AzTrials
AzTrials

Diabetes MellitusVITAL-CGMNCT05935514

Improving Glycemic Control Using a Virtual Weight Control Program and Continuous Glucose Monitoring

A study testing WW Intervention in people with Diabetes Mellitus and Type 2 Diabetes, run by Pennington Biomedical Research Center at 3 sites in United States.

Completed

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

Official record
Search all trials

Trial summary

This study is a randomized clinical trial with the primary aim examining the efficacy of a novel integrated solution of a digitally delivered behavioral weight management program tailored for diabetes utilizing a continuous glucose monitor (CGM) built into the WW digital platform for adults with type 2 diabetes (T2D)… Read more about this study

Who is it for?
Ages 18 to 69 years
Conditions the study is for
Diabetes Mellitus, Type 2 Diabetes, Obesity
What is being tested?
WW Intervention
Could I receive a placebo?
No, everyone receives an active treatment
How many people
152 participants
Where
3 sitesUnited States
Study dates
22 Aug 2023to 23 Oct 2025
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 69 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • 18.0 - <70 years of age
  • Participant-reported diagnosis of type 2 diabetes
  • HbA1c 7.5%-11% (inclusive)
  • Overweight or obesity (BMI 25-50 kg/m2 or BMI 23-50 kg/m2 if Asian or Asian American)
  • On stable regimen of medications that can affect weight or diabetes outcomes for at least 3 months (brief regimens of medications such as antibiotics, steroids, etc. are permitted)
  • Weight stable (+/- 5%) over previous:
Show all 16Show fewer
  • 3 months
  • Or 6 months if on medications that impact weight like GLP-1 diabetes medications.
  • Willingness to attend weekly WW Virtual Workshops and Weekly Check-Ins and participate in WW Digital program
  • Willingness to lose weight through a diet and lifestyle change intervention
  • Access to a smartphone/tablet that can download the WW app
  • Willingness to wear a continuous glucose monitor for duration of the trial
  • Willing and able to provide a valid email address for use in the study
  • Be able to communicate (oral and written) in English
  • Be under the care of a physician who will be responsible for managing the subject's diabetes and a participant who is willing to give release to provide their treating MD with information about the trial
  • Be able to provide informed consent

Who cannot join

  • Participation in a structured, formal weight control program within the past 3 months
  • Use of a continuous glucose monitor within the past 3 months (consistently for 4 weeks or more where blood sugar recordings could be seen/monitored in real time)
  • Weight loss surgery (sleeve or bypass)
  • History of major surgery within 6 months of enrollment
  • Type 1 diabetes
  • More than 1 severe hypoglycemic event (requiring emergency medical services) in the past 12 months, unless the participant's physician provides written clearance for participation
Show all 23Show fewer
  • Any history of significant kidney or liver disease or malnutrition that in investigator judgment should exclude participation
  • Hemoglobinopathy that interferes with measurement of HbA1c
  • Class II or higher congestive heart failure
  • Unstable heart disease (an ongoing workup or treatment for a cardiac symptom such as unstable angina, coronary ischemia)
  • Presence of implanted cardiac defibrillator
  • Blood pressure ≥160/100 mm Hg. If a potential participant has a blood pressure ≥160/100 mm Hg it is acceptable to re-test this potential participant within one week of the original test
  • Thyroid disease for which the participant is untreated or has had treatment changed within the last 6 months. History of thyroid disease or current thyroid disease treated with a stable medication regimen for at least 2 months is acceptable
  • Orthopedic limitations that would interfere with ability to engage in regular physical activity
  • Uncontrolled gastrointestinal disorders including chronic malabsorptive conditions, peptic ulcer disease, Crohn's disease, chronic diarrhea or active gallbladder disease
  • Current cancer or cancer treatment, or a history of cancer or cancer treatment within the last 3 years. Exceptions include 1) successfully resected non-melanoma carcinoma of the skin, 2) basal or squamous cell skin cancer, 3) stage 0 non-invasive carcinoma of the cervix, 4) stage 0 non-invasive prostate cancer
  • Dementia, psychiatric illness, or substance abuse that may interfere with adherence (e.g., illness that is currently unstable or resistant to first-line therapy; substance abuse in the past year)
  • History of clinically diagnosed eating disorder including anorexia nervosa or bulimia nervosa.
  • Women who are pregnant, lactating, trying to become pregnant or unwilling to use an effective means of birth control
  • Currently consuming >14 alcoholic drinks (1 drink = 12 fl oz beer, 4 fl oz wine or 1.5 fl oz liquor) per week and unwilling to limit intake to less than 3 drinks per day during study participation
  • Participation in another clinical trial within 30 days prior to enrollment
  • Participation in WW anytime in the last 12 months
  • Any other condition or factor which in the opinion of the study physician or investigator makes it inadvisable for the candidate to participate in the trial

Trial locations and contacts

3 sites in 1 country.

United States3 sites
  • Pennington Biomedical Research Center

    Baton Rouge, Louisiana, 70808

  • Stanford University

    Stanford, California, 94305

  • Wake Forest University Health Sciences

    Winston-Salem, North Carolina, 27101

Other trials in United States

About this study

Official title: Improving Glycemic Control Using a Virtual Weight Control Program and Continuous Glucose Monitoring in Adults With Type 2 Diabetes

This study is a randomized clinical trial with the primary aim examining the efficacy of a novel integrated solution of a digitally delivered behavioral weight management program tailored for diabetes utilizing a continuous glucose monitor (CGM) built into the WW digital platform for adults with type 2 diabetes (T2D) for the reduction of HbA1c.

Read the detailed description

This study is a 12-month, two-arm, parallel controlled trial. A total of 152 adults with overweight or obesity and type 2 diabetes were randomized to either 1) intervention, or 2) usual care. The intervention arm will participate in the WW program modified for people with T2D including weekly Virtual Workshops and use of the WW App plus FreeStyle Libre 2 continuous glucose sensors. The WW program is a widely available, commercial weight management program that encourages healthy habits in the areas of food, activity, mindset, and sleep, with topics specific to diabetes. Participants in the usual care arm will receive their normal, usual care from their healthcare providers in addition to a session with a Registered Dietician at baseline. All participants will participate in the collection of patient-reported outcomes at baseline and at 6 and 12 months.

Being tested
WW Intervention, Usual Care
Medical subject headings
Diabetes Mellitus, Diabetes Mellitus, Type 2, Obesity

What participants receive

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

  • WW InterventionBehavioural

    The core of the WW food program is the Points® system which assigns each food and beverage a Points® value. Participants will be assigned a personalized daily and weekly Points® Budget, based on reported goals, and designed to create an energy deficit, using the Mifflin St-Jeor formula, which uses age, sex, height, and weight to estimate resting energy expenditure. Participants will also be provided with the FreeStyle Libre 2 Flash Glucose Monitoring System, which is intended to monitor interstitial fluid glucose levels to aid users in the management of diabetes. The System consists of the following primary components: 1) A disposable sensor that incorporates a subcutaneously implanted electrochemical glucose sensor and associated on-body electronics, and 2) A disposable, sensor application device, which is used to adhere the sensor to the skin of the user and to insert the sensor tail just below the surface of the skin.

  • Usual CareBehavioural

    The Usual Care arm will continue to receive routine medical care by their provider, in addition to a 50-minute virtual, on-line session with a Registered Dietician, with additional materials at the time of their 6- and 12-month follow-up assessments.

Study groups in NCT05935514
Study groupRoleWhat they receive
WW InterventionExperimentalParticipants in the intervention arm will receive a voucher code that provides 12 months of access to the WW program and instructions for redeeming the code by study staff. The program will include access to weekly Virtual Workshops and the WW App. WW is a widely available, commercial behavioral weight management program that encourages healthy habits in the areas of food, activity, mindset, and sleep, with topics tailored specific to T2D. Participants will also be provided with the FreeStyle Libre 2 Flash Glucose Monitoring System to wear for the duration of the trial.
Receives: Behavioral: WW Intervention
Usual CareActive comparatorPatients in the Usual Care group will continue to receive routine medical care by their healthcare provider. In addition, within 4 weeks of the baseline visit, participants in the Usual Care group will receive one 50-minute virtual on-line session of nutrition counseling with a registered dietitian with additional materials at the time of their 6- and 12-month follow-up assessments, based on current recommendations of the American Diabetes Association.
Receives: Behavioral: Usual Care

What is being measured

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

  1. Change in HbA1c% at 6 months

    Hemoglobin A1c levels (%) are measured using standard laboratory methods

    Measured: Baseline to 6 months

Secondary outcomes (19)
  1. Change in HbA1c% at 12 months

    Hemoglobin A1c levels (%) are measured using standard laboratory methods

    Measured: Baseline and 12 months

  2. Percent weight loss at 6 months

    Body weight is measured using standard methods with the patient wearing light clothing

    Measured: Baseline and 6 months

  3. Percent weight loss at 12 months

    Body weight is measured using standard methods with the patient wearing light clothing

    Measured: Baseline and 12 months

  4. Change in systolic blood pressure at 6 months

    Systolic blood pressure is measured using standard clinical methods

    Measured: Baseline and 6 months

  5. Change in systolic blood pressure at 12 months

    Systolic blood pressure is measured using standard clinical methods

    Measured: Baseline and 12 months

  6. Change in diastolic blood pressure at 6 months

    Diastolic blood pressure is measured using standard clinical methods

    Measured: Baseline and 6 months

  7. Change in diastolic blood pressure at 12 months

    Diastolic blood pressure is measured using standard clinical methods

    Measured: Baseline and 12 months

  8. Change in diabetes distress at 6 months

    The Diabetes Distress Scale (DDS-17) contains 17 total items with 4 subscales: Emotional Burden (items 1, 3, 8, 11, 14), Physician-related distress (items 2, 4, 9, 15), Regimen-related distress (items 5, 6, 10, 12, 16), and Interpersonal distress (7, 13, 17). The total score is calculated by taking an average of participant responses to all 17 items. In the same manner, each subscale can have its own score by taking an average of subscale specific participant responses. A mean item score of 3 or higher is considered moderate distress and a level of distress worthy of clinical attention. The Diabetes Distress scale has been tested for reliability and validity in US based populations and abroad.

    Measured: Baseline and 6 months

  9. Change in diabetes distress at 12 months

    The Diabetes Distress Scale (DDS-17) contains 17 total items with 4 subscales: Emotional Burden (items 1, 3, 8, 11, 14), Physician-related distress (items 2, 4, 9, 15), Regimen-related distress (items 5, 6, 10, 12, 16), and Interpersonal distress (7, 13, 17). The total score is calculated by taking an average of participant responses to all 17 items. In the same manner, each subscale can have its own score by taking an average of subscale specific participant responses. A mean item score of 3 or higher is considered moderate distress and a level of distress worthy of clinical attention. The Diabetes Distress scale has been tested for reliability and validity in US based populations and abroad.

    Measured: Baseline and 12 months

  10. Change in diabetes treatment satisfaction at 6 months

    This survey is an 8-item survey that measures satisfaction of treatment plan for diabetes that includes use of medications, diet, and lifestyle change methods. DTSQ is not only used for comparisons between different treatment strategies but also used to assess quality of diabetes care in clinical settings. Each question is scored from zero to six, and the scores are summed, with higher scores indicating higher treatment satisfaction.

    Measured: Baseline and 6 months

  11. Change in diabetes treatment satisfaction at 12 months

    This survey is an 8-item survey that measures satisfaction of treatment plan for diabetes that includes use of medications, diet, and lifestyle change methods. DTSQ is not only used for comparisons between different treatment strategies but also used to assess quality of diabetes care in clinical settings. Each question is scored from zero to six, and the scores are summed, with higher scores indicating higher treatment satisfaction.

    Measured: Baseline and 12 months

  12. Change in quality of life at 6 months

    The Impact of Weight on Quality of Life-Lite is a validated self-report measure for an individuals perception of how their weight affects their day-to-day life. There are 31 items rated on a Likert scale 5-Always True to 1-Never True. Items are broken into subscales for physical function, self-esteem, sexual life, public distress, and work. Scale scores are obtained by adding item scores, and the total score is obtained by adding scale scores. Higher scores indicate poorer quality of life. Transformed scores range from 0 to 100, with higher scores indicating greater quality of life.

    Measured: Baseline and 6 months

  13. Change in quality of life at 12 months

    The Impact of Weight on Quality of Life-Lite is a validated self-report measure for an individuals perception of how their weight affects their day-to-day life. There are 31 items rated on a Likert scale 5-Always True to 1-Never True. Items are broken into subscales for physical function, self-esteem, sexual life, public distress, and work. Scale scores are obtained by adding item scores, and the total score is obtained by adding scale scores. Higher scores indicate poorer quality of life. Transformed scores range from 0 to 100, with higher scores indicating greater quality of life.

    Measured: Baseline and 12 months

  14. Percentage of patients achieving 3% weight loss at 6 months

    Body weight is measured using standard methods with the patient wearing light clothing

    Measured: Baseline and 6 months

  15. Percentage of patients achieving 3% weight loss at 12 months

    Body weight is measured using standard methods with the patient wearing light clothing

    Measured: Baseline and 12 months

  16. Percentage of patients achieving 5% weight loss at 6 months

    Body weight is measured using standard methods with the patient wearing light clothing

    Measured: Baseline and 6 months

  17. Percentage of patients achieving 5% weight loss at 12 months

    Body weight is measured using standard methods with the patient wearing light clothing

    Measured: Baseline and 12 months

  18. Percentage of patients achieving 10% weight loss at 6 months

    Body weight is measured using standard methods with the patient wearing light clothing

    Measured: Baseline and 6 months

  19. Percentage of patients achieving 10% weight loss at 12 months

    Body weight is measured using standard methods with the patient wearing light clothing

    Measured: Baseline and 12 months

Timeline

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

  1. First posted7 Jul 2023
  2. Study start22 Aug 2023
  3. Primary completion23 Oct 2025
  4. Study completion23 Oct 2025

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
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Double blind
Who is masked
Investigator, Outcomes assessor
Enrolment
152 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05935514
Sponsor's protocol ID
PBRC 2022-048
Acronym
VITAL-CGM
Status last verified
Feb 2026
First submitted
29 Jun 2023
Last updated
4 Feb 2026
Results posted
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Yes: A de-identified individual-level dataset will be made available to researchers making a reasonable request to the principal investigator. Data will be made available 1 year after publication of the primary outcomes manuscript.

Publications

  • Katzmarzyk PT, Drews K, Ard JD, McLaughlin TL, Harris MN, Lee A, Foster GD, Lee HJ, Dunn TC, Martin CK, Greenway FL, Cardel MI. Virtual Weight Management and Continuous Glucose Monitoring in Patients With Type 2 Diabetes: A Randomized Controlled Trial. Obesity (Silver Spring). 2026 Jun;34(6):1254-1264. doi: 10.1002/oby.70204. Epub 2026 Apr 28.

    PubMed 42047631

Questions about this trial

What is this clinical trial studying?

A study testing WW Intervention in people with Diabetes Mellitus and Type 2 Diabetes, run by Pennington Biomedical Research Center at 3 sites in United States.

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 23 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 4 Feb 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 3 sites in United States. 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?

Change in HbA1c% at 6 months (time frame: Baseline to 6 months). 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 NCT05935514, which also lists 1 linked publication.

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 4 Feb 2026; AzTrials last refreshed its copy on 1 Nov 2026.

Free account

Log in to keep searching

You’ve used your 3 free searches. AzTrials is free: log in or create a free account to keep searching clinical trials and save the ones you want to follow.

Create a free accountLog in