This study is designed to test the hypothesis that whole-grain forms of maize meal enhance and prolong satiety post-meal consumption.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
QUADRUPLE
Enrollment
50
Cereal is in porridge form. One 350 ml bottle of water provided for the 4 hour test period 7:00-11:00 a.m.. Control dinner meal consumed the prior evening, then fast 10 hours overnight before visiting the test facility on four test days one week apart.
U. Pretoria
Pretoria, South Africa
Satiety -Appetite
Self-reported appetite ratings using a 100 mm visual analog scale (VAS) questionnaire with 3 items: desire to eat rated from very weak to very strong, hunger rated from not at all to extremely, and fullness rated from not at all to extremely.
Time frame: On each of four testing days, in fasted state, immediately after the standardised breakfast (0), and at 120 and 240 min after the breakfast
Satiety -Biomarkers: Leptin
Blood by venipuncture to measure the appetite-regulating hormone leptin in nanograms per milliliter
Time frame: On each of four test days at baseline following a 10 hour fast (Time 0), at 2 hours and 4 hours post ingestion of test porridge
Satiety -Biomarkers: Ghrelin
Blood by venipuncture to measure the appetite-regulating hormone ghrelin in picograms per milliliter
Time frame: On each of four test days at baseline following a 10 hour fast (Time 0), at 2 hours and 4 hours post ingestion of test porridge
Satiety - glycaemic parameters: Glucose
Blood samples obtained by venipuncture in millimoles per liter
Time frame: On each of four test days at baseline following a 10 hour fast (Time 0), at 2 hours and 4 hours post ingestion of test porridge
Satiety - glycaemic parameters: Insulin
Serum samples obtained by venipuncture in microunits per milliliter
Time frame: On each of four test days at baseline following a 10 hour fast (Time 0), at 2 hours and 4 hours post ingestion of test porridge
Anthropometric measurements - BMI
Body mass index calculated from kg weight and cm height
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Time frame: Test Day 1 only prior to porridge consumption
Anthropometric measurements - WHR
Waist-hip ratio in centimeters
Time frame: Test Day 1 only prior to porridge consumption
Anthropometric measurements - Fat Mass
Body composition measurement
Time frame: Test Day 1 only prior to porridge consumption
Dietary intake habits-QFFQ
Interviewer-administered, completed once using a quantified food frequency questionnaire (QFFQ) of 140 typically consumed food items by type/brand, cooking methods, frequency, and the amount of all food and drink consumed in the past 4 weeks converted to grams per week per food item
Time frame: The protocol allows for completion prior to the first test day, or instead at any one of the four test days. There is no particular time point requirement that it be done at baseline nor within a certain window after test meal consumption.
Dietary intake habits-24 hour recall
Using a quantified food frequency questionnaire (QFFQ)
Time frame: Completed at each of the four test days. There is no particular time point requirement that it be done at baseline nor within a certain window after test meal consumption.