Impact of Yogurt on Gastrointestinal Health, Regularity, and Thoughts (IYOGHRT)

This study aims to test the central hypothesis that adding to the diet daily yogurt provides beneficial effects on digestive health and subjective mood in healthy adults.

Study Overview

• Status: Completed
• Conditions: Gastrointestinal Dysfunction; Physiological Stress; Cognition - Other
• Intervention / Treatment: Dietary supplement: Yogurt with B. lactis and added cane sugar

Detailed Description

This clinical trial will include a 4-week lead-in period and a 2-week treatment period. The lead-in period will be devoid of all supplemental and dietary probiotics, fermented dairy products, and fermented foods. Participants will be asked to refrain from consuming all supplemental and dietary probiotics, fermented dairy products, and fermented foods throughout the entire study. During the treatment period, participants will be given yogurt with sugar. This trial will serve as a continuation of the NECTAR Study (NCT04187950).

• Study Type: Interventional
• Enrollment (Actual): 66
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Illinois
    • Urbana, Illinois, United States, 61801
      • University of Illinois at Urbana-Champaign

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 22 years to 64 years (Adult)
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Males and females
• Between the ages of 22-64 years at the time of consent
• Body mass index of 18.5 to 29.9 kg/m^2.
• Normal or corrected-to-normal vision based on the minimal 20/20 standard in order to complete the cognitive task (below 20/20 vision).
• Ability to drop off fecal sample within 30 minutes of defecation
• Have between 3-6 bowel movements per week
• Have completed the NECTAR Study (NCT04187950)

Exclusion Criteria:

• Current pregnancy, lactation, or post-menopausal
• Tobacco use
• Honey allergy or intolerance
• Dairy allergy, lactose intolerance
• Food dye allergy/intolerance
• Prior physician diagnosed gastrointestinal disease (chronic constipation, diarrhea, Crohn's disease, celiac disease, ulcerative colitis, irritable bowel syndrome, diverticulosis, stomach or duodenal ulcers, hepatitis, or gastroesophageal reflux disease (GERD))
• Current use or use of antibiotics in the past 3 months
• Current use of any of the following types of medications: laxatives, anti-diarrhea medications, narcotics, enemas, antispasmodics, anticonvulsants, prescription proton pump inhibitors, prokinetic agents, histamine-2 Rc antagonists (prescription GERD medication)
• Body mass index > 29.9 kg/m^2
• Prior malabsorptive bariatric surgery (i.e. gastric bypass, sleeve gastrectomy)
• Restrictive bariatric surgery (i.e. adjustable gastric band) within the past 5 years
• Concurrent enrollment in another dietary, exercise, or medication study (except for the NECTAR Study (NCT04187950))

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Yogurt with B. lactis and added cane sugar; Participants will consume yogurt with B. lactis and added cane sugar twice daily for 14 days.	Dietary supplement: Yogurt with B. lactis and added cane sugar; The intervention condition will utilize a commercially available yogurt (Activia) that contains Bifidobacterium animalis lactis DN-173 010/CNCM I-2494 (B. lactis). Participants will consume 170 g of yogurt with cane sugar twice daily for 14 days.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Intestinal transit time measured using colored dye markers	Determine the impact of consumption of daily yogurt with sugar on intestinal transit time in vivo. Intestinal transit time will be measured using colored dye markers.	2 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Digestive health measured using the Gastrointestinal Quality of Life Index (GIQLI) questionnaire	Determine the impact of consumption of daily yogurt with sugar on other measures of digestive health using the Gastrointestinal Quality of Life Index (GIQLI) questionnaire. The GIQLI assesses gastrointestinal health through a series of 36 questions pertaining to daily life and gastrointestinal symptoms experienced in the past 2 weeks.	2 weeks
Mood measured using the Emotional Image Task	Determine the impact of consumption of daily yogurt with sugar on mood states using the Emotional Image Task. This task measures response to neutral, positive, and negative image stimuli using participant valence, arousal, and dominance ratings.	2 weeks
Mood measured using the Positive and Negative Affect Schedule (PANAS) questionnaire	Determine the impact of consumption of daily yogurt with sugar on mood states using the Positive and Negative Affect Schedule (PANAS) questionnaire. The PANAS assesses general mood using a 20-item scale that includes words associated with either positive (10 words) or negative (10 words) emotions.	2 weeks
Gastrointestinal microbiota assessed using relative abundances	Determine the impact of daily consumption of yogurt with sugar on the gastrointestinal microbiota. Relative abundances of the gastrointestinal microbiota will be measured with 16S amplicon sequencing.	2 weeks
Digestive health measured using daily stool records with the Bristol Stool Scale	Determine the impact of consumption of daily yogurt with sugar on digestive health using daily stool records. Within the records, participants rate stool consistency using the Bristol Stool Scale (1=hard to 7=watery).	2 weeks
Digestive health measured using rating scales of additional symptoms in daily stool records	Determine the impact of consumption of daily yogurt with sugar on other measures of digestive health using daily stool records. Within the records, ratings of additional gastrointestinal symptoms include ease of passage (1=very easy to 5=very difficult, abdominal pain, bloating, burping, flatulence, nausea, reflux, and rumblings (1=absent to 4=severe).	2 weeks
Digestive health measured using the Gastrointestinal Tolerability questionnaire	Determine the impact of consumption of daily yogurt with sugar on other measures of digestive health using the Gastrointestinal Tolerability questionnaire. This questionnaire assesses gastrointestinal health through 6 questions related to gastrointestinal health including nausea, bloating, rumblings, gas/flatulence, abdominal pain, and diarrhea ("no more than usual" to "much more than usual"). Each of the questions pertains to experience of symptoms in the past 7 days.	2 weeks
Mood measured using the Depression, Anxiety, and Stress Scales-42 (DASS-42) questionnaire	Determine the impact of consumption of daily yogurt with sugar on mood states using the Depression, Anxiety, and Stress Scales-42 (DASS-42) questionnaire. The DASS-42 includes subscales with 42 questions regarding negative emotional states and is used to assess mental health over the past week. The rating scale for each question is 0="did not apply to me at all" to 3="applied to me very much, or most of the time." Lower scores indicate none or less symptoms of depression, anxiety, or stress.	2 weeks
Mood measured using Patient-Reported Outcomes Measurement Information System (PROMIS) questionnaires	Determine the impact of consumption of daily yogurt with sugar on mood states using Patient-Reported Outcomes Measurement Information System (PROMIS) questionnaires. Specific PROMIS surveys utilized included PROMIS SF v1.0 - Anger 8a, PROMIS SF v1.0 - Anxiety 8a, PROMIS SF v1.0 - Fatigue 8a, PROMIS SF v1.0 - Positive Affect 15a, PROMIS SF v1.0 - Self-Efficacy Manage Emotions 8a, PROMIS SF v1.0 - Fatigue 13a (FACIT-Fatigue), PROMIS SF v1.1 - Global Health, and PROMIS SF v2.0 - Cognitive Function 8a. PROMIS. Surveys were scored using the recommended HealthMeasures Scoring Service.	2 weeks
Cognitive function measured using the Spatial Reconstruction Task	Determine the impact of consumption of daily yogurt with sugar on cognitive function compared to control (yogurt containing heat-inactivated B. lactis) using the Spatial Reconstruction Task. This task requires participants to successfully encode and retrieve information pertaining to the position of six objects in relation to each other, necessitating recruitment of the hippocampal memory system.	2 weeks

Collaborators and Investigators

• Sponsor: University of Illinois at Urbana-Champaign
• Collaborators: National Honey Board

Study record dates

Study Major Dates

• Study Start (Actual): September 20, 2021
• Primary Completion (Actual): November 23, 2022
• Study Completion (Actual): November 23, 2022

Study Registration Dates

• First Submitted: May 20, 2021
• First Submitted That Met QC Criteria: May 20, 2021
• First Posted (Actual): May 25, 2021

Study Record Updates

• Last Update Posted (Actual): July 21, 2023
• Last Update Submitted That Met QC Criteria: July 18, 2023
• Last Verified: July 1, 2023

More Information

Terms related to this study

• Keywords: emotion; mood; gastrointestinal transit time
• Other Study ID Numbers: 20665

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No