Exploring the Effects of Varying Fat:Carbohydrate Diet Permutations on Gastric Emptying and Metabolic Status Using Human Postprandial Model

Study Overview
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Brief Summary
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The aim of this clinical trial is to investigate the effects of the meals moderated by fat and carbohydrate (CHO) quality along with varying macronutrient distribution (CHO: fat) on gut physiology and metabolic outcomes using the human postprandial model with healthy subjects. The main question[s] it aims to answer are: How does meal composition with different polyunsaturated/saturated (P/S) ratio, glycemic index and macronutrient quantity affect lipemia and glycemia? How does meal composition with different P/S ratio, Glycemic index and macronutrient quantity affect gastric emptying?

Detailed Description
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The study's objectives will be tested via a randomized, crossover study with 16 diet rotations separated by minimum one week washout period. All recruited subjects will be randomly assigned into 2 groups of 7 each namely HGI and LGI with 9 diet rotations within each group. The study design will be a cross-over trial with the same subjects undergoing all arms of the diet rotations. The subjects will be blinded to the test fats used for each rotation. Body weight measurements will be recorded before each postprandial challenge to minimise weight fluctuations between the test rotations. Study procedures Oral glucose tolerance test (OGTT) Sessions Prior and end of the test meal rotations, subjects will undergo oral glucose tolerance test (OGTT) with a glucose reference drink at 2 random sessions without MRI investigation at Taylor's University or Hospital Cancelor Tuanku Muhriz (HCTM), to get an average value for the plasma glucose and insulin standards for each subject. The glucose reference drink composition will be 50g of anhydrous glucose mixed with 250mL of room temperature water. Blood samples will be collected sequentially at 0, 15, 30, 60, 90,120 and 180 minutes. Test meal sessions During each postprandial test meal rotations, subjects will consume test meals followed by MRI scans at the MRI center at Hospital Cancelor Tuanku Muhriz(HCTM). For scheduled session, Subjects will be advised to refrain from strenuous physical activity, high calorie or fast-food, supplements and coffee intake for 24 hours preceding each postprandial event. Subjects will be at the clinical center at 7:30 and 8:30a.m, following a 12-hour overnight fast. Upon arrival at the centre,subjects will rest for 10min, followed by body weight, blood pressure and self-monitoring of blood glucose (SBMG) measurements. Subsequently, blood samples will be drawn for metabolic investigations as per study objectives. Sequential postprandial MRI scans before and after test meal intake at 0(fasting), 15, 30, 60, 90, 120, 180, 240 and 300 minutes.

Official Title
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Exploring the Effects of Varying Fat:Carbohydrate Diet Permutations on Gastric Emptying and Metabolic Status Using Human Postprandial Model

Conditions
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Postprandial Lipemia, Postprandial Glycemia, Gastric Emptying

Intervention / Treatment
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* Other: HGI+palm olein
* Other: LGI+palm olein
* Other: HGI+soy bean oil
* Other: LGI+soy bean oil


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy subjects, (n=12-14) without history of chronic disease(s) with body mass index (BMI) between 18.5-25.0 kg/m2 and normal fasting blood glucose status [<5.4 mmol/L] will be enrolled into the study. Exclusion Criteria: Using pharmacotherapy that interferes with lipid and glucose metabolism or gastrointestinal transit (constipating drugs) or on oral contraceptives (women). Underweight body mass index (BMI): < 18.5 kg/m2 With medical history of cardiovascular disease (CVD), Diabetes Mellitus, dyslipidemia and other chronic diseases, acute or chronic gastrointestinal illness If vulnerable to claustrophobia or anxiety Regular alcohol usage On low-calorie diets Smoking

Ages Eligible for Study
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Minimum Age: 21 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: HGI+palm olein<br>1 portion of HGI(high glycemic index) fried rice, fried with palm olein will be served together with 250 milliliter of plain water. | Other: HGI+palm olein<br>* A 5-hour postprandial feeding intervention with 1-weeks washout in between. Blood samples will be collected at 0 hour (baseline) and up to 5 hours after consumption of test meal.<br>|
| Experimental: HGI+soy bean oil<br>1 portion of HGI (high glycemic index) fried rice, fried with soybean oil will be served together with 250 milliliter of plain water. | Other: HGI+soy bean oil<br>* A 5-hour postprandial feeding intervention with 1-weeks washout in between. Blood samples will be collected at 0 hour (baseline) and up to 5 hours after consumption of test meal.<br>|
| Experimental: LGI+palm olein<br>1 portion of LGI (low glycemic index) fried rice, fried with palm olein will be served together with 250 milliliter of plain water. | Other: LGI+palm olein<br>* A 5-hour postprandial feeding intervention with 1-weeks washout in between. Blood samples will be collected at 0 hour (baseline) and up to 5 hours after consumption of test meal.<br>|
| Experimental: LGI+soy bean oil<br>1 portion of LGI (low glycemic index) fried rice, fried with soybean oil will be served together with 250 milliliter of plain water. | Other: LGI+soy bean oil<br>* A 5-hour postprandial feeding intervention with 1-weeks washout in between. Blood samples will be collected at 0 hour (baseline) and up to 5 hours after consumption of test meal.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Lipemia | To determine the postprandial changes in triacylglyceride (TAG) | 0, 15, 30, 60, 90, 120, 180, 240, 300minutes after ingestion of test meals | 
| Glycemia | To determine the postprandial changes of glucose | 0, 15, 30, 60, 90, 120, 180, 240, 300minutes after ingestion of test meals | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Gastric emptying | To determine the postprandial changes in half emptying time | 0, 15, 30, 60, 90, 120, 180, 240, 300minutes after ingestion of test meals | 
| Gut hormone | To determine the postprandial changes of glucose-dependent insulinotropic polypeptide (GIP) | 0, 15, 30, 60, 90, 120, 180, 240, 300minutes after ingestion of test meals | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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meal composition, P/S ratio, macronutrient distribution, glycemic index, glycemia, lipemia, gut hormones, gastric emptying