body composition (weight loss), metabolic status, and quality of life * Residing and/or working in Massachusetts, Rhode Island, or Southern New Hampshire (Boston metro area) Exclusion Criteria: * Female sex\* * BMI \<30 kg/m² based on self-reported height and weight * Active psychosis * History or diagnosis (during the RCT) of any of the following: Major cardiovascular disease event (e.g., myocardial infarction, cardiac arrest, cerebrovascular accident) Cancer (excluding non-melanoma skin cancer) Abnormal liver function (aminotransferase, bilirubin, or alkaline phosphatase ≥3× the upper limit of normal) Renal dysfunction (estimated glomerular filtration rate ≤30 mL/min/1.73 m²) * Current or recent (within 6 months) use of testosterone treatment or anti-obesity/obesogenic medications * Unwillingness to adhere to potential intervention assignments * Because this is an exploratory study, the number of subjects is limited, and men make up roughly 85% of the US fire service, the current proposal is limited to men. In future studies, we will include women firefighters.

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Conditions

The condition(s) this trial relates to.

diabetes mellitus metabolic syndrome X Obesity obesity disorder Psychological Well-Being

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Obesity and obesity-related medical conditions

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Cambridge Health Alliance

    Sommerville, Massachusetts, 02145, United States

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