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HealthyNCT05913635

Effects of Time-Restricted Fasting on the Postprandial Glycemic Responses

A study testing Consumption of lunch and dinner, with no breakfast and Consumption of breakfast and lunch, with no dinner in people with Healthy, run by Fudan University at 1 site in China.

Unknown status

Status not confirmed. The sponsor has not verified this record for over two years, so it may be out of date.

Official record
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Trial summary

The goal of this clinical trial is to investigate whether fasting timing has a significant effect on postprandial glycemic responses in healthy adults. The main questions it aims to answer are: 1. Whether fasting timing has a significant effect on postprandial insulin actions and plasma glucose concentration. 2. Read more about this study

Who is it for?
Ages 18 to 40 yearsHealthy volunteers can take part
Conditions the study is for
Healthy
What is being tested?
Consumption of lunch and dinner, with no breakfast and Consumption of breakfast and lunch, with no dinner
Could I receive a placebo?
No, everyone receives an active treatment
How many people
36 participants
Where
1 siteChina
Study dates
1 Sep 2022to 31 Dec 2023
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 40 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Both men and women are eligible.
  • Age: 18-40 years old.
  • Healthy adults: no history of diabetes mellitus, no use of hypoglycemic drugs, no insulin injection.
  • All participants have a good sleep circle, with no somnipathy.

Who cannot join

  • Severe mental illness or other major medical comorbidities and autoimmune diseases (e.g., chronic renal failure, cardiovascular diseases, or cancer)
  • Skipping breakfast or dinner more than 10 times within 6 months.
  • Following a special diet, currently on weight loss medication, using sleeping medications.
  • Pregnancy or to be pregnant.

Trial locations and contacts

1 site in 1 country.

China1 site
  • Shanghai Institute of Planned Parenthood Research Hospital

    Shanghai, Shanghai Municipality, 200032

Other trials in China

About this study

Official title: Effects of Time-Restricted Fasting on the Postprandial Glycemic Responses in Chinese Adults: A Randomized Crossover Study

The goal of this clinical trial is to investigate whether fasting timing has a significant effect on postprandial glycemic responses in healthy adults. The main questions it aims to answer are:

  1. Whether fasting timing has a significant effect on postprandial insulin actions and plasma glucose concentration.
  2. Whether fasting timing could modulate the glycemic metabolome and circadian rhythms in healthy individuals.

Participants will get the two interventions:

No-dinner: breakfast at 7.30 a.m., lunch at 1.00 p.m. and no dinner; No-breakfast: no breakfast, lunch at 1.00 p.m. and dinner at 8.00 p.m.

Read the detailed description

A randomized, crossover study design is used with 2 intervention days and a 6-day washout period, to evaluate the effects of early and late fasting on postprandial glucose responses in healthy adults. Randomization was performed by the Fudan staff with a block size of 2 using a balanced design using computer-executed software. The primary endpoint is the fasting and postprandial blood glucose, insulin, and continuous glucose monitoring after fasting. Secondary endpoints include postprandial blood lipids, clock gene expressions in peripheral blood cells, and non-targeted postprandial plasma metabolome. The 2 intervention days include a no-breakfast day and a no-dinner day. The diets before, during, and after the intervention day was designed according to Dietary Guidelines for Chinese Residents (2022), and the energy distribution of three meals is 1:1:1, with the energy percentage of carbohydrate, protein, and fat being 55%, 15%, and 30%, respectively. The time of breakfast, lunch, and dinner is 7.30 a.m., 1.00 p.m., and 8.00 p.m., respectively. All participants are instructed to follow their natural dietary plans in the wash-out period, and the food intakes and sleep circle were recorded by a modified food frequency questionnaire (FFQ).

Conditions
Healthy
Being tested
Consumption of lunch and dinner, with no breakfast, Consumption of breakfast and lunch, with no dinner
Keywords
Time-Restricted Fasting, Postprandial Blood Glucose, Continuous Glucose Monitoring, Crossover trial
Medical subject headings
Intermittent Fasting

What participants receive

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

  • Consumption of lunch and dinner, with no breakfastBehavioural

    The day before intervention day, all participants will be provided with 3 nutritionally balanced meals which are designed by the investigators. On the no-breakfast intervention day, participants are instructed to fast and only be allowed to consume water until 1.00 p.m. and consume the above-designed lunch and dinner at 1.00 p.m. and 8.00 p.m. Additionally, all participants are informed that they are only allowed to consume water between meals and before receiving breakfast at 7.30 a.m. the following day.

  • Consumption of breakfast and lunch, with no dinnerBehavioural

    The day before intervention day, all participants will be provided with 3 nutritionally balanced meals which are designed by the investigators. On the no-dinner intervention day, participants are instructed to consume the above-designed breakfast and lunch at 7.30 a.m. and 1.00 p.m., and no dinner. Additionally, all participants are informed that they are only allowed to consume water between meals and before receiving breakfast at 7.30 a.m. on the following day.

Study groups in NCT05913635
Study groupRoleWhat they receive
No-breakfastExperimentalOne-day meal plan with no breakfast. The dietary plan has been developed according to the Dietary Guidelines for Chinese Residents (2022), and the energy distribution of the two meals (lunch and dinner) is 1:1, with the energy percentage of carbohydrates, proteins, and fats being 55%, 15%, and 30%, respectively. The total daily calorie intake has been calculated based on the gender difference of the participants. Since the recommended daily calorie intake for males is 2000 kcal while for females it is 1600 kcal, each meal for males is designed to provide 667 kcal calories, comprising 92g carbohydrates, 22g fat, and 25g protein; each meal for females is designed to provide 533 kcal calories, comprising 73g carbohydrates, 18g fat, and 20g protein. The carbohydrates are sourced from buckwheat flour and mixed grain rice, which create similar glycemic indexes for each meal. Additionally, the one-day meal for both males and females includes 450g of vegetables and 320g of fruits.
Receives: Behavioral: Consumption of lunch and dinner, with no breakfast
No-dinnerExperimentalOne-day meal plan with no dinner. The dietary plan has been developed according to the Dietary Guidelines for Chinese Residents (2022), and the energy distribution of the two meals (breakfast and lunch) is 1:1, with the energy percentage of carbohydrates, proteins, and fats being 55%, 15%, and 30%, respectively. The total daily calorie intake has been calculated based on the gender difference of the participants. Since the recommended daily calorie intake for males is 2000 kcal while for females it is 1600 kcal, each meal for males is designed to provide 667 kcal calories, comprising 92g carbohydrates, 22g fat, and 25g protein; each meal for females is designed to provide 533 kcal calories, comprising 73g carbohydrates, 18g fat, and 20g protein. The carbohydrates are sourced from buckwheat flour and mixed grain rice, which create similar glycemic indexes for each meal. Additionally, the one-day meal for both males and females includes 450g of vegetables and 320g of fruits.
Receives: Behavioral: Consumption of breakfast and lunch, with no dinner

What is being measured

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

  1. Change from fasting to postprandial postprandial blood glucose

    The primary endpoint is fasting and postprandial blood glucose with hexokinase tests.

    Measured: Blood samples collected before and after 2 hours at lunch on the no-breakfast day; blood samples collected before and after 2 hours at next day breakfast on the no-dinner day

  2. Change from fasting to postprandial insulin

    Fasting and postprandial insulin will be tested by ELISA KIT.

    Measured: Blood samples collected before and after 2 hours at lunch on the no-breakfast day; blood samples collected before and after 2 hours at next day breakfast on the no-dinner day

  3. Results of continuous glucose monitoring

    Continuous glucose will be monitored by Abott glucose monitor.

    Measured: From the day before the first intervention day and the wash-out period till the day after the second intervention day (10 days in total)

Secondary outcomes (3)
  1. Change from fasting to postprandial blood lipids

    Fasting and postprandial total-, HDL-, LDL-cholesterol, triglyceride will be tested.

    Measured: Blood samples collected before and after 2 hours at lunch on the no-breakfast day; blood samples collected before and after 2 hours at next day breakfast on the no-dinner day

  2. Analyzes of clock gene expression in peripheral blood cells (PBC)

    Clock gene expression in PBC will be evaluated by RT-PCR.

    Measured: PBC samples collected before and after 2 hours at lunch on the no-breakfast day; blood samples collected before and after 2 hours at next day breakfast on the no-dinner day

  3. Analyzes of postprandial plasma metabolome

    Non-targeted plasma metabolites will be tested by LC-MS-MS after 2 hours of each meal.

    Measured: Blood samples collected at 2 hours after each meal

Timeline

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

  1. First posted22 Jun 2023
  2. Study start1 Sep 2022
  3. Primary completion25 Dec 2022
  4. Study completion31 Dec 2023 (estimated)

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
Prevention
Allocation
Randomised
Intervention model
Crossover
Model description
A randomized, crossover study design uses two intervention days (a no-breakfast day and a no-dinner day) and a 6-day washout period.
Masking
Single blind
Who is masked
Outcomes assessor
Enrolment
36 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05913635
Sponsor's protocol ID
21PJD005
Status last verified
Jun 2023
First submitted
11 Jun 2023
Last updated
22 Jun 2023
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No

Publications

  • Nas A, Mirza N, Hagele F, Kahlhofer J, Keller J, Rising R, Kufer TA, Bosy-Westphal A. Impact of breakfast skipping compared with dinner skipping on regulation of energy balance and metabolic risk. Am J Clin Nutr. 2017 Jun;105(6):1351-1361. doi: 10.3945/ajcn.116.151332. Epub 2017 May 10.

    PubMed 28490511
  • Jakubowicz D, Wainstein J, Landau Z, Raz I, Ahren B, Chapnik N, Ganz T, Menaged M, Barnea M, Bar-Dayan Y, Froy O. Influences of Breakfast on Clock Gene Expression and Postprandial Glycemia in Healthy Individuals and Individuals With Diabetes: A Randomized Clinical Trial. Diabetes Care. 2017 Nov;40(11):1573-1579. doi: 10.2337/dc16-2753. Epub 2017 Aug 22.

    PubMed 28830875
  • Ogata H, Kayaba M, Tanaka Y, Yajima K, Iwayama K, Ando A, Park I, Kiyono K, Omi N, Satoh M, Tokuyama K. Effect of skipping breakfast for 6 days on energy metabolism and diurnal rhythm of blood glucose in young healthy Japanese males. Am J Clin Nutr. 2019 Jul 1;110(1):41-52. doi: 10.1093/ajcn/nqy346.

    PubMed 31095288
  • Garaulet M, Lopez-Minguez J, Dashti HS, Vetter C, Hernandez-Martinez AM, Perez-Ayala M, Baraza JC, Wang W, Florez JC, Scheer FAJL, Saxena R. Interplay of Dinner Timing and MTNR1B Type 2 Diabetes Risk Variant on Glucose Tolerance and Insulin Secretion: A Randomized Crossover Trial. Diabetes Care. 2022 Mar 1;45(3):512-519. doi: 10.2337/dc21-1314.

    PubMed 35015083
  • Lopez-Minguez J, Saxena R, Bandin C, Scheer FA, Garaulet M. Late dinner impairs glucose tolerance in MTNR1B risk allele carriers: A randomized, cross-over study. Clin Nutr. 2018 Aug;37(4):1133-1140. doi: 10.1016/j.clnu.2017.04.003. Epub 2017 Apr 10.

    PubMed 28455106

Questions about this trial

What is this clinical trial studying?

A study testing Consumption of lunch and dinner, with no breakfast and Consumption of breakfast and lunch, with no dinner in people with Healthy, run by Fudan University at 1 site in China.

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 4 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: status not confirmed, as of the sponsor's last update on 22 Jun 2023. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.

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?

Results are not available in the source record.

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?

Change from fasting to postprandial postprandial blood glucose (time frame: Blood samples collected before and after 2 hours at lunch on the no-breakfast day; blood samples collected before and after 2 hours at next day breakfast on the no-dinner day). The study lists 3 primary outcomes in all. 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 NCT05913635, which also lists 5 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 22 Jun 2023.

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