The Effect of Glycaemic Index Variation on Blood Glucose and Mood in Healthy Participants Across the Day

Matthew Grout24 enrolled

Overview

This study provided 24 healthy subjects with two diets that varied in their glycaemic index values. One condition was a low GI diet, whilst the other was a high GI diet. Glucose concentrations and mood were measured throughout each test day.

Therefore, the aim of this study is to feed to participants meals which differing in their glycaemic index across the course of a day, and thus produce different glycaemic responses. The outcome variables will be blood glucose levels and subjective mood. The purpose of this study is to identify the appropriate times (according to glycaemic response) at which cognitive functioning should be tested. Importantly, this study is also the first step to characterizing glycaemic and cognitive profiles associated with food consumption over a whole day (breakfast, lunch, snack) rather than just one meal (e.g. breakfast), ranging from the most favourable (stable glucose regulation) to the least favourable (variability; many peaks and troughs).

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

BASIC_SCIENCE

Masking

SINGLE

Enrollment

Conditions

Mood Diet Modification Glucose, Low Blood Glucose, High Blood

Interventions

Low Glycaemic DietDIETARY_SUPPLEMENT

This intervention consisted of three low GI meals.

High Glycaemic DietDIETARY_SUPPLEMENT

This intervention consisted of three meals, all with a high GI value.

Eligibility

Sex: ALLMin age: 18 YearsMax age: 65 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Aged between 18 and 65 years of age. * Willing to participate in the entire study (signed informed consent required) * Subjects will be eligible for the study if male or female (not pregnant or lactating) Exclusion Criteria: * Diabetic * Smoker * Have any food intolerances or allergies * History of alcohol or drug misuse * Diagnosed with any of the following: * High blood cholesterol * High blood pressure * Thyroid disorder * Heart problems, stroke or any vascular disease in the past 12 months * Inflammatory diseases such as rheumatoid arthritis * Bone related conditions, such as osteoporosis * Renal, gastrointestinal, respiratory, liver disease or cancer * You are presently taking part in another clinical trial or research study * You are an elite athlete (very high intensity training more than 3 times a week) * You are currently on a specific diet or taking any dietary supplements and are unwilling to cease during the testing period * You are intending to regularly use medication which affects gastrointestinal motility

Outcomes

Primary Outcomes

Change in Glycaemic profile across the day

Change in blood glucose concentrations (mmol/L)

Time frame: Assessed at 0 (baseline), 15, 30, 45, 60, 90, 120 mins after each meal. With 3 meals in a day this totaled 21 assessment point for each day, giving 42 assessment points to compare overall. Data will be reported for the duration of this 3 year PhD award.

Secondary Outcomes

Mood (alertness, anxiety and contentment) measured by Bond & Lader (1974) Visual Analogue Scale

The Bond \& Lader VAS provides participants with 16 lines measuring 100mm each. At the ends of each line are two words opposite in meaning. For example, 'alert' and 'drowsy'. A participants marks on the line closer to the word they currently feel. The score from each line is out of 0 to 100.

Time frame: This was measured 6 times a day (every 90 minutes starting at 0 minutes/baseline), giving a total of 12 times. Each time last approximately 5 minutes, giving a total of 60 minutes overall. Data will be reported for the duration of this 3 year PhD award.

Data from ClinicalTrials.gov

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