The RAMP Study - Rejuvenation of the Aging Microbiota With Prebiotics

Not Recruiting

Trial ID: NCT03690999


An individual's immune and metabolic status is coupled to consumed carbohydrates. Complex carbohydrates that are not digested by human enzymes may influence host biology by impacting microbiota composition and function, or act in a yet-unknown microbiota-independent manner. Prebiotics offer a promising safe route to influence host health, possibly via the microbiota. However, it remains largely unknown to what extent immune function and metabolism can be modulated by prebiotics.

Official Title

Impact of a Prebiotic Supplement on Microbiome, Immune System, and Metabolic Status of Older Adults

Stanford Investigator(s)


Inclusion Criteria:

   - 60 years old and older

   - Otherwise, healthy subjects willing and able to provide blood as well as stool

   - Must be able to provide signed and dated informed consent and be willing to follow

Exclusion Criteria:

   - Body Mass Index >= 40

   - LDL-C > 190 mg/dL

   - Systolic Blood Pressure >160 mmHg OR Diastolic Blood Pressure > 90 mmHg

   - 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

      - metformin

      - proton pump inhibitors (PPIs)

   - Regular use of any of the following medications:

      - regular dose aspirin (>81mg/day)

      - opiate pain medication

   - Use of large doses of commercial probiotics consumed (greater than or equal to 10-8
   cfu or organisms per day) - includes tablets, capsules, lozenges, chewing gum or
   powders in which probiotic is a primary component. Ordinary dietary components such as
   fermented beverages/milks, yogurts, foods do not apply.

   - Acute disease at the time of enrollment. Acute disease is defined as the presence of a
   moderate or severe illness with or without fever. Examples include flu or
   gastroenteritis. Defer sampling until subject recover.

   - Chronic, clinically significant, unstable (unresolved, requiring on-going changes to
   medical management or medication) pulmonary, cardiovascular, gastrointestinal, hepatic
   or renal functional abnormality, as determined by medical history. Type 2 diabetes,
   type 1 diabetes, and dialysis will be excluded.

   - History of active uncontrolled gastrointestinal disorders or diseases including:

      - inflammatory bowel disease (IBD) including ulcerative colitis
      (mild-moderate-severe), Crohn's disease (mild-moderate-severe), or indeterminate

      - irritable bowel syndrome (IBS) (moderate-severe);

      - persistent, infectious gastroenteritis, colitis or gastritis, persistent or
      chronic diarrhea of unknown etiology, Clostridium difficile infection (recurrent)
      or Helicobacter pylori infection (untreated).

   - History of active cancer in the past 3 years 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 excessive 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; or > 14 drinks/week.

   - Positive test for HIV, HBV or HCV.

   - Any confirmed or suspected condition/state of immunosuppression or immunodeficiency
   (primary or acquired) including HIV infection.

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

   - Regular/frequent use of smoking or chewing tobacco, e-cigarettes, cigars or other
   nicotine-containing products.

   - Any confirmed or suspected autoimmune disease. Examples include multiple sclerosis and
   Graves disease.

   - Veganism.

   - Dairy allergies.


dietary supplement: Placebo

dietary supplement: Prebiotic supplement

Not Recruiting

Contact Information

Stanford University
School of Medicine
300 Pasteur Drive
Stanford, CA 94305
Jennifer Robinson, PhD