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Healthy VolunteersBREADGINCT02297074

Evaluation of Glycemic Index, Glycemic Load and Insulinemic Index of Spanish Breads

A study testing Ordinary white bread, Precooked-Frozen White Bread and Candeal-flour White Bread in people with Healthy Volunteers, run by Organización Interprofesional Agroalimentaria de Cereales Panificables y Derivados.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The present study was carried out to determine the glycaemic index (GI), glycaemic load (GL), insulinaemic index (InI), appetite ratings and postprandial plasma concentrations of gastrointestinal hormones related to the control of food intake after the ingestion of five types of commercially available selected Spanish… Read more about this study

Who is it for?
Ages 18 to 45 yearsHealthy volunteers can take part
Conditions the study is for
Healthy Volunteers
What is being tested?
Ordinary white bread, Precooked-Frozen White Bread and Candeal-flour White Bread
Could I receive a placebo?
No, everyone receives an active treatment
How many people
22 participants
Where
No sites listed yet
Study dates
Jan 2013to Aug 2013
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 45 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • age between 18 and 45 years old
  • body mass index (BMI) between 18 and 30, normal and overweight
  • healthy
  • Accept to participate in the study

Who cannot join

  • age below 18 and more than 45 years old
  • BMI lower than 18 and more than 29
  • smokers
  • pregnancy or breastfeeding
  • unusual fibre consumption
  • glucose plasma levels higher than 110 mg/dl
Show all 11Show fewer
  • insulin plasma levels higher than 10 mU/ml
  • blood pressure higher than 110 mmHg
  • medication to treat blood pressure glucose or lipid metabolism
  • suffering from metabolic or gastrointestinal syndrome
  • genetic dyslipidemia or intake nutritional supplements in the last three months

About this study

Official title: Evaluation of Glycemic Index Glycemic Load and Insulinemic Index of Spanish Breads and Their Effect on Incretins and Gastrointestinal Hormones Related With Appetite Regulation

The present study was carried out to determine the glycaemic index (GI), glycaemic load (GL), insulinaemic index (InI), appetite ratings and postprandial plasma concentrations of gastrointestinal hormones related to the control of food intake after the ingestion of five types of commercially available selected Spanish breads. All volunteers took the breads and glucose in a crossover interventional study.

Read the detailed description

The most important cereal-derived nourishment is bread, a staple food which is the main source of daily carbohydrates. White bread is the one for which the most rapid decline has occurred, probably due to a popular belief that bread provokes weight gain, but more studies are needed to clarify the relationship between bread consumption and ponderal status in Spanish population.

A growing body of evidence supports a beneficial role for low-glycaemic index (GI) and glycaemic load (GL) diets in the prevention of life style-related diseases such as type-2 diabetes. Likewise, GI s widely used in the selection of foods suitable for glycaemic control, since low to moderate GI diets have been proposed for the prevention of type 2 diabetes, cardiovascular disease and age-related eye diseases. On the contrary, related to obesity, no associations between BMI, GI and GL have been reported in a Mediterranean population. Thus, investigations focuses on the implication of glycaemic response of different breads are of important application.

Many factors such as manufacturing bread conditions, starch structure, bread particle size and inclusion of different types of ingredients like whole-grains may influence glycaemic response and therefore may contribute to modify GI, GL and InI of breads. Comparing different French breads, GI value varied between 57 for the traditional baguette and 85 for the wholemeal loaf, while the traditional baguette exerted a significantly lowest postprandial insulin response and the lowest InI. However, to our best knowledge, neither the influence of different types of Spanish breads on GI, GL and InI nor the effects on appetite ratings and on the postprandial gastrointestinal hormone responses have been investigated.

Being tested
Ordinary white bread, Precooked-Frozen White Bread, Candeal-flour White Bread, Alfacar White Bread, Wholemeal Bread
Keywords
Bread, Glycemic index, Glycemic load, Insulinemic index, Satiety, Gastrointestinal hormones

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Ordinary white breadOther

    The evening before the test day, subjects consumed a standardised dinner. Volunteers arrived in a 12-h fasting state. A fasting blood sample was acquired after the resting time, and appetite feelings were assessed by using visual analogue The subjects were instructed to consume the tested bread or 50 g of glucose. The subjects immediately completed two VAS, one on appetite feelings and another on bread palatability. The appetite feeling VAS were repeated every 30 min until a total of 180 min had passed. The subjects were not allowed to eat or drink anything else during the 180 min of the intervention.

    After the last blood extraction (3 h), an ad libitum lunch and 300 ml of water was provided. Volunteers ate until comfortably satisfied and the amount of food intake was registered

  • Precooked-Frozen White BreadOther

    The evening before the test day, subjects consumed a standardised dinner. Volunteers arrived in a 12-h fasting state. A fasting blood sample was acquired after the resting time, and appetite feelings were assessed by using visual analogue The subjects were instructed to consume the tested bread or 50 g of glucose. The subjects immediately completed two VAS, one on appetite feelings and another on bread palatability. The appetite feeling VAS were repeated every 30 min until a total of 180 min had passed. The subjects were not allowed to eat or drink anything else during the 180 min of the intervention.

    After the last blood extraction (3 h), an ad libitum lunch and 300 ml of water was provided. Volunteers ate until comfortably satisfied and the amount of food intake was registered

  • Candeal-flour White BreadOther

    The evening before the test day, subjects consumed a standardised dinner. Volunteers arrived in a 12-h fasting state. A fasting blood sample was acquired after the resting time, and appetite feelings were assessed by using visual analogue The subjects were instructed to consume the tested bread or 50 g of glucose. The subjects immediately completed two VAS, one on appetite feelings and another on bread palatability. The appetite feeling VAS were repeated every 30 min until a total of 180 min had passed. The subjects were not allowed to eat or drink anything else during the 180 min of the intervention.

    After the last blood extraction (3 h), an ad libitum lunch and 300 ml of water was provided. Volunteers ate until comfortably satisfied and the amount of food intake was registered

  • Alfacar White BreadOther

    The evening before the test day, subjects consumed a standardised dinner. Volunteers arrived in a 12-h fasting state. A fasting blood sample was acquired after the resting time, and appetite feelings were assessed by using visual analogue The subjects were instructed to consume the tested bread or 50 g of glucose. The subjects immediately completed two VAS, one on appetite feelings and another on bread palatability. The appetite feeling VAS were repeated every 30 min until a total of 180 min had passed. The subjects were not allowed to eat or drink anything else during the 180 min of the intervention.

    After the last blood extraction (3 h), an ad libitum lunch and 300 ml of water was provided. Volunteers ate until comfortably satisfied and the amount of food intake was registered

  • Wholemeal BreadOther

    The evening before the test day, subjects consumed a standardised dinner. Volunteers arrived in a 12-h fasting state. A fasting blood sample was acquired after the resting time, and appetite feelings were assessed by using visual analogue The subjects were instructed to consume the tested bread or 50 g of glucose. The subjects immediately completed two VAS, one on appetite feelings and another on bread palatability. The appetite feeling VAS were repeated every 30 min until a total of 180 min had passed. The subjects were not allowed to eat or drink anything else during the 180 min of the intervention.

    After the last blood extraction (3 h), an ad libitum lunch and 300 ml of water was provided. Volunteers ate until comfortably satisfied and the amount of food intake was registered

  • GlucoseOther

    50 g of glucose were administered as a reference

Study groups in NCT02297074
Study groupRoleWhat they receive
Ordinary White BreadExperimentalOrdinary white bread bread is characterised by a white crumb with regular soft alveoli and a slightly soft thin crust.
Receives: Other: Ordinary white bread
Precooked-Frozen White BreadExperimentalPrecooked-Frozen white bread is characterized by white crumb with regular soft alveoli and bright crusty crust
Receives: Other: Precooked-Frozen White Bread
Candeal-flour White BreadExperimentalCandeal-flour white bread has a thick crust of between one and two millimetres, which is smooth and crisp, golden to light brown in colour and which tastes of toasted cereal. The crumb of the bread is white and its texture is smooth, spongy and consistent, with little regular alveolus and with an intense cereal aroma with a pleasant and slightly sweet taste
Receives: Other: Candeal-flour White Bread
Alfacar White BreadExperimentalAlfacar white bread is made according to its protected designation of origin and protected geographical indication (D.O. Alfacar, Granada, Spain). The bread has a creamy white, flexible and soft crumb, with many randomly scattered holes. The crust is medium-thick to thick, golden, slightly shiny and quite smooth
Receives: Other: Alfacar White Bread
Organic Wholemeal BreadExperimentalThe Organic wholemeal bread only includes organic whole grain flours as the unique difference compared with the Ordinary bread. The resulting dark brown bread is characterized by compact crumb free of alveoli and hard thin crust
Receives: Other: Wholemeal Bread
GlucoseActive comparatorGlucose is used to calculate glycemic index, glycemic load and insulinemic index
Receives: Other: Glucose

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Postprandial determination of Glycemic index and glycemic load

    Glycemic index is defined as the blood glucose response measured as AUC in response to a test food consumed by an individual under standard conditions related to the postprandial response to 50 g of oral glucose load under the same conditions.

    Glycemic load takes into account the GI of the product and how many available carbohydrates are in a food serving and is calculated as GL = [GI of product/100 x g of available carbohydrates in a food serving]

    Measured: from fasting to 180 mins after the intake of the breads

Secondary outcomes (3)
  1. Postprandial determination of Insulinemic index

    insulinemic index measures the increment of insulin AUC over two hours in response to consumption of the amount of bread providing a 50 g of available carbohydrates divided by AUC after ingestion of 50 g of glucose after two hours

    Measured: from fasting to 180 mins after the intake of the breads

  2. Postprandial determination of Appetite profile

    Appetite profile was assessed using VAS ratings of hunger, fullness, desire to eat and prospective food consumption, based on a 100-mm scale ranging from 0 ("not at all") to 100 ("extremely"). This questionnaire was completed before and every 30 min during the 240 min following the intake of the breakfast. A validated composite appetite score was calculated using the following equation: Composite appetite score = (satiety + fullness + (l00 - prospective food consumption) + (100 - hunger))/4 (Flint et al., 2000).

    Measured: from fasting to 180 mins after the intake of the breads

  3. Postprandial determination of Plasma gastrointestinal hormone concentrations

    For the determination of gastrointestinal hormone plasma concentrations, whole blood was added to peptidase inhibitor, which are needed for the determination of some hormones. This blood sample was centrifuged at 1000 x g for 10 min at 4 ºC, divided into aliquots and frozen at -80ºC for analyses. Plasma concentrations of insulin, ghrelin, GLP-1, gastric inhibitory polypeptide (GIP), peptide YY (PYY) and pancreatic polypeptide (PP) were determined using a MILLIplexTM kit (Millipore, USA).

    Measured: from fasting to 180 mins after the intake of the breads

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted21 Nov 2014 (estimated)
  2. Study startJan 2013
  3. Primary completionApr 2013
  4. Study completionAug 2013

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Basic science
Allocation
Randomised
Intervention model
Crossover
Masking
Single blind
Who is masked
Investigator
Enrolment
22 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT02297074
Sponsor's protocol ID
BreadGI
Acronym
BREADGI
Status last verified
Nov 2014
First submitted
31 Oct 2014
Last updated
21 Nov 2014
Results posted
No
Data monitoring committee
No

Publications

  • Barclay AW, Petocz P, McMillan-Price J, Flood VM, Prvan T, Mitchell P, Brand-Miller JC. Glycemic index, glycemic load, and chronic disease risk--a meta-analysis of observational studies. Am J Clin Nutr. 2008 Mar;87(3):627-37. doi: 10.1093/ajcn/87.3.627.

    PubMed 18326601
  • Blundell J, de Graaf C, Hulshof T, Jebb S, Livingstone B, Lluch A, Mela D, Salah S, Schuring E, van der Knaap H, Westerterp M. Appetite control: methodological aspects of the evaluation of foods. Obes Rev. 2010 Mar;11(3):251-70. doi: 10.1111/j.1467-789X.2010.00714.x. Epub 2010 Jan 29.

    PubMed 20122136

Questions about this trial

What is this clinical trial studying?

A study testing Ordinary white bread, Precooked-Frozen White Bread and Candeal-flour White Bread in people with Healthy Volunteers, run by Organización Interprofesional Agroalimentaria de Cereales Panificables y Derivados.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 4 inclusion and 11 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 21 Nov 2014. Status can change between updates, so confirm with the study contact before making plans.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Postprandial determination of Glycemic index and glycemic load (time frame: from fasting to 180 mins after the intake of the breads). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT02297074, which also lists 2 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Nov 2014.

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