Effects of Sucralose in Gut Intestinal Microbiota and Postprandial GLP-1

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

40 participants

Study Classification

INTERVENTIONAL

Study Start Date

2023-06-01

Study Completion Date

2024-03-01

Brief Summary

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Recently, it has been proposed that the consumption of non-nutritive sweeteners, including sucralose, it's not harmless and is related with metabolic effects. Some studies have reported that sucralose produces alterations in glucose homeostasis. In vitro studies indicate that sucralose can interact with sweet taste receptors (T1R2 and T1R3) in the intestine, thus increasing the expression of glucose transporters including the sodium-glucose cotransporter type 1 (SGLT1) and the glucose transporter 2 (GLUT2), increasing glucose absorption. This interaction with intestinal sweet taste receptors also generates an increase in the secretion of the incretins glucagon-like peptide type 1 (GLP-1) and the glucose-dependent insulinotropic polypeptide (GIP), which might enhance the postprandial insulin release. However, these results are preliminary and it's desirable to confirm if sucralose consumption is associated with glucose metabolism modifications using an appropriate methodological design and with gold standard methods. The aim of this triple-blind, placebo-controlled, parallel, randomized clinical trial is to confirm the changes in insulin sensitivity associated with sucralose consumption in humans, to identify whether these changes are in the liver or skeletal muscle and to investigate the pathophysiological mechanisms generating these changes. Specifically, we will investigate if sucralose generates a dysbiosis in the gut microbiota that could be related to insulin resistance by increasing concentrations of lipopolysaccharide, a toxin found in Gram-negative bacteria that triggers a low-grade inflammation known as metabolic endotoxemia. In addition, the changes in postprandial concentrations of GLP-1, glucose, insulin, and C-peptide due to the combination of sucralose with a mixed meal will be investigated. The results of this study will determine if sucralose consumption, frequently used as a non-nutritive sweetener, is associated to significant changes in glucose homeostasis in humans.

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Detailed Description

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Study design:

This is a triple-blind, parallel, placebo-controlled, randomized clinical trial.

Sample size:

The sample size was calculated to observe a difference of 20% in the Matsuda index between groups.

The calculation was done considering a probability of type I error (α) of 5%, with a power of 80% and adding an extra-20% for potential losses at follow-up.

The estimated sample size for the study is 40 subjects, 20 per group.

Randomization:

The participants will be randomly assigned to one of the two groups (sucralose or placebo) using the website Randomization.com (http://www.randomization.com) with a balanced block design of 5 blocks with 8 subjects each. The random allocation sequence will be done by an external researcher.

Intervention:

The intervention will consist of capsules filled with pure sucralose or placebo (cornstarch) accordingly to the group assignment. Each capsule will contain 90 mg of sucralose or placebo. Participants will be asked to consume one capsule in each meal (three per day) in order to achieve an ingestion of 270 mg of sucralose or placebo, this quantity corresponds approximately to the 30% of the acceptable daily intake (ADI) of sucralose for a lean person. This was calculated based on the ADI established by the joint Food and Agriculture Organization of the United Nations (FAO)/World Health Organization (WHO) expert committee on food additives (JECFA) of 15 mg per kg of body weight per day of sucralose.

The use of identical capsules will allow the blinding, the capsules will be deposited in bottles numbered sequentially according to the enrollment process and neither the participants nor the researches will know the content of the capsules or the group assigned.

Visit 1

An oral glucose tolerance test (OGTT) will be performed to confirm that participants do not have diabetes or prediabetes. Fasting insulin, lipid profile and glycated hemoglobin will be measured. Also, anthropometry (weight, height, waist, and hip circumference), blood pressure and heart rate will be documented. Body composition will be evaluated with dual X-ray absorptiometry (DXA) already available in the Research Unit and bioelectrical impedance. Physical activity will be registered with the questionnaire from the University of Laval that measure energy expenditure in Kcal per day. A format for three-day food intake record will be given to be prospectively registered by participants.

Visit 2

The three-day food record will be requested and reviewed to evaluate food consumption habits. A mixed meal tolerance test will be performed over two hours. The meal will consist of 523 kcal (49% carbohydrates, 17% protein, 34% lipids). Blood samples will be collected at 0, 30, 60, 90 and 120 minutes to measure glucose, insulin and glucagon-like peptide type 1 (GLP-1) concentrations. Also, lipopolysaccharide (LPS), C-reactive protein (CRP), interleukin 6 (IL-6), and tumor necrosis factor-alpha (TNF-α) concentrations will be measured at the basal time. Ten minutes before the test participants will consume a capsule containing either sucralose or placebo (120 mg).

Participants will proportionate the first stool sample to evaluate gut microbiota.

The researchers will proportionate the bottle with capsules that each participant will consume during the intervention period (30 ± 2 days) in this visit. Also, each participant will be asked to record on the adherence format if they consumed the capsule at breakfast, lunch, and dinner each day of the intervention period and to record any symptom related to capsules ingestion. Another format to record three-day food consumption again will be given.

Visit 3

Participants will proportionate the second stool sample to evaluate changes in gut microbiota. Also, the physical activity questionnaire will be applied again, and the second 3-day food record will be obtained to evaluate changes in physical activity and food habits, respectively. The second mixed meal tolerance test will be performed following the same procedures as visit 2. Participants will be asked to return the empty bottles to quantify adherence to the intervention. In addition, adherence and symptoms formats will be collected.

Visit 4

Participants will be asked to assist one month after visit 3 to make a final evaluation of fasting glucose, insulin, and lipid profile concentrations. The physical activity questionnaire will be applied again, and a third 3-day food record will be collected to evaluate changes in physical activity and food habits, respectively.

Conditions

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GLP-1 Gut Microbiota Insulin Resistance

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Triple blind parallel placebo-controlled randomized clinical trial

Primary Study Purpose

OTHER

Blinding Strategy

QUADRUPLE

Participants Caregivers Investigators Outcome Assessors

The use of identical capsules will allow the blinding, the capsules will be deposited in bottles numbered sequentially according to the enrollment process and neither the participants nor the researchers will know the content of the capsules, or the group assigned.

Study Groups

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Sucralose

The intervention will consist of capsules filled with pure sucralose. Each capsule will contain 90 mg of sucralose. Participants will be asked to consume one capsule in each meal (three per day) to achieve an ingestion of 270 mg of sucralose, this quantity corresponds approximately to the 30% of the acceptable daily intake (ADI) of sucralose for a lean person. This was calculated based on the ADI established by the joint FAO/WHO expert committee on food additives (JECFA) of 15 mg per kg of body weight per day of sucralose.

Group Type EXPERIMENTAL

sucralose

Intervention Type OTHER

Food additive used to replace sugar providing a sweet taste without calories.

Placebo

The intervention will consist of capsules filled with placebo (cornstarch). Each capsule will contain 90 mg of cornstarch. Participants will be asked to consume one capsule in each meal (three per day) in order to achieve an ingestion of 270 mg of placebo, this quantity is in order to match the sucralose consumed in the intervention group.

Group Type PLACEBO_COMPARATOR

placebo

Intervention Type OTHER

Cornstarch without significant physiological effects

Interventions

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sucralose

Food additive used to replace sugar providing a sweet taste without calories.

Intervention Type OTHER

placebo

Cornstarch without significant physiological effects

Intervention Type OTHER

Other Intervention Names

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non-nutritive sweetener

Eligibility Criteria

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Inclusion Criteria

* Normal BMI (18.5-24.9 kg/m2)
* Low habitual consumption of non-nutritive sweeteners (NNS
* Fasting plasma insulin concentration of \<12 mU/L

Exclusion Criteria

* Diabetes or altered glucose metabolism (abnormal fasting glucose, glucose intolerance or elevated glycated hemoglobin)
* Use of antibiotics in the last 3 months
* Use of probiotics through pharmaceutical products
* Liver or kidney disease
* Use of medications that could interfere with insulin sensitivity
* Severe intestinal diseases
* History of bariatric surgery
* Pregnancy or lactation

Minimum Eligible Age

20 Years

Maximum Eligible Age

45 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes