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Scientists hunt for diet clues in blood and urine

NCT ID NCT06656338

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
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 looked for substances in blood and urine that can show what a person has eaten, instead of relying on memory or food diaries. Thirty-two healthy adults ate specially prepared meals for a week, and researchers tested their blood, urine, and stool samples. The goal was to find better ways to measure diet, not to treat any disease.

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

32 people

The number who actually took part.

Started

Mar 2025

Finished

Feb 2026

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 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * Healthy adults; * Age 18 years or older; * Willing to come to the Fred Hutch campus 10 times during the study; BMI 18.5-39.9 kg/m2 Exclusion criteria: * Pregnancy or lactation; * allergy or aversion to any of the foods that will be studied and/or provided; * history of gastrointestinal disorders including ulcerative colitis, Crohn's disease, celiac sprue, hereditary non-polyposis colorectal cancer (HNPCC), familial adenomatous polyposis, pancreatic disease, or liver disease; * previous gastrointestinal resection or bariatric surgery; * bleeding disorders that precludes blood draws; * recent hospital admissions (past 6 months) for heart disease (MI/CVA or CHF) or other CVD/CAD conditions under physician guided therapy that is not medically stable; * cancer under radiation or chemotherapy treatment that is active or within 6 months of treatment; * weight change (±5% in the last 3 months); * regular alcohol intake of \> 2 drinks/day (equivalent to 720 mL of beer, 240 mL of wine, or 90 mL of spirits), and unwilling to abstain during feeding periods; * use of tobacco and/or marijuana, hookahs, e-cigarettes (e-cigs, vapes, etc) and not willing to abstain during feeding periods; * use of illicit drugs and not willing to abstain during feeding periods; * BMI ≥40 kg/m2; regular (daily to weekly) use of over-the-counter (OTC) weight-loss aids or anti-inflammatories, and unwilling or unable to stop taking these during feeding periods; * unwilling to stop taking OTC dietary supplements that interfere with the test foods being studied including pills, chewables, liquids or powders for the following: protein supplements, soy, fiber, flaxseed, fish oil (including cod liver oil), probiotics, carotenoids, selenium, other antioxidants, other phytochemicals, glucosamine and chondroitin (if vitamin supplement is MD prescribed - may continue); * oral or IV antibiotic use in the past 6 months (could defer participation until 6 months post-completion of course of antibiotics); * seated blood pressure \>140/90 mmHg; fasting clinical lab tests outside acceptable values as ascertained at the screening blood draw (see Table 2 in protocol document); * current use of specific prescription medication(s) (see Table 3 in protocol document); and * inability to freely give informed consent.

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As listed by the trial registrant

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

Contacts and locations

Locations

  • Fred Hutchinson Cancer Center

    Seattle, Washington, 98109, United States

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