The Effect of Bitter, Umami and Sweet Tastants on Food Intake

Maastricht University Medical Centre (MUMC)

Status: Completed

Conditions: Obesity

Treatments: Dietary Supplement: sweet; Dietary Supplement: umami; Dietary Supplement: bitter

Study type: Interventional

Funder types: Other

Identifiers

NCT01956838

NL44428.068.13/METC 13-2-025

Details and patient eligibility

About

Rationale: The appearance of tastants in the small intestine can result in the activation of a negative feedback mechanism from different parts of the intestine to the stomach, the small intestine and to the central nervous system. These processes inhibit food processing, appetite sensations and food intake, and furthermore they increase feelings of satiety and satiation. We will investigate the effects of intraduodenal infusion of quinine 75mg (bitter), rebaudioside A 540mg (sweet), monosodium glutamate 2g (umami), a combination of these tastants (quinine, rebaudioside A, monosodium glutamate) and placebo (5 test days in total) on ad libitum food intake, satiation and in vivo release of the gut satiety peptides CCK and GLP-1.

Study design: To assess the effect of intraduodenal infusion of single ingredients and a combination of tastants (bitter, umami and sweet) on ad libitum food intake.

Secondary Objective(s):

1. To investigate the effect of intraduodenal delivery of a combination of tastants on satiation.
2. To assess the effect of intraduodenal delivery of a combination of tastants on gastrointestinal hormone release.
3. To assess the effects of the tastants quinine, rebaudioside A and monosodium glutamate on the parameters as mentioned under the primary objective, and under secondary objectives 1 and 2.
4. To compare the effects, as mentioned under the primary objective, and under secondary objectives 1 and 2, of the combination of tastants to those of the three single tastants quinine, rebaudioside A and monosodium glutamate.

Enrollment: 15 patients

Sex: All

Ages: 18 to 65 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Based on medical history and previous examination, no gastrointestinal complaints can be defined.
• Age between 18 and 65 years. This study will include healthy adult subjects (male and female). Women must be taking contraceptives.
• BMI between 18 and 25 kg/m2)
• Weight stable over at least the last 6 months

Exclusion criteria

• History of severe cardiovascular, respiratory, urogenital, gastrointestinal/ hepatic, hematological/immunologic, HEENT (head, ears, eyes, nose, throat), dermatological/connective tissue, musculoskeletal, metabolic/nutritional, endocrine, neurological/psychiatric diseases, allergy, major surgery and/or laboratory assessments which might limit participation in or completion of the study protocol. The severity of the disease (major interference with the execution of the experiment or potential influence on the study outcomes) will be decided by the principal investigator.
• Use of medication, including vitamin supplementation, except oral contraceptives, within 14 days prior to testing
• Administration of investigational drugs or participation in any scientific intervention study which may interfere with this study (to be decided by the principle investigator), in the 180 days prior to the study
• Major abdominal surgery interfering with gastrointestinal function (uncomplicated appendectomy, cholecystectomy and hysterectomy allowed, and other surgery upon judgement of the principle investigator)
• Dieting (medically prescribed, vegetarian, diabetic, macrobiological, biological dynamic)
• Pregnancy, lactation
• Excessive alcohol consumption (>20 alcoholic consumptions per week)
• Smoking
• Blood donation within 3 months before the study period
• Self-admitted HIV-positive state
• Weight <60kg
• Non-tasters of sweet, bitter or umami
• Evidence of MSG-hypersensitivity or Chinese restaurant syndrome

Trial design

Primary purpose: Basic Science

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Single Blind

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15 participants in 5 patient groups, including a placebo group

Umami

Experimental group

Description:

intraduodenal infusion of umami

Treatment:

Dietary Supplement: umami

sweet

Experimental group

Description:

intraduodenal infusion of sweet tastant

Treatment:

Dietary Supplement: sweet

bitter

Experimental group

Description:

intraduodenal infusion of bitter tastant

Treatment:

Dietary Supplement: bitter

combination

Experimental group

Description:

intraduodenal infusion of a combination of tastants (umami, bitter and sweet)

Treatment:

Dietary Supplement: bitter

Dietary Supplement: sweet

Dietary Supplement: umami

placebo

Placebo Comparator group

Description:

intraduodenal infusion of placebo (tap water)