Fiber Effectively Educates & Directs the Microbiome Study
Completed · Not applicable
Conditions studied: Microbial Colonization
In brief
The FEEDMe Study is a single-group, open label pilot study exploring how diverse, commercially available foods rich in arabinose influence the gut microbiome in adults from diverse populations.
Key facts
- Study ID
- NCT06395324
- Run by
- University of California, Davis
- People needed
- 48
- Starts
- 2024-08-21
- Expected to finish
- 2025-06-09
- Last updated by the study team
- 2025-08-27
Who can join
Age: 18 and older, up to 50. Sex: any. Healthy volunteers: accepted.
You may qualify if…
- Healthy adults;
- Age 18-50 years of age;
- BMI between 18.5 and 34.9 kg/m2;
- Lives within a 40-mile radius from the UC Davis campus in Davis or UCDMC in - Sacramento, CA or study personnel residences;
- Consumes food at least three times (meals/snacks) per day;
- Non-alcohol consumers or those who consume alcohol in moderation defined as having up to 1 drink per day for women and up to 2 drinks per day for men;
- Normal stool frequency defined as 3 times per week to 3 times per day;
- Has been weight-stable (has not lost or gained 10% of body weight) within the past 3 months;
- Speaks, writes, and understands English to complete study activities;
- Lives in a household whereby stool samples and study food can be reliably stored without interference from other household members (i.e., excluding individuals who reside in fraternity, sorority houses whereby freezer access is open to all members);
- Lives in a household with access to Wi-Fi and/or cellular access to enable completion of electronic questionnaires (i.e., PIP forms) on their own personal computer, cell phone, or electronic device;
- Willingness to consume study-provided foods for 18 consecutive days;
- Willingness to fill out a short online survey about the amount of each study food they consumed during the two-week intervention;
- Willingness to collect stool samples on three separate days and store them in their home freezer before they (or study personnel) transport them to UC Davis;
- Willingness to complete online weekly health questionnaires;
- Willingness to complete two online enrollment questionnaires about diet and health history;
- Willingness to complete Daily Stool Logs (7 consecutive days) at 3 separate times during the study period;
- Willingness to complete two 24-hour dietary recalls by video call with study personnel (prior to each of the 3 stool collections required for the study);
- Willingness to have four in-person visits (at their homes or on campus);
- Willingness to use their personal computer, cell phone, or electronic device to meet virtually with study personnel;
- Willingness to refrain from consuming fermented foods, or foods with probiotics or probiotic supplements and other foods listed on the study materials (confounding variables of the intestinal microbiome) during the study period;
- Willingness to refrain from consuming iron containing dietary supplements (multi-vitamin is permitted) and fiber supplements during the study period;
- Willingness to refrain from changing (starting a new or discontinuing a current) routine vitamin/mineral supplement regimen during the study period;
- Willingness to refrain from changing (starting a new or discontinuing a current) routine medication regimen during the study period;
- Willingness to refrain from consuming laxatives during the study period;
You may not qualify if…
- Currently pregnant or plans to become pregnant several weeks prior to enrollment and during the study period;
- Currently lactating;
- Use of restrictive diets such as caloric restriction, intermittent fasting, keto-diet, gluten-free, grain-free, dairy-free within the past 6 months;
- Known or suspected allergy (childhood allergies pre-puberty is acceptable) to milk, egg, wheat, legumes including soybeans; peanuts, tree nuts and seeds, and any fruits and vegetables used in the study;
- Known or suspected sensitivity or intolerances to any foods and ingredients used in the study (e.g., lactose intolerance, etc.) such as milk, egg, wheat, legumes including soybeans, peanuts, tree nuts and seeds and any fruits and vegetables used in the study;
- Aversions to or avoidance in eating foods and ingredients used in the study (legumes/beans, fruits, vegetables, peanuts, tree nuts and seeds);
- History of any type of eating disorder (anorexia nervosa, bulimia, etc.);
- History of any of the following: Positive infection of HIV, AIDS, hepatitis B or C; GI tract abnormalities; Any type of bariatric surgery or other gastric surgery involving the removal of sections of the GI tract (appendectomy or hernia repairs are acceptable), or gall-bladder removal; GI-related conditions such as malabsorption disease, celiac disease, Crohn's disease, colitis, inflammatory bowel disease (IBD), irritable bowel syndrome (IBS); Cancer (history of skin cancer that is in remission is acceptable), heart, liver, lung, endocrine, or kidney diseases; Type 1 or 2 diabetes mellitus; Cushing syndrome; Primary immune deficiency or autoimmune diseases; Uncontrolled hyper or hypothyroidism; uncontrolled hypertension (controlled with medication is acceptable);
- History of stomach ulcers or diagnosis with H. pylori infection; chronic gastritis within the past 12 months;
- Gastroenteritis (caused by stomach flu or food poisoning caused by virus or bacteria) within the past 4 weeks;
- Have any medical or nutritional conditions that require iron supplementation;
- Intake of iron supplements (stand-alone doses that are not part of a multi-vitamin) within the past 4 weeks;
- Positive test for COVID-19 based on a rapid test or PCR within the past 2 weeks;
- Use of oral, intramuscular or IV antibiotics or sulfonamides within the past 3 months;
- Vaccinations received less than the past 2 weeks (may enroll two weeks following treatment with vaccinations);
- Use of biologics that suppress the immune system, i.e., Lantus, Remicade, Rituxan, Humira, Herceptin, Avastin, Lucentis, Enbrel, for 2 weeks or longer or within the past 4 weeks;
- Use of injectable (or pill) weight loss medications or biologics such as Ozempic, Wegovy, Rybelsus, etc. within the past 4 weeks;
- Surgery or an invasive medical procedure within the past 3 months;
- Plan to have any elective surgeries including dental surgery or invasive medical procedures during the study period;
- Illness (flu, cold, etc.) within the past 2 weeks (free of all illness symptoms within the past 2 weeks);
- Routine use of medications found to alter the gut microbiome such as: Tylenol, aspirin, naproxen sodium or ibuprofen (except for acute uses with sickness or injury), anticholinergic inhalers, opioids, proton pump inhibitors, gastric acid suppressors (e.g., pepcid), metformin, statins, steroids (oral-inhaler is acceptable), 6-Marcaptopurine, Azathioprine or any other immunosuppressants on a daily basis within the past 6 months;
- Plans to start or plans to have changes made to a dose (including starting or adjusting an existing dose) of selective serotonin reuptake inhibitors (SSRIs), or antipsychotics during the study period;
- Plans to start or plans to have changes made to a dietary supplement regimen (vitamins/minerals/herbal supplements) or a medication regimen during the study period;
- Persistent (lasts longer than 2 weeks and less than 4 weeks) or chronic (lasts at least 4 weeks) diarrhea (loose, watery stools three or more times a day) within the past 6 months;
- Chronic constipation (fewer than 3 stools per week, stool form that is mostly hard or lumpy and difficult stool passage (need to strain or incomplete evacuation) with the past 3 months;
Where it is running
- University of California — Davis, California, United States
Full record on ClinicalTrials.gov
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