Effects of Time-restricted Eating on Nutrient Absorption in Healthy Adults
Studie Overzicht
Toestand
Conditie
Interventie / Behandeling
Gedetailleerde beschrijving
The obesity epidemic is well documented, and despite a complex etiology influenced by genetic, physiological, psychological, social, behavioral, and environmental factors, obesity seems to be the result of energy imbalance, where energy intake exceeds energy expenditure, regardless of the internal and external influences. Studies aiming to quantify and manipulate modulators of energy balance, including gastrointestinal (GI) energy absorption rates (i.e., digestibility), are crucial for reducing the incidence of overweight and obesity and improving overall human health. Despite considerable interindividual variability in the amount of ingested energy that is absorbed (~87-98% of ingested energy) by the gastrointestinal tract, generalized equations are used to calculate individual energy intake requirements, and the factors that contribute to such variability, including meal-timing, are largely unknown.
The proposed study seeks to determine the effects of restricting the eating window to 6-h (early time-restricted eating) as compared to a control eating window of 12 h on energy and macronutrient digestibility, thermic effect of food (TEF), postprandial blood metabolites (triglyceride, insulin, glucose, fructose, galactose, inositol, and sorbitol), 24 h glucose concentrations and glycemic variability, intestinal hydrogen gas production, microbiome composition, and gastrointestinal transit time in response to a controlled, energy balanced diet. In addition, this project will determine whether energy digestibility can be predicted from biological and physiological factors such as gut microbiota composition, gastrointestinal transit time, 24-h glucose concentrations, and postabsorptive and postprandial metabolomic profiles.
Participants will be randomized to early TRE (6-h feeding window, 8am-2pm) or a control eating schedule (12-h feeding window, 8am-8pm) and consume a controlled, energy balance diet (breakfast, lunch, dinner, snacks, and beverages) for 9 consecutive days before crossing over to the other intervention after at least a 3-wk washout for females (to control for hormonal fluctuations) and at least a 2-wk washout for males. Participants will collect stool and urine during each feeding phase. Gross energy content (heat combustion by bomb calorimetry) of the diet, stool, and urine samples will be used to calculate energy digestibility (diet gross energy - stool gross energy) and metabolizable energy. Factors that may mediate and/or predict energy digestibility efficiency, including gastrointestinal microbial composition, transit time, and gas production, fasting and postprandial metabolites, continuous glucose concentrations, and thermogenesis will be assessed.
Studietype
Inschrijving (Werkelijk)
Fase
- Niet toepasbaar
Contacten en locaties
Studie Locaties
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Florida
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Tallahassee, Florida, Verenigde Staten, 32306
- Florida State University
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Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
Accepteert gezonde vrijwilligers
Geslachten die in aanmerking komen voor studie
Beschrijving
Inclusion Criteria:
- 20-45 years old
- Normal weight or overweight (18.5 to 29.9 kg/m2)
- Not taking any probiotics for 4 weeks prior to and throughout the entire study
- Willing to refrain from smoking, vaping, chewing tobacco, and dietary supplement use throughout the study
- Willing to consume a controlled diet for 9 consecutive days on 2 different occasions (18 days total) and collect all urine and fecal output for 3-5 days during each occasion
- Pass the blue dye gastrointestinal tracer (given at screening) within 72 hours of administration
Exclusion Criteria:
- Metabolic or cardiovascular abnormalities, gastrointestinal disorders, prior bariatric surgery, malabsorption, or any condition that interferes with metabolism (e.g., kidney disease, diabetes, cardiovascular disease, etc.)
- Suspected or known strictures, fistulas, or physiological/mechanical gastrointestinal obstruction
- Present condition of alcoholism, anabolic steroids, or other substance abuse issues
- Women who are pregnant, lactating, planning to become pregnant, or who have an irregular menstrual cycle in the past 6 months
- Weight fluctuations ± 5% of body weight in the last 6 months
- Allergies or intolerance to foods included in the controlled diet
- Any use of antibiotics, except topical antibiotics, within 3 months of study participation
- Colonoscopy within 3 months of study participation
- Use of laxatives, stool softeners, or anti-diarrheal medications more than once a week within 4-weeks of study enrollment
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Fundamentele wetenschap
- Toewijzing: Gerandomiseerd
- Interventioneel model: Crossover-opdracht
- Masker: Geen (open label)
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
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Experimenteel: early time-restricted eating (eTRE)
Participants will be provided a weight-maintenance diet for 9 consecutive days and will consume all meals and snacks in a 6-h window in the morning hours (e.g., 8:00 AM - 2:00 PM)
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A diet meeting the participant's weight maintenance energy needs will be provided.
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Experimenteel: control eating schedule (CON)
Participants will be provided a weight-maintenance diet for 9 consecutive days and will consume all meals and snacks in a 12-h window in the morning hours (e.g., 8:00 AM - 8:00 PM)
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A diet meeting the participant's weight maintenance energy needs will be provided.
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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
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Energy digestibility
Tijdsspanne: Days 4-9
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Calculated as gross energy of the diet (kcals) - gross energy excreted in stool (kcals)
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Days 4-9
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Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
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Fat digestibility
Tijdsspanne: Days 4-9
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Calculated as fat content of the diet - fat content excreted in stool
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Days 4-9
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Carbohydrate digestibility
Tijdsspanne: Days 4-9
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Calculated as carbohydrate content of the diet - carbohydrate content excreted in stool
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Days 4-9
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Protein digestibility
Tijdsspanne: Days 4-9
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Calculated as protein content of the diet - protein content excreted in stool
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Days 4-9
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Metabolizable energy
Tijdsspanne: Days 4-9
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Calculated as gross energy of the diet (kcals) - gross energy excreted in urine and stool (kcals)
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Days 4-9
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Metabolizable protein
Tijdsspanne: Days 4-9
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Calculated as protein content of the diet - protein excreted in urine and stool
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Days 4-9
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Postabsorptive and postprandial plasma metabolites
Tijdsspanne: Day 6
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Plasma metabolites will be measured using gas chromatography coupled with mass spectrometry in the postabsorptive state and following a standardized meal (1 hour, 2 hours, 3 hours, and 4 hours after meal intake).
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Day 6
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Gut microbiome
Tijdsspanne: Day 6
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Microbiota composition and diversity will be determined using 16S rRNA gene sequencing.
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Day 6
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Gastrointestinal transit time
Tijdsspanne: Day 6
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A gas-sensing capsule will be ingested to measure transit time in the gastrointestinal tract.
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Day 6
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Gastrointestinal gas production
Tijdsspanne: Day 6
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A gas-sensing capsule will be ingested to measure hydrogen, carbon dioxide, and oxygen production in the gastrointestinal tract.
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Day 6
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Gastrointestinal temperature
Tijdsspanne: Day 6
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A gas-sensing capsule will be ingested to measure temperature in the gastrointestinal tract.
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Day 6
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24-h glucose concentrations
Tijdsspanne: Days 1-8
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A continuous glucose monitor will be used to collect and assess 24-h glucose concentrations.
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Days 1-8
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24-h glucose variability
Tijdsspanne: Days 1-8
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A continuous glucose monitor will be used to collect and assess 24-h glucose variability.
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Days 1-8
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Thermic effect of food
Tijdsspanne: Day 6
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Indirect calorimetry measures will be collected in the resting state and for 4 hours (15-30, 45-60, 75-90, 105-120, 165-180, and 225-240 minutes) following the consumption of a standardized meal.
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Day 6
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Medewerkers en onderzoekers
Sponsor
Onderzoekers
- Hoofdonderzoeker: Claire E Berryman, Ph.D., Florida State University
Studie record data
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Meer informatie
Termen gerelateerd aan deze studie
Trefwoorden
Andere studie-ID-nummers
- STUDY00001564
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