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Overweight , ObesityRCSOGRABCICSNCT07818005

Retrospective Continuous Glucose Monitor (CGM) Study on Glycemic Response and Body Composition in College Students

An observational study of Overweight , Obesity and Weight Loss, run by He Eye Hospital at 1 site in China.

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

This retrospective study evaluates the real-world effect of individualized glycemic response-guided dietary management, based on continuous glucose monitoring (CGM), on weight and body composition in overweight and obese university students. Read more about this study

Who is it for?
Ages 18 to 25 years
Conditions the study is for
Overweight , Obesity, Weight Loss
How many people
59 participants
Where
1 siteChina
Study dates
27 Jun 2026to 15 Aug 2026
Phase
Observational
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 25 years
  • All sexes
  • No healthy volunteers
  • Adult

Study population: Overweight and obese university students (aged 18-25 years) at He University, Shenyang, Liaoning, China, whose records are contained in the archived dataset of a randomized controlled trial of a 4-week continuous glucose monitoring (CGM)-guided personalized dietary intervention. Participants had a body mass index (BMI) ≥ 24 kg/m² or elevated body fat percentage (≥ 25% in men, ≥ 32% in women) and self-reported at least two unhealthy eating behaviors. Of the 60 participants enrolled in the parent trial (30 per group), 59 were included in this retrospective analysis (30 exposed, 29 non-exposed); one non-exposed participant was excluded for missing primary outcome data. All participants were free of diabetes, prediabetes, and other exclusion conditions defined in the study protocol.

Who may be able to join

  • University students aged 18 to 25 years
  • Body mass index (BMI) ≥ 24.0 kg/m², or body fat percentage ≥ 25% (male) / ≥ 32% (female)
  • Self-reported presence of at least two unhealthy eating behaviors
  • Written informed consent
  • Exclusion Criteria:• Obesity due to endocrine diseases (e.g., Cushing's syndrome, hypothyroidism, hypothalamic obesity) or genetic syndromes
  • Polycystic ovary syndrome (PCOS)
Show all 16Show fewer
  • Weight gain or glycemic abnormality induced by medications (e.g., glucocorticoids, antipsychotics, insulin secretagogues)
  • Diagnosed diabetes (type 1 or type 2) or prediabetes (fasting glucose ≥ 6.1 mmol/L or glycated hemoglobin (HbA1c)≥ 5.7%)
  • Diagnosed dyslipidemia with lipid-lowering medication
  • High risk of eating disorders identified by the Eating Disorder Diagnostic Scale (EDDS)
  • Severe psychiatric disorders or psychotropic medication use
  • Pregnancy, lactation, or planned pregnancy within 6 months
  • Allergy to CGM adhesive or hydrogel, or active skin disease affecting sensor wear
  • Professional athletes (high-intensity physical activity ≥ 5 times/week, ≥ 60 min/session)
  • Weight change > 5% of initial body weight within the past 3 months
  • Participation in other commercial or clinical weight-loss programs

Who cannot join

None listed.

Trial locations and contacts

1 site in 1 country.

China1 site
  • He University, Shenyang, Liaoning, China

    Shenyang, Liaoning

Other trials in China

About this study

Official title: A Retrospective Study of Individual Glycemic Response Based on CGM Wearable Devices in Weight and Body Composition Management Among College Students

This retrospective study evaluates the real-world effect of individualized glycemic response-guided dietary management, based on continuous glucose monitoring (CGM), on weight and body composition in overweight and obese university students. All data for this analysis were retrospectively retrieved from the archived records of a randomized controlled trial conducted at He University, in which 60 students (body mass index [BMI] ≥ 24 kg/m² or elevated body fat percentage) had worn CGM sensors for 4 weeks. The archived records show that the exposed group (n = 30) had received individualized dietary guidance generated from their own glucose responses, including structured CGM reports, meal composition and eating-order advice, and standardized feedback, whereas the non-exposed group (n = 30) had worn CGM without receiving any dietary guidance. One non-exposed participant was excluded from this retrospective analysis for missing primary outcome data, leaving 59 participants for analysis. The archived dataset contains body composition (weight, body mass index [BMI], body fat mass, percent body fat, skeletal muscle mass, visceral fat level) and eating behavior records at Day 0, Day 28, and Day 90. This analysis examines whether the 4-week intervention produced sustained, fat-mass-driven improvements in body composition and whether changes in eating behavior mediated these effects.

Read the detailed description

Background: continuous glucose monitoring (CGM) technology is expanding from diabetes care to weight management in healthy populations. Individualized glycemic response-guided dietary management may improve weight loss efficiency, but whether a brief 4-week intervention produces sustained body composition benefits remains unclear.

Design: This is a retrospective analysis of data collected in a two-arm, parallel-group randomized controlled trial conducted at He University, Shenyang, China. No new intervention was administered and no new measurements were performed in the present study; all data were retrospectively extracted from existing archived records. Participants were classified into two cohorts according to the exposure documented in the archived data of the parent trial. The archived records document that 60 overweight or obese university students (aged 18-25 years) had been randomized 1:1 by a random number table in the parent trial, and that both groups had worn the GX-01S continuous glucose monitoring system for 4 weeks (28 days). The archived records show that the exposed group had received an individualized glycemic response-guided dietary intervention: weeks 1-2 served as a dietary behavior observation period (CGM glucose profiles and electronic food diaries), and weeks 3-4 comprised the individualized intervention, including structured CGM reports (glucose trend graphs, traffic-light food lists, individually glucose-sensitive time windows), dietary guidance on meal composition and eating order, and standardized researcher feedback. The archived records show that the non-exposed group had worn CGM without dietary guidance; CGM data were visible during weeks 1-2 and blinded during weeks 3-4.

Assessments: The archived dataset contains body composition measurements recorded with the InBody 120 bioelectrical impedance analyzer at Day 0 (baseline), Day 28 (end of the 4-week period), and Day 90 (follow-up), together with Dutch Eating Behavior Questionnaire (DEBQ) records at the same three timepoints. All values were retrospectively extracted; no additional measurement was performed for this study.

Outcomes: Primary outcomes of the parent study were time above range (TAR) change and body weight change, both derived from the archived records. This analysis focuses on body composition outcomes: weight, body mass index (BMI), percent body fat, body fat mass, skeletal muscle mass, visceral fat level, and segmental body fat across five body compartments, together with exploratory mediation analyses testing whether DEBQ subscale changes (restrained, emotional, and external eating) mediated the intervention effect.

Ethics: The parent study was approved by the Institutional Ethics Committee of He University, and all participants provided written informed consent. For this retrospective analysis of anonymized data, the ethics committee approved a waiver of renewed informed consent.

Keywords
continuous glucose monitoring, personalized nutrition, body composition, eating behavior, university students, retrospective study
Medical subject headings
Overweight, Obesity, Weight Loss, Feeding Behavior

What participants receive

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

Study groups in NCT07818005
Study groupRoleWhat they receive
Exposed (n=30)Participants whose archived records from the parent trial indicate that they had received a 4-week individualized glycemic response-guided dietary intervention based on continuous glucose monitoring (CGM) data: dietary behavior observation during weeks 1-2, followed by structured CGM reports, dietary guidance on meal composition and eating order, and standardized researcher feedback during weeks 3-4.
Non-exposed (n=29)Participants whose archived records from the parent trial indicate that they had worn the CGM system for 4 weeks without receiving dietary guidance or feedback. CGM data were visible during weeks 1-2 and blinded during weeks 3-4. Participants maintained their usual diet and lifestyle. One of the 30 non-exposed participants enrolled in the parent trial was excluded from this retrospective analysis for missing primary outcome data.

What is being measured

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

  1. Time above range (TAR)

    Change in the percentage of time above the target glucose range recorded in the archived CGM dataset. Unit of Measure: Percent of time (%).

    Measured: Data recorded at baseline, Day 14, and Day 28

  2. Body weight

    Change in body weight recorded in the archived InBody 120 dataset. Unit of Measure: Kilogram (kg).

    Measured: Data recorded at Day 0, Day 28, and Day 90

Secondary outcomes (31)
  1. Body fat mass

    Change in total body fat mass derived from the archived InBody 120 records. Unit of Measure: Kilogram (kg).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  2. Body mass index (BMI)

    Change in body mass index, calculated as body weight in kilograms divided by the square of body height in meters, derived from the archived InBody 120 records. Unit of Measure: Kilogram per square meter (kg/m²).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  3. Percent body fat

    Change in body fat percentage, calculated as body fat mass divided by total body weight, derived from the archived InBody 120 records. Unit of Measure: Percent (%).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  4. Skeletal muscle mass

    Change in skeletal muscle mass derived from the archived InBody 120 records. Unit of Measure: Kilogram (kg).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  5. Visceral fat level

    Change in visceral fat level derived from the archived InBody 120 records. Scale range: minimum 1, maximum 20; higher levels indicate greater visceral adiposity (worse). Unit of Measure: InBody visceral fat level (unitless scale, 1-20).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  6. Waist circumference

    Change in waist circumference derived from the archived anthropometric records. Unit of Measure: Centimeter (cm).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  7. Hip circumference

    Change in hip circumference derived from the archived anthropometric records. Unit of Measure: Centimeter (cm).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  8. Waist-hip ratio

    Change in waist-hip ratio, calculated as waist circumference divided by hip circumference, derived from the archived anthropometric records. Unit of Measure: Ratio (unitless).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  9. Time in range (TIR)

    Change in the percentage of time within the target glucose range derived from the archived CGM records. Unit of Measure: Percent of time (%).

    Measured: Data recorded from Day 0 to Day 28

  10. Average glucose (AG)

    Change in average glucose derived from the archived CGM records. Unit of Measure: Millimole per liter (mmol/L).

    Measured: Data recorded from Day 0 to Day 28

  11. Coefficient of variation (CV)

    Change in the coefficient of variation of glucose derived from the archived CGM records. Unit of Measure: Percent (%).

    Measured: Data recorded from Day 0 to Day 28

  12. DEBQ restrained eating subscale

    Change in the restrained eating subscale score of the Dutch Eating Behavior Questionnaire (DEBQ), scored as the mean of its item ratings on a scale from 1 (minimum) to 5 (maximum), derived from the archived records. Higher scores indicate a greater tendency toward restrained eating; in this study, increases in this score were considered favorable (better dietary self-regulation). Unit of Measure: Subscale score (1-5).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  13. DEBQ emotional eating subscale

    Change in the emotional eating subscale score of the Dutch Eating Behavior Questionnaire (DEBQ), scored as the mean of its item ratings on a scale from 1 (minimum) to 5 (maximum), derived from the archived records. Higher scores indicate a greater tendency to eat in response to negative emotions; in this weight-management context, higher scores are considered unfavorable (worse outcome). Unit of Measure: Subscale score (1-5).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  14. DEBQ external eating subscale

    Change in the external eating subscale score of the Dutch Eating Behavior Questionnaire (DEBQ), scored as the mean of its item ratings on a scale from 1 (minimum) to 5 (maximum), derived from the archived records. Higher scores indicate a greater tendency to eat in response to external food cues; in this weight-management context, higher scores are considered unfavorable (worse outcome). Unit of Measure: Subscale score (1-5).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  15. Eating Disorder Diagnostic Scale (EDDS) score

    Change in the Eating Disorder Diagnostic Scale (EDDS) symptom composite score derived from the archived records. Scale range: minimum 0, maximum 227; higher scores indicate more severe eating disorder symptoms (worse outcome). Unit of Measure: Score (0-227).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  16. Pittsburgh Sleep Quality Index (PSQI) score

    Change in the Pittsburgh Sleep Quality Index (PSQI) global score derived from the archived records. Scale range: minimum 0, maximum 21; higher scores indicate poorer sleep quality (worse outcome). Unit of Measure: Score (0-21).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  17. Perceived Stress Scale (PSS-10) score

    Change in the Perceived Stress Scale (PSS-10) total score derived from the archived records. Scale range: minimum 0, maximum 40; higher scores indicate greater perceived stress (worse outcome). Unit of Measure: Score (0-40).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  18. Traditional Chinese Medicine (TCM) balanced constitution score

    Change in the balanced constitution score of the Constitution in Chinese Medicine Questionnaire (CCMQ), transformed to a 0-100 scale per the standard scoring formula, derived from the archived records. Scale range: minimum 0, maximum 100; higher scores indicate a more balanced constitution (better outcome). Unit of Measure: Score (0-100).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  19. TCM qi-deficiency constitution score

    Change in the qi-deficiency constitution score of the Constitution in Chinese Medicine Questionnaire (CCMQ), transformed to a 0-100 scale per the standard scoring formula, derived from the archived records. Scale range: minimum 0, maximum 100; higher scores indicate stronger expression of this constitution type, i.e., greater constitutional imbalance (worse outcome). Unit of Measure: Score (0-100).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  20. TCM yang-deficiency constitution score

    Change in the yang-deficiency constitution score of the Constitution in Chinese Medicine Questionnaire (CCMQ), transformed to a 0-100 scale per the standard scoring formula, derived from the archived records. Scale range: minimum 0, maximum 100; higher scores indicate stronger expression of this constitution type, i.e., greater constitutional imbalance (worse outcome). Unit of Measure: Score (0-100).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  21. TCM yin-deficiency constitution score

    Change in the yin-deficiency constitution score of the Constitution in Chinese Medicine Questionnaire (CCMQ), transformed to a 0-100 scale per the standard scoring formula, derived from the archived records. Scale range: minimum 0, maximum 100; higher scores indicate stronger expression of this constitution type, i.e., greater constitutional imbalance (worse outcome). Unit of Measure: Score (0-100).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  22. TCM phlegm-dampness constitution score

    Change in the phlegm-dampness constitution score of the Constitution in Chinese Medicine Questionnaire (CCMQ), transformed to a 0-100 scale per the standard scoring formula, derived from the archived records. Scale range: minimum 0, maximum 100; higher scores indicate stronger expression of this constitution type, i.e., greater constitutional imbalance (worse outcome). Unit of Measure: Score (0-100).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  23. TCM damp-heat constitution score

    Change in the damp-heat constitution score of the Constitution in Chinese Medicine Questionnaire (CCMQ), transformed to a 0-100 scale per the standard scoring formula, derived from the archived records. Scale range: minimum 0, maximum 100; higher scores indicate stronger expression of this constitution type, i.e., greater constitutional imbalance (worse outcome). Unit of Measure: Score (0-100).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  24. TCM blood-stasis constitution score

    Change in the blood-stasis constitution score of the Constitution in Chinese Medicine Questionnaire (CCMQ), transformed to a 0-100 scale per the standard scoring formula, derived from the archived records. Scale range: minimum 0, maximum 100; higher scores indicate stronger expression of this constitution type, i.e., greater constitutional imbalance (worse outcome). Unit of Measure: Score (0-100).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  25. TCM qi-stagnation constitution score

    Change in the qi-stagnation constitution score of the Constitution in Chinese Medicine Questionnaire (CCMQ), transformed to a 0-100 scale per the standard scoring formula, derived from the archived records. Scale range: minimum 0, maximum 100; higher scores indicate stronger expression of this constitution type, i.e., greater constitutional imbalance (worse outcome). Unit of Measure: Score (0-100).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  26. TCM special diathesis constitution score

    Change in the special diathesis constitution score of the Constitution in Chinese Medicine Questionnaire (CCMQ), transformed to a 0-100 scale per the standard scoring formula, derived from the archived records. Scale range: minimum 0, maximum 100; higher scores indicate stronger expression of this constitution type, i.e., greater constitutional imbalance (worse outcome). Unit of Measure: Score (0-100).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  27. Right arm fat mass

    Change in body fat mass of the right arm derived from the archived InBody 120 records. Unit of Measure: Kilogram (kg).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  28. Left arm fat mass

    Change in body fat mass of the left arm derived from the archived InBody 120 records. Unit of Measure: Kilogram (kg).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  29. Trunk fat mass

    Change in body fat mass of the trunk derived from the archived InBody 120 records. Unit of Measure: Kilogram (kg).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  30. Right leg fat mass

    Change in body fat mass of the right leg derived from the archived InBody 120 records. Unit of Measure: Kilogram (kg).

    Measured: Data recorded at Day 0, Day 28, and Day 90

  31. Left leg fat mass

    Change in body fat mass of the left leg derived from the archived InBody 120 records. Unit of Measure: Kilogram (kg).

    Measured: Data recorded at Day 0, Day 28, and Day 90

Timeline

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

  1. First posted14 Sep 2026
  2. Study start27 Jun 2026
  3. Primary completion30 Jul 2026
  4. Study completion15 Aug 2026

Resources

More details

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

Study design
Study type
Observational
Observational model
Cohort
Time perspective
Retrospective
Enrolment
59 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07818005
Sponsor's protocol ID
IRB(2026)K005.01
Acronym
RCSOGRABCICS
Status last verified
Aug 2026
First submitted
25 Aug 2026
Last updated
14 Sep 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

An observational study of Overweight , Obesity and Weight Loss, run by He Eye Hospital 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 16 inclusion and 0 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 14 Sep 2026. 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?

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?

Time above range (TAR) (time frame: Data recorded at baseline, Day 14, and Day 28). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
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 14 Sep 2026.

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