An investigation into whether the way potato is prepared, and what it is eaten with, affects the blood glucose response to its consumption, in people with type 2 diabetes
| ISRCTN | ISRCTN67897032 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN67897032 |
| ClinicalTrials.gov (NCT) | Nil known |
| Clinical Trials Information System (CTIS) | Nil known |
| Integrated Research Application System (IRAS) | 291203 |
| Protocol serial number | CPMS 49430, IRAS 291203 |
| Sponsor | University of Surrey |
| Funder | Alliance for Potato Research & Education |
- Submission date
- 26/07/2021
- Registration date
- 12/08/2021
- Last edited
- 29/05/2024
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Nutritional, Metabolic, Endocrine
Plain English summary of protocol
Background and study aims
There is existing data that demonstrates that the way potato is prepared and cooked affects the blood glucose response to its consumption, but none of this work has been undertaken in type 2 diabetes (T2D). It has been argued that work in healthy individuals can simply be “translated directly” into other patient groups, however, the blood glucose response to a food is affected by insulin sensitivity, gastrointestinal motility, gut hormone response and the absorption rate of glucose. All of these factors are likely to be different in T2D. Typically potatoes are not eaten in isolation but as part of mixed meals containing both fat and protein which can also affect the glucose response. This study aims to investigate not just the glucose response to different potato preparations eaten in normal quantities, but also in normal food patterns, in a group of people with type 2 diabetes.
Who can participate?
Males and females, aged 18-70 years, with a diagnosis of type 2 diabetes longer than 6 months.
What does the study involve?
Participants will be required to attend 12 study sessions. Each session will involve eating a potato-based meal and providing finger-prick blood samples for the next 3 hours (9 samples per visit). Each visit will be separated by at least two days.
What are the possible benefits and risks of participating?
The main benefit to the participant is that they will be provided with their own personal results at the end of the study, so they can see how their own blood glucose response varies with the different cooking methods. This will allow them to amend their own cooking practises at home in order to better control their blood glucose. There is a risk of slight bruising and discomfort to the fingertips, due to the sampling method, however this usually resolves within a day and can be minimised by correct sampling technique.
Where is the study run from?
University of Surrey (UK)
When is the study starting and how long is it expected to run for?
August 2019 to October 2022
Who is funding the study?
The Alliance for Potato Research and Education (APRE) (USA)
Who is the main contact?
Dr Tracey Robertson - Email: t.m.robertson@surrey.ac.uk
Contact information
Scientific
Department of Nutritional Sciences
University of Surrey
Leggett Building
Daphne Jackson Rd
Guildford
GU2 7WG
United Kingdom
 ORCID ID |
0000-0002-8519-7572 |
|---|---|
| Phone | +44 (0)1483 688609 |
| t.m.robertson@surrey.ac.uk |
Study information
| Primary study design | Interventional |
|---|---|
| Study design | Non-randomized; Interventional; Design type: Prevention, Dietary |
| Secondary study design | Randomised controlled trial |
| Study type | Participant information sheet |
| Scientific title | The effect of potato form and consumption pattern on acute glycaemia in individuals with type 2 diabetes |
| Study objectives | 1. The way potato is prepared will affect the blood glucose response to its consumption 2. The addition of protein and fat to potato prepared in different ways, will reduce both the overall blood glucose response and any differences between different potato preparations in comparison to the identical potato meals consumed in isolation |
| Ethics approval(s) | Approved 18/06/2021, London Bridge Research Ethics Committee (LHREC) (Skipton House, 80 London Road, Health Research Agency, SE1 6LH, UK; +44 (0) 207104 8202; londonbridge.rec@hra.nhs.uk), ref: 21/PR/0672 |
| Health condition(s) or problem(s) studied | Type 2 diabetes |
| Intervention | The study will be a randomised crossover study consisting of 12 study visits per participant. Each study visit will last approximately 4 hours. Participants will arrive in the morning after an overnight fast. They will provide a finger-prick blood sample then consume the study meal. They will continue to provide finger-prick blood samples at regular intervals for the next 3 hrs. There are 6 different study meals; each participant will consume each meal twice over the course of their 12 study mornings. Each study visit will be separated by at least 2 days. |
| Intervention type | Other |
| Primary outcome measure(s) |
At each visit using blood test: |
| Key secondary outcome measure(s) |
At each visit using blood test: |
| Completion date | 11/10/2022 |
Eligibility
| Participant type(s) | Patient |
|---|---|
| Age group | Adult |
| Lower age limit | 18 Years |
| Upper age limit | 70 Years |
| Sex | All |
| Target sample size at registration | 12 |
| Total final enrolment | 12 |
| Key inclusion criteria | 1. Patients with a diagnosis of type 2 diabetes >6 months 2. Males and females 3. Aged 18-70 years 4. Ability to understand English (to provide informed consent) |
| Key exclusion criteria | 1. Use of insulin and GLP-1 analogues 2. History of gastroparesis or gastric surgery 3. Coeliac disease/wheat intolerance 4. Irritable bowel syndrome 5. HbA1c >75 mmol/mol 6. Pregnancy/breastfeeding 7. Excess alcohol intake 8. Glucose-lowering drug dosage adjustment within the previous month 9. Antibiotics in the last 3 months |
| Date of first enrolment | 01/08/2021 |
| Date of final enrolment | 30/04/2022 |
Locations
Countries of recruitment
- United Kingdom
- England
Study participating centre
Guildford
GU2 7XH
United Kingdom
Results and Publications
| Individual participant data (IPD) Intention to share | No |
|---|---|
| IPD sharing plan summary | Data sharing statement to be made available at a later date |
| IPD sharing plan | The current data sharing plans for this study are unknown and will be available at a later date. |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| HRA research summary | 28/06/2023 | No | No | ||
| Participant information sheet | Participant information sheet | 11/11/2025 | 11/11/2025 | No | Yes |
Editorial Notes
29/05/2024: The intention to publish date was changed from 01/04/2024 to 31/10/2024.
16/11/2023: The intention to publish date was changed from 01/10/2023 to 01/04/2024.
11/10/2022: The following changes were made to the trial record:
1. The overall end date was changed from 01/09/2022 to 11/10/2022.
2. The total final enrolment was added.
3. The plain English summary was updated to reflect these changes.
26/07/2021: Trial's existence confirmed by the NIHR.
