Metabolic Syndrome, Microbiome, Immune Function, Inflammation
Conditions
Brief summary
The primary objective is to contrast the degree to which increased consumption of dietary fiber vs. fermented food can decrease inflammation, increase microbiota diversity and can impact microbiota production of short-chain fatty acids (SCFA), potential normalizers of metabolic and immune dysfunction, in obese and non-obese adults.
Detailed description
The gut microbiota is central to human health, and the modern, industrialized gut microbiota has been linked to numerous chronic diseases that are driven by inflammation. It is likely dietary changes in the last half-century consistent with adoption of the Western diet have had an adverse impact on the gut microbiota. A critically important next step in this field of research is to identify how different dietary interventions can potentially restore healthy features of the gut microbiota in alignment with the optimization of human health. Dietary interventions that target the microbiota and reduce inflammation may reverse or prevent chronic diseases including obesity, metabolic syndrome, and inflammatory bowel disease. This study is designed to elicit and contrast inflammatory markers in blood with the amount of increase in microbiota diversity and related metabolic output achievable by two dietary approaches commonly available to the general population. The results could contribute to dietary recommendations for reversing the chronic disease epidemics of Westernization.
Interventions
BEHAVIORALDietary Fiber
BEHAVIORALFermented Foods
Sponsors
Stanford University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
SINGLE (Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* 18 and older, both genders, all ethnic backgrounds * Healthy subjects willing and able to provide blood, as well as stool specimens * Able to provide signed and dated informed consent.
Exclusion criteria
* Body Mass Index higher than 40. * Vital signs outside of acceptable range at Screening Visit, i.e., blood pressure greater than 160/100, oral temperature greater than 100 degrees F, pulse greater than 100. * Use of any of the following drugs within the last 6 months: 1. systemic antibiotics, antifungals, antivirals or antiparasitics (intravenous, intramuscular, or oral); 2. oral, intravenous, intramuscular, nasal or inhaled corticosteroids; 3. cytokines; 4. methotrexate or immunosuppressive cytotoxic agents; 5. large doses of commercial probiotics consumed (greater than or equal to 10e8 cfu or organisms per day) - includes tablets, capsules, lozenges, chewing gum or powders in which probiotic is a primary component. 6. consumption of \> 20 g fiber/day and \> 7 servings of fermented foods per week. * Acute disease at the time of enrollment (defer sampling until subject recovers). Acute disease is defined as the presence of a moderate or severe illness with or without fever. * Chronic, clinically significant (unresolved, requiring on-going medical management or medication) pulmonary, cardiovascular, gastrointestinal, hepatic or renal functional abnormality, as determined by medical history or physical examination. * History of cancer except for squamous or basal cell carcinomas of the skin that have been medically managed by local excision. * Unstable dietary history as defined by major changes in diet during the previous month, where the subject has eliminated or significantly increased a major food group in the diet. * Recent history of chronic alcohol consumption defined as more than five 1.5-ounce servings of 80 proof distilled spirits, five 12-ounce servings of beer or five 5-ounce servings of wine per day. * Positive test for HIV, HBV or HCV. * Any confirmed or suspected condition/state of immunosuppression or immunodeficiency ( primary or acquired) including HIV infection. * Major surgery of the GI tract, with the exception of cholecystectomy and appendectomy, in the past five years. Any major bowel resection at any time. * History of active uncontrolled gastrointestinal disorders or diseases including: 1. inflammatory bowel disease (IBD) including ulcerative colitis (mild-moderate-severe), Crohn's disease (mild-moderate-severe), or indeterminate colitis; 2. irritable bowel syndrome (IBS) (moderate-severe); 3. persistent, infectious gastroenteritis, colitis or gastritis, persistent or chronic diarrhea of unknown etiology, Clostridium difficile infection (recurrent) or Helicobacter pylori infection (untreated); 4. chronic constipation. Female who is pregnant or lactating.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Immune profile: Cytokine Response Score (CRS) | Baseline and 10 weeks | Change from baseline in CRS at 10 weeks |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Microbiota metabolites: short-chain fatty acids (SCFA) | Baseline and 10 weeks | Change from baseline in short-chain fatty acids (SCFA) at 10 weeks. |
| Microbiota composition | Baseline and 10 weeks | Change from baseline in 16S rRNA enumeration at 10 weeks, determined using Illumina-based sequencing. |
Countries
United States
Outcome results
None listed