Skip to content

Study Of Drinks With Artificial Sweeteners in People With Type 2 Diabetes

Effect of Artificially Sweetened Beverages on Diabetes Control in Adults With Type 2 Diabetes

Status
Completed
Phases
NA
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT03944616
Acronym
SODAS
Enrollment
181
Registered
2019-05-09
Start date
2019-06-06
Completion date
2024-03-21
Last updated
2025-09-11

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Type 2 Diabetes

Keywords

Diet beverages, diet, diabetes control, artificial sweeteners, continuous glucose monitor, gut microbiome, metabolomics

Brief summary

Diet beverages sweetened with artificial sweeteners occupy a unique category in the food environment as they are a source of intensely sweet taste with no calories. Diet beverages are the single largest contributor to artificial sweetener intake in the U.S. diet, and people with diabetes are the highest consumers of diet beverages, tending to consume them as a replacement for dietary sources of sugar, especially in place of sugar-sweetened beverages. This behavior has been endorsed by dietetic and scientific organizations, and diet beverages are marketed as being synonymous with better health, suitable for weight loss, and thus advantageous for diabetes control. The underlying public health concern is that there are few data to support or refute the benefit or harm of habitual diet beverage consumption by people with diabetes; therefore randomized trials with relevant outcomes must be conducted because they would address many limitations of previous research and have major implications for dietary recommendations on diet beverage intake and primary and secondary prevention of chronic disease. To begin addressing this important scientific gap the investigators are testing the effect of diet beverage intake on diabetes control parameters in free-living adults with type 2 diabetes in a randomized, two arm parallel trial with a run-in period of 2-weeks and an active intervention period of 24-weeks. This study will recruit 200 patients with type 2 diabetes who are usual consumers of commercial diet beverages and randomize them to receive and consume either: 1) A commercial diet beverage of choice (3 servings or 24 oz. daily); or 2) Unflavored bottled water of choice (sparkling or plain) (3 servings or 24 oz. daily). The primary outcome will be a central measure of clinical diabetes control in glycated hemoglobin (HbA1c). The study will also measure the nature and magnitude of glycemic excursions via continuous glucose monitors, as well as clinical markers of cardiometabolic risk and kidney function. Lastly, investigators will measure plausible mechanisms whereby diet beverage intake may alter risk by assessing the effect of diet beverage intake on the functional composition of the gut microbiome via stool samples and comprehensive metabolomics, satiety hormones, as well as usual dietary intake, and upstream behavioral pathways which may inform dietary intake patterns.

Interventions

BEHAVIORALDiet Beverage

Participants will receive and consume three daily servings (24 ounces) of a non-caloric commercial diet beverage of their choice sweetened with FDA approved artificial sweeteners.

BEHAVIORALWater

Participants will receive and consume three daily servings (24 ounces) of plain bottled/canned water in place of their usual commercial diet beverage. The water will be unflavored, unsweetened, non-caloric, and may be plain or sparkling. Participants randomized to consume water will be instructed to avoid intake of diet beverages.

Sponsors

University of Minnesota
CollaboratorOTHER
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
CollaboratorNIH
University of California, Irvine
Lead SponsorOTHER

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
SINGLE (Outcomes Assessor)

Masking description

All nursing staff/phlebotomist collecting physical samples, and the lab analyzing the samples will be masked to the trial arm the participant is in. The biostatistician performing the final analyses will also be masked.

Intervention model description

This study is testing the effect of commercial diet beverage intake on diabetes control parameters in free-living adults with type 2 diabetes in a randomized, two arm parallel trial with a run-in period of 2-weeks and an active intervention period of 24-weeks. We will recruit 200 patients with type 2 diabetes who are usual consumers of commercial diet beverages and randomize them to receive and consume either: 1) A commercial diet beverage of choice (3 servings or 24 oz. daily); or 2) Unflavored bottled water of choice (sparkling or plain) (3 servings or 24 oz. daily).

Eligibility

Sex/Gender
ALL
Age
35 Years to No maximum
Healthy volunteers
No

Inclusion criteria

We will include men, women and non-binary participants with T2D, age 35 years and older, able to provide informed consent, otherwise healthy, who meet the following criteria: * Physician diagnosed type 2 diabetes ≥ 6 months prior to screening * HbA1c 6.5-8.5% at participant screening * Current treatment with lifestyle changes or stable diabetes-related medication levels for the past 3 months * Willingness to provide consent to contact treating physician and physician agreement to refrain from changing diabetes-related medications during the trial (change defined as \> 2 fold change in dose of any 1 hyperglycemic agent or addition or subtraction of an agent) * No physician-directed medication change for 3 months if prescribed medication for lipids or blood pressure * Usual consumers of diet beverages (≥ 3 servings/ week (24 oz.) and the willingness to maintain fidelity of the intervention, and participate in all aspects of the intervention * Not actively looking to make major lifestyle alterations during the study period with stable weight for 2 months (within 3%).

Exclusion criteria

* Type 1 diabetes or suspected type 1 diabetes (lean with polyuria, polydipsia, and weight loss with little response to metformin) * Secondary diabetes due to specific causes (e.g. monogenic syndromes, pancreatic surgery, and pancreatitis) * Diabetic Ketoacidosis hospitalization within last 6 months * Severe/major hypoglycemia in the last 3 months-severe/major hypoglycemia is defined as a hypoglycemic event in which patient requires assistance of another person to manage the episode * Glucocorticoid use (prednisone 2.5 mg/d or more or its equivalent) * History of intolerance or allergy to diet beverages or AS or phenylketonuria * Any condition that is known to affect the validity of the glycemic measures (Hba1c) * Major cardiovascular disease event or surgery within past 6 months * Gastrointestinal disease * Renal or liver disease * Current treatment for cancer * Those with major surgery planned or history of bariatric surgery * Antibiotic treatment (\> 6 days) within past 6 months * Currently pregnant (via self-report) or planning to become pregnant during study period; \<1 year postpartum and breast feeding * Current participation in another interventional clinical trial * Previous randomization in this study, * Heavy alcohol consumption (on average \>2 drinks/day for women and \>3 drinks/day for men) * Habitual consumer of SSB ≥ 1 serving / day (8 oz.) * Does not drink diet beverages * BMI \< 20.0 kg/m2

Design outcomes

Primary

MeasureTime frameDescription
HbA1cTime 0 (directly after 2-week run-in), 12, 24 weeksGlycated hemoglobin

Secondary

MeasureTime frameDescription
Time In RangeAll 14 day periods: Run-in (2-weeks, usual-baseline), weeks 11 and 12 (14 days), weeks 23 and 24 (14 days)Time in range is collected by a masked Continuous Glucose Monitor (CGM), which measures individual glucose levels every 15 minutes for two weeks via a sensor placed on the participants upper arm (underside). Time in Range is defined as the % of time each day with a glucose measure between 70-180 mg/dl. The range of CGM data for inclusion in this study will be 5 to 14 days, consistent with manufacturer's recommendations.
Glycemic VariabilityAll 14 day periods: Run-in (2-weeks, usual-baseline), weeks 11 and 12 (14 days), weeks 23 and 24 (14 days)Glycemic variability is collected by a masked Continuous Glucose Monitor (CGM), which measures individual glucose levels every 15 minutes for two weeks via a sensor placed on the participants upper arm (underside). Glycemic variability is defined as the Standard Deviation (SD) of the mean glucose during the wear period. The range of CGM data for inclusion in this study will be 5 to 14 days, consistent with manufacturer's recommendations.
Mean Glucose (mg/dl)All 14 day periods: Run-in (2-weeks, usual-baseline), weeks 11 and 12 (14 days), weeks 23 and 24 (14 days)A measure of the mean, 24 hour glucose concentration calculated across all recorded glucose readings during the wear period
Fasting GlucoseTime 0 (directly after 2-week run-in), 12, 24 weeksStandard (mg/dl) measure taken fasting (morning) during baseline, 12 weeks, 24 weeks
Fasting Insulin (Pmol/L)Time 0 (directly after 2-week run-in), week 12, week 24Standard lab measurement for fasting insulin assessment
FructosamineTime 0 (directly after 2-week run-in),12, 24 weeksFructosamine (umol/L) represents usual glycemia over the past 2-3 weeks, and is considered a valid marker of short term clinical glycemic patterns by the American Diabetes Association
Weight (kg)Time 0 (directly after 2-week run-in), 12, 24 weeksWeight measured on standardized scale in gown
Total Cholesterol (mg/dL)Time 0 (directly after 2-week run-in), 12, 24 weeksTotal cholesterol was measured as part of a lipid panel, a standard measurement for assessing clinical CVD risk
Kidney FunctionTime 0 (directly after 2-week run-in),12, 24 weekseGFR-Cystatin-C (estimated glomerular filtration rate) = mL/min/1.73 m\^2
Systolic Blood PressureTime 0 (directly after 2-week run-in),12, 24 weeksSystolic blood pressure (mmHg)
Diastolic Blood PressureTime 0 (directly after 2-week run-in), 12, 24 weeksStandard part of blood pressure measurement (mmHG)
Apolipoprotein-AITime 0 (directly after 2-week run-in), 12, 24 weeksApo-AI the major protein component of high density lipoprotein (HDL)
The Diabetes Health Profile (DHP-18)Time 0 (directly after 2-week run-in), 12, 24 weeksThe Diabetes Health Profile (DHP-18) is used to assess health related quality of life in diabetes across three domains (psychological distress, barriers to activity and disinhibited eating). Each item is scored on a 4-point scale, and the subscale scores are then rescaled to a 0-100 range, with higher scores indicating poorer well-being.
Fibrinogen (mg/dL)Time 0 (directly after 2-week run-in), 12, 24 weeksA protein involved in forming blood clots in the body
C-reactive ProteinTime 0 (directly after 2-week run-in), 12, 24 weeksbiomarker of inflammation
Aspartate Aminotransferase (AST) (U/L)Time 0 (directly after 2-week run-in), 12, 24 weeksAST (aspartate aminotransferase) is an enzyme that reflects liver function
Aminotransferase (ALT) (U/L)Time 0 (directly after 2-week run-in), 12, 24 weeksALT (alanine transaminase) is an enzyme, a protein that reflects liver function
Alkaline Phosphatase (ALKPhos ) (U/L)Time 0 (directly after 2-week run-in), 12, 24 weeksALP is an enzyme, a protein, that reflects liver function
Thyroid Stimulating Hormone (TSH)Time 0 (directly after 2-week run-in), 12, 24 weeksHormone measured in the blood with energy balance related role
Dietary Quality (Healthy Eating Index -HEI)Run-in period (2 weeks) - baseline, Week 1-12 (period 1), Week 13-24 (period 2).The Healthy Eating Index (HEI) is a measure of diet quality used to assess how well a set of foods aligns with key recommendations and dietary patterns published in the Dietary Guidelines for Americans (Dietary Guidelines). The overall HEI scores are made up of 13 components that reflect the different food groups and key recommendations in the Dietary Guidelines for Americans. The HEI is scored 0-100 (low to high), with higher scores representing greater reported intake of an overall dietary pattern aligning with USDA Dietary Guidelines. In the SODAS study, dietary intake was assessed by multiple unannounced 24-hour dietary recalls that occurred during the 2-week run-in period to assess usual habits (2 recalls over 2 weeks) and the active intervention (5 recalls over 24 weeks: 2 to 3 recalls during weeks 1-12 (period 1), and 2 to 3 recalls during weeks 13-24 (period 2). to measure any changes in diet quality. Scores during each period represent the average score of recalls.
Food Craving Inventory (FCI)Time 0 (directly after 2-week run-in), 12, 24 weeksThe FCI is a valid and reliable self-report measure of specific food cravings. The inventory consists of 4 factors or subscales measuring cravings for high fats (8 items), carbohydrates/starches (8 items), sweets (8 items), and fast food fats (4 items), and a total score is calculated by summing the subscales. Participants rate each food on a 5-point Likert scale ranging from 0 (never) to 4 (always/almost every day). We calculated the total score by summing the individual item responses in each subscale. Higher scores indicate more frequent cravings of the 28 items.
The Pittsburgh Sleep Quality Index (PSQI)Time 0 (directly after 2-week run-in), 12, 24 weeksThe Pittsburgh Sleep Quality Index (PSQI) is a self-report questionnaire that assesses sleep quality over a one-month time interval. Each component score of the PSQI ranges from 0 to 3, with 3 indicating the greatest dysfunction or disturbance. The seven component scores are then summed to obtain a global PSQI score, which ranges from 0 to 21. Higher scores indicate poorer sleep quality, with a score greater than 5 suggesting significant sleep difficulties
Medication Effect Score (MES)Time 0 (directly after 2-week run-in), 6, 12, 18, 24 weeksThe medication effect score (MES) is a measure of overall diabetes regimen intensity, and is based on the dosages of medications used and their potencies. The MES is calculated for each diabetes medication in a regimen using the following equation: (actual drug dose/maximum drug dose) × drug-specific adjustment factor. The adjustment factor equates to the expected decrease in HbA1c achieved by the drug as monotherapy. The MES presumes a linear relationship between medication dosage and HbA1c, and the sum of MES values attributed to individual medications represents the maximum A1c reduction that may be expected by the regimen. It is a continuous variable with range 0 (no medications), and the maximum achievable MES is patient specific and dependent on the total number of and dose of medications reported.
Therapeutic Intensity Score (TIS)Time 0 (directly after 2-week run-in), 6, 12, 18, 24 weeksThe therapeutic intensity score (TIS) is a summary measure that accounts for the number of medications and the relative doses a patient received to lower blood pressure. It is a continuous variable with range 0 (no medications), and the maximum achievable TIS is patient specific and dependent on the total number of antihypertensive medications reported.
Apolipoprotein BTime 0 (directly after 2-week run-in), 12, 24 weeksApoB levels indicate the atherogenic particle concentration independent of the particle cholesterol content

Countries

United States

Participant flow

Participants by arm

ArmCount
Diet Beverage
Participants will receive and consume three daily servings (24 ounces) of a non-caloric commercial diet beverage of their choice sweetened with FDA approved artificial sweeteners. Diet Beverage: Participants will receive and consume three daily servings (24 ounces) of a non-caloric commercial diet beverage of their choice sweetened with FDA approved artificial sweeteners.
91
Water
Participants will receive and consume three daily servings (24 ounces) of plain bottled/canned water in place of their usual commercial diet beverage. The water will be unflavored, unsweetened, non-caloric, and may be plain or sparkling. Participants randomized to consume water will be instructed to avoid intake of diet beverages. Water: Participants will receive and consume three daily servings (24 ounces) of plain bottled/canned water in place of their usual commercial diet beverage. The water will be unflavored, unsweetened, non-caloric, and may be plain or sparkling. Participants randomized to consume water will be instructed to avoid intake of diet beverages.
90
Total181

Withdrawals & dropouts

PeriodReasonFG000FG001
Overall StudyLost to Follow-up02

Baseline characteristics

CharacteristicWaterTotalDiet Beverage
Age, Continuous60.7 years
STANDARD_DEVIATION 10.1
60.1 years
STANDARD_DEVIATION 10.2
59.6 years
STANDARD_DEVIATION 10.4
Race/Ethnicity, Customized
African American or Black
2 Participants6 Participants4 Participants
Race/Ethnicity, Customized
Hispanic/Latino(a)
11 Participants20 Participants9 Participants
Race/Ethnicity, Customized
Other
10 Participants20 Participants10 Participants
Race/Ethnicity, Customized
White (non-Hispanic)
67 Participants135 Participants68 Participants
Region of Enrollment
United States
90 participants181 participants91 participants
Sex: Female, Male
Female
47 Participants94 Participants47 Participants
Sex: Female, Male
Male
43 Participants87 Participants44 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
0 / 910 / 90
other
Total, other adverse events
0 / 910 / 90
serious
Total, serious adverse events
0 / 910 / 90

Outcome results

Primary

HbA1c

Glycated hemoglobin

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Participants analyzed at each time point equals: baseline (all those randomized to arm), 12 weeks (reflects those who were not able to participate in visit with blood draw to to Covid-19 restrictions and dropouts), and 24 weeks (all ASB participants provided data, 87 water participants (2 dropouts/lost to follow up and 1 with sample not able to be analyzed)

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageHbA1cTime 07.19 Hba1c(%)Standard Deviation 1.1
Diet BeverageHbA1c12 weeks7.13 Hba1c(%)Standard Deviation 1.02
Diet BeverageHbA1c24 weeks7.14 Hba1c(%)Standard Deviation 1.19
WaterHbA1cTime 07.20 Hba1c(%)Standard Deviation 0.69
WaterHbA1c12 weeks7.43 Hba1c(%)Standard Deviation 1.02
WaterHbA1c24 weeks7.44 Hba1c(%)Standard Deviation 1.04
Secondary

Alkaline Phosphatase (ALKPhos ) (U/L)

ALP is an enzyme, a protein, that reflects liver function

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageAlkaline Phosphatase (ALKPhos ) (U/L)Week 2488.7 U/LStandard Deviation 41.9
Diet BeverageAlkaline Phosphatase (ALKPhos ) (U/L)Baseline88.0 U/LStandard Deviation 41.8
Diet BeverageAlkaline Phosphatase (ALKPhos ) (U/L)Week 1290.1 U/LStandard Deviation 42.9
WaterAlkaline Phosphatase (ALKPhos ) (U/L)Week 2483.4 U/LStandard Deviation 24.6
WaterAlkaline Phosphatase (ALKPhos ) (U/L)Baseline83.3 U/LStandard Deviation 24.7
WaterAlkaline Phosphatase (ALKPhos ) (U/L)Week 1282.6 U/LStandard Deviation 24.5
Secondary

Aminotransferase (ALT) (U/L)

ALT (alanine transaminase) is an enzyme, a protein that reflects liver function

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageAminotransferase (ALT) (U/L)Week 2426.6 U/LStandard Deviation 15
Diet BeverageAminotransferase (ALT) (U/L)Week 1226.8 U/LStandard Deviation 15.8
Diet BeverageAminotransferase (ALT) (U/L)Baseline26.6 U/LStandard Deviation 14.5
WaterAminotransferase (ALT) (U/L)Week 1227.1 U/LStandard Deviation 23.2
WaterAminotransferase (ALT) (U/L)Week 2426.3 U/LStandard Deviation 19
WaterAminotransferase (ALT) (U/L)Baseline28.2 U/LStandard Deviation 21.6
Secondary

Apolipoprotein-AI

Apo-AI the major protein component of high density lipoprotein (HDL)

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageApolipoprotein-AIBaseline146.6 mg/dLStandard Deviation 24.3
Diet BeverageApolipoprotein-AIWeek 12148.0 mg/dLStandard Deviation 25.5
Diet BeverageApolipoprotein-AIWeek 24147.2 mg/dLStandard Deviation 22.5
WaterApolipoprotein-AIBaseline150.3 mg/dLStandard Deviation 23.3
WaterApolipoprotein-AIWeek 12151.0 mg/dLStandard Deviation 23.7
WaterApolipoprotein-AIWeek 24152.7 mg/dLStandard Deviation 24.2
Secondary

Apolipoprotein B

ApoB levels indicate the atherogenic particle concentration independent of the particle cholesterol content

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageApolipoprotein BBaseline88.0 mg/dLStandard Deviation 21.1
Diet BeverageApolipoprotein BWeek 1288.0 mg/dLStandard Deviation 23.1
Diet BeverageApolipoprotein BWeek 2485.4 mg/dLStandard Deviation 21.3
WaterApolipoprotein BBaseline85.0 mg/dLStandard Deviation 24
WaterApolipoprotein BWeek 1286.6 mg/dLStandard Deviation 25.1
WaterApolipoprotein BWeek 2486.8 mg/dLStandard Deviation 25.8
Secondary

Aspartate Aminotransferase (AST) (U/L)

AST (aspartate aminotransferase) is an enzyme that reflects liver function

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageAspartate Aminotransferase (AST) (U/L)Baseline21.9 U/LStandard Deviation 9.5
Diet BeverageAspartate Aminotransferase (AST) (U/L)Week 1222.5 U/LStandard Deviation 11.3
Diet BeverageAspartate Aminotransferase (AST) (U/L)Week 2421.9 U/LStandard Deviation 8.7
WaterAspartate Aminotransferase (AST) (U/L)Baseline24.9 U/LStandard Deviation 15.2
WaterAspartate Aminotransferase (AST) (U/L)Week 1223.9 U/LStandard Deviation 15.4
WaterAspartate Aminotransferase (AST) (U/L)Week 2423.9 U/LStandard Deviation 13
Secondary

C-reactive Protein

biomarker of inflammation

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number of measurements over time reflect ability to collect data during covid-19 epidemic, participant dropout, and removing 3 outliers (CRP\>30)

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageC-reactive ProteinWeek 123.60 mg/LStandard Deviation 3.81
Diet BeverageC-reactive ProteinBaseline3.93 mg/LStandard Deviation 3.73
Diet BeverageC-reactive ProteinWeek 243.85 mg/LStandard Deviation 4.42
WaterC-reactive ProteinBaseline3.54 mg/LStandard Deviation 3.27
WaterC-reactive ProteinWeek 123.56 mg/LStandard Deviation 3.12
WaterC-reactive ProteinWeek 243.53 mg/LStandard Deviation 3.35
Secondary

Diastolic Blood Pressure

Standard part of blood pressure measurement (mmHG)

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageDiastolic Blood PressureBaseline78.5 mmHGStandard Deviation 7.7
Diet BeverageDiastolic Blood PressureWeek 1278.3 mmHGStandard Deviation 8.4
Diet BeverageDiastolic Blood PressureWeek 2477.7 mmHGStandard Deviation 8.6
WaterDiastolic Blood PressureBaseline76.6 mmHGStandard Deviation 7.4
WaterDiastolic Blood PressureWeek 1275.4 mmHGStandard Deviation 7.6
WaterDiastolic Blood PressureWeek 2475.6 mmHGStandard Deviation 7.2
Secondary

Dietary Quality (Healthy Eating Index -HEI)

The Healthy Eating Index (HEI) is a measure of diet quality used to assess how well a set of foods aligns with key recommendations and dietary patterns published in the Dietary Guidelines for Americans (Dietary Guidelines). The overall HEI scores are made up of 13 components that reflect the different food groups and key recommendations in the Dietary Guidelines for Americans. The HEI is scored 0-100 (low to high), with higher scores representing greater reported intake of an overall dietary pattern aligning with USDA Dietary Guidelines. In the SODAS study, dietary intake was assessed by multiple unannounced 24-hour dietary recalls that occurred during the 2-week run-in period to assess usual habits (2 recalls over 2 weeks) and the active intervention (5 recalls over 24 weeks: 2 to 3 recalls during weeks 1-12 (period 1), and 2 to 3 recalls during weeks 13-24 (period 2). to measure any changes in diet quality. Scores during each period represent the average score of recalls.

Time frame: Run-in period (2 weeks) - baseline, Week 1-12 (period 1), Week 13-24 (period 2).

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageDietary Quality (Healthy Eating Index -HEI)Period 154.8 units on a scaleStandard Deviation 13.2
Diet BeverageDietary Quality (Healthy Eating Index -HEI)Baseline54.7 units on a scaleStandard Deviation 12
Diet BeverageDietary Quality (Healthy Eating Index -HEI)Period 253.3 units on a scaleStandard Deviation 12.3
WaterDietary Quality (Healthy Eating Index -HEI)Baseline53.7 units on a scaleStandard Deviation 13.6
WaterDietary Quality (Healthy Eating Index -HEI)Period 153.1 units on a scaleStandard Deviation 12.7
WaterDietary Quality (Healthy Eating Index -HEI)Period 251.7 units on a scaleStandard Deviation 13.4
Secondary

Fasting Glucose

Standard (mg/dl) measure taken fasting (morning) during baseline, 12 weeks, 24 weeks

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to invalid lab sample, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageFasting GlucoseBaseline147.5 mg/dlStandard Deviation 40
Diet BeverageFasting GlucoseWeek 12146.2 mg/dlStandard Deviation 41.8
Diet BeverageFasting GlucoseWeek 24149.2 mg/dlStandard Deviation 44
WaterFasting GlucoseBaseline147.6 mg/dlStandard Deviation 36.2
WaterFasting GlucoseWeek 12149.3 mg/dlStandard Deviation 44.2
WaterFasting GlucoseWeek 24153.7 mg/dlStandard Deviation 51.3
Secondary

Fasting Insulin (Pmol/L)

Standard lab measurement for fasting insulin assessment

Time frame: Time 0 (directly after 2-week run-in), week 12, week 24

Population: Number analyzed at different time points reflects attrition due to invalid samples, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageFasting Insulin (Pmol/L)Baseline128.0 pmol/LStandard Deviation 97.1
Diet BeverageFasting Insulin (Pmol/L)Week 12135.7 pmol/LStandard Deviation 141
Diet BeverageFasting Insulin (Pmol/L)Week 24143.5 pmol/LStandard Deviation 145.4
WaterFasting Insulin (Pmol/L)Baseline138.5 pmol/LStandard Deviation 134.1
WaterFasting Insulin (Pmol/L)Week 12134.2 pmol/LStandard Deviation 145
WaterFasting Insulin (Pmol/L)Week 24144.2 pmol/LStandard Deviation 144
Secondary

Fibrinogen (mg/dL)

A protein involved in forming blood clots in the body

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageFibrinogen (mg/dL)Baseline265.0 mg/dLStandard Deviation 51.9
Diet BeverageFibrinogen (mg/dL)Week 12268.7 mg/dLStandard Deviation 55.7
Diet BeverageFibrinogen (mg/dL)Week 24270.4 mg/dLStandard Deviation 53.3
WaterFibrinogen (mg/dL)Baseline269.3 mg/dLStandard Deviation 55.1
WaterFibrinogen (mg/dL)Week 12263.1 mg/dLStandard Deviation 50.9
WaterFibrinogen (mg/dL)Week 24265.4 mg/dLStandard Deviation 43.2
Secondary

Food Craving Inventory (FCI)

The FCI is a valid and reliable self-report measure of specific food cravings. The inventory consists of 4 factors or subscales measuring cravings for high fats (8 items), carbohydrates/starches (8 items), sweets (8 items), and fast food fats (4 items), and a total score is calculated by summing the subscales. Participants rate each food on a 5-point Likert scale ranging from 0 (never) to 4 (always/almost every day). We calculated the total score by summing the individual item responses in each subscale. Higher scores indicate more frequent cravings of the 28 items.

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageFood Craving Inventory (FCI)Week 1229.8 units on a scaleStandard Deviation 15.8
Diet BeverageFood Craving Inventory (FCI)Baseline33.9 units on a scaleStandard Deviation 15.1
Diet BeverageFood Craving Inventory (FCI)Week 2427.1 units on a scaleStandard Deviation 15.9
WaterFood Craving Inventory (FCI)Baseline35.4 units on a scaleStandard Deviation 14.8
WaterFood Craving Inventory (FCI)Week 1230.9 units on a scaleStandard Deviation 15.4
WaterFood Craving Inventory (FCI)Week 2431.2 units on a scaleStandard Deviation 14.3
Secondary

Fructosamine

Fructosamine (umol/L) represents usual glycemia over the past 2-3 weeks, and is considered a valid marker of short term clinical glycemic patterns by the American Diabetes Association

Time frame: Time 0 (directly after 2-week run-in),12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to invalid samples, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageFructosamineBaseline273.2 umol/LStandard Deviation 44.8
Diet BeverageFructosamineWeek 12272.1 umol/LStandard Deviation 43.5
Diet BeverageFructosamineWeek 24273.0 umol/LStandard Deviation 51.3
WaterFructosamineBaseline285.5 umol/LStandard Deviation 42.4
WaterFructosamineWeek 12286.6 umol/LStandard Deviation 47.2
WaterFructosamineWeek 24291.6 umol/LStandard Deviation 45.8
Secondary

Glycemic Variability

Glycemic variability is collected by a masked Continuous Glucose Monitor (CGM), which measures individual glucose levels every 15 minutes for two weeks via a sensor placed on the participants upper arm (underside). Glycemic variability is defined as the Standard Deviation (SD) of the mean glucose during the wear period. The range of CGM data for inclusion in this study will be 5 to 14 days, consistent with manufacturer's recommendations.

Time frame: All 14 day periods: Run-in (2-weeks, usual-baseline), weeks 11 and 12 (14 days), weeks 23 and 24 (14 days)

Population: Number analyzed at different time points reflects attrition due to device failure, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageGlycemic VariabilityBaseline39.6 SD of mean glucose (mg/dl)Standard Deviation 14.7
Diet BeverageGlycemic VariabilityWeeks 11-1240.0 SD of mean glucose (mg/dl)Standard Deviation 12.9
Diet BeverageGlycemic VariabilityWeeks 23-2440.8 SD of mean glucose (mg/dl)Standard Deviation 14.9
WaterGlycemic VariabilityBaseline42.0 SD of mean glucose (mg/dl)Standard Deviation 13.1
WaterGlycemic VariabilityWeeks 11-1244.9 SD of mean glucose (mg/dl)Standard Deviation 15.4
WaterGlycemic VariabilityWeeks 23-2445.8 SD of mean glucose (mg/dl)Standard Deviation 16.3
Secondary

Kidney Function

eGFR-Cystatin-C (estimated glomerular filtration rate) = mL/min/1.73 m\^2

Time frame: Time 0 (directly after 2-week run-in),12, 24 weeks

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageKidney FunctionWeek 2482.0 eGFR-Cystatin-C (mL/min/1.73 m^2)Standard Deviation 20.7
Diet BeverageKidney FunctionBaseline83.2 eGFR-Cystatin-C (mL/min/1.73 m^2)Standard Deviation 21.1
Diet BeverageKidney FunctionWeek 1282.8 eGFR-Cystatin-C (mL/min/1.73 m^2)Standard Deviation 20.5
WaterKidney FunctionBaseline81.5 eGFR-Cystatin-C (mL/min/1.73 m^2)Standard Deviation 20
WaterKidney FunctionWeek 1280.8 eGFR-Cystatin-C (mL/min/1.73 m^2)Standard Deviation 19.5
WaterKidney FunctionWeek 2480.9 eGFR-Cystatin-C (mL/min/1.73 m^2)Standard Deviation 20.7
Secondary

Mean Glucose (mg/dl)

A measure of the mean, 24 hour glucose concentration calculated across all recorded glucose readings during the wear period

Time frame: All 14 day periods: Run-in (2-weeks, usual-baseline), weeks 11 and 12 (14 days), weeks 23 and 24 (14 days)

Population: Number analyzed at different time points reflects attrition due to device failure, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageMean Glucose (mg/dl)Baseline147.3 mg/dlStandard Deviation 42.1
Diet BeverageMean Glucose (mg/dl)Weeks 11-12149.4 mg/dlStandard Deviation 46.4
Diet BeverageMean Glucose (mg/dl)Weeks 23-24153.1 mg/dlStandard Deviation 50.7
WaterMean Glucose (mg/dl)Weeks 23-24162.3 mg/dlStandard Deviation 47.3
WaterMean Glucose (mg/dl)Baseline151.4 mg/dlStandard Deviation 33.1
WaterMean Glucose (mg/dl)Weeks 11-12161.2 mg/dlStandard Deviation 50.5
Secondary

Medication Effect Score (MES)

The medication effect score (MES) is a measure of overall diabetes regimen intensity, and is based on the dosages of medications used and their potencies. The MES is calculated for each diabetes medication in a regimen using the following equation: (actual drug dose/maximum drug dose) × drug-specific adjustment factor. The adjustment factor equates to the expected decrease in HbA1c achieved by the drug as monotherapy. The MES presumes a linear relationship between medication dosage and HbA1c, and the sum of MES values attributed to individual medications represents the maximum A1c reduction that may be expected by the regimen. It is a continuous variable with range 0 (no medications), and the maximum achievable MES is patient specific and dependent on the total number of and dose of medications reported.

Time frame: Time 0 (directly after 2-week run-in), 6, 12, 18, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageMedication Effect Score (MES)Week 61.64 units on a scaleStandard Deviation 1.06
Diet BeverageMedication Effect Score (MES)Week 181.64 units on a scaleStandard Deviation 1.06
Diet BeverageMedication Effect Score (MES)Week 121.63 units on a scaleStandard Deviation 1.05
Diet BeverageMedication Effect Score (MES)Week 241.64 units on a scaleStandard Deviation 1.06
Diet BeverageMedication Effect Score (MES)Week 01.64 units on a scaleStandard Deviation 1.05
WaterMedication Effect Score (MES)Week 242.01 units on a scaleStandard Deviation 1.36
WaterMedication Effect Score (MES)Week 02.09 units on a scaleStandard Deviation 1.4
WaterMedication Effect Score (MES)Week 62.05 units on a scaleStandard Deviation 1.36
WaterMedication Effect Score (MES)Week 122.03 units on a scaleStandard Deviation 1.33
WaterMedication Effect Score (MES)Week 182.02 units on a scaleStandard Deviation 1.35
Secondary

Systolic Blood Pressure

Systolic blood pressure (mmHg)

Time frame: Time 0 (directly after 2-week run-in),12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageSystolic Blood PressureBaseline136.3 mmHGStandard Deviation 15
Diet BeverageSystolic Blood PressureWeek 12135.5 mmHGStandard Deviation 14.8
Diet BeverageSystolic Blood PressureWeek 24135.6 mmHGStandard Deviation 15.6
WaterSystolic Blood PressureBaseline131.9 mmHGStandard Deviation 15
WaterSystolic Blood PressureWeek 12129.5 mmHGStandard Deviation 13.1
WaterSystolic Blood PressureWeek 24129.6 mmHGStandard Deviation 14.8
Secondary

The Diabetes Health Profile (DHP-18)

The Diabetes Health Profile (DHP-18) is used to assess health related quality of life in diabetes across three domains (psychological distress, barriers to activity and disinhibited eating). Each item is scored on a 4-point scale, and the subscale scores are then rescaled to a 0-100 range, with higher scores indicating poorer well-being.

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageThe Diabetes Health Profile (DHP-18)Baseline79.6 units on a scaleStandard Deviation 11.1
Diet BeverageThe Diabetes Health Profile (DHP-18)Week 2480.6 units on a scaleStandard Deviation 11.1
Diet BeverageThe Diabetes Health Profile (DHP-18)Week 1279.8 units on a scaleStandard Deviation 9.98
WaterThe Diabetes Health Profile (DHP-18)Week 2478.6 units on a scaleStandard Deviation 11.7
WaterThe Diabetes Health Profile (DHP-18)Baseline77.9 units on a scaleStandard Deviation 11.1
WaterThe Diabetes Health Profile (DHP-18)Week 1278.1 units on a scaleStandard Deviation 10.9
Secondary

The Pittsburgh Sleep Quality Index (PSQI)

The Pittsburgh Sleep Quality Index (PSQI) is a self-report questionnaire that assesses sleep quality over a one-month time interval. Each component score of the PSQI ranges from 0 to 3, with 3 indicating the greatest dysfunction or disturbance. The seven component scores are then summed to obtain a global PSQI score, which ranges from 0 to 21. Higher scores indicate poorer sleep quality, with a score greater than 5 suggesting significant sleep difficulties

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageThe Pittsburgh Sleep Quality Index (PSQI)Baseline6.0 units on a scaleStandard Deviation 2.7
Diet BeverageThe Pittsburgh Sleep Quality Index (PSQI)Week 126.0 units on a scaleStandard Deviation 3.1
Diet BeverageThe Pittsburgh Sleep Quality Index (PSQI)Week 245.9 units on a scaleStandard Deviation 2.9
WaterThe Pittsburgh Sleep Quality Index (PSQI)Baseline6.8 units on a scaleStandard Deviation 3
WaterThe Pittsburgh Sleep Quality Index (PSQI)Week 126.5 units on a scaleStandard Deviation 3.1
WaterThe Pittsburgh Sleep Quality Index (PSQI)Week 247.1 units on a scaleStandard Deviation 3.2
Secondary

Therapeutic Intensity Score (TIS)

The therapeutic intensity score (TIS) is a summary measure that accounts for the number of medications and the relative doses a patient received to lower blood pressure. It is a continuous variable with range 0 (no medications), and the maximum achievable TIS is patient specific and dependent on the total number of antihypertensive medications reported.

Time frame: Time 0 (directly after 2-week run-in), 6, 12, 18, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageTherapeutic Intensity Score (TIS)Week 60.40 score on a scaleStandard Deviation 0.46
Diet BeverageTherapeutic Intensity Score (TIS)Week 180.41 score on a scaleStandard Deviation 0.49
Diet BeverageTherapeutic Intensity Score (TIS)Week 120.42 score on a scaleStandard Deviation 0.49
Diet BeverageTherapeutic Intensity Score (TIS)Week 240.41 score on a scaleStandard Deviation 0.49
Diet BeverageTherapeutic Intensity Score (TIS)Week 00.41 score on a scaleStandard Deviation 0.51
WaterTherapeutic Intensity Score (TIS)Week 240.42 score on a scaleStandard Deviation 0.45
WaterTherapeutic Intensity Score (TIS)Week 00.42 score on a scaleStandard Deviation 0.43
WaterTherapeutic Intensity Score (TIS)Week 60.41 score on a scaleStandard Deviation 0.43
WaterTherapeutic Intensity Score (TIS)Week 120.42 score on a scaleStandard Deviation 0.44
WaterTherapeutic Intensity Score (TIS)Week 180.43 score on a scaleStandard Deviation 0.45
Secondary

Thyroid Stimulating Hormone (TSH)

Hormone measured in the blood with energy balance related role

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to data collection, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageThyroid Stimulating Hormone (TSH)Baseline2.45 µU/mLStandard Deviation 1.58
Diet BeverageThyroid Stimulating Hormone (TSH)Week 122.65 µU/mLStandard Deviation 3.32
Diet BeverageThyroid Stimulating Hormone (TSH)Week 242.36 µU/mLStandard Deviation 1.66
WaterThyroid Stimulating Hormone (TSH)Baseline2.17 µU/mLStandard Deviation 1.34
WaterThyroid Stimulating Hormone (TSH)Week 122.32 µU/mLStandard Deviation 1.91
WaterThyroid Stimulating Hormone (TSH)Week 242.27 µU/mLStandard Deviation 1.47
Secondary

Time In Range

Time in range is collected by a masked Continuous Glucose Monitor (CGM), which measures individual glucose levels every 15 minutes for two weeks via a sensor placed on the participants upper arm (underside). Time in Range is defined as the % of time each day with a glucose measure between 70-180 mg/dl. The range of CGM data for inclusion in this study will be 5 to 14 days, consistent with manufacturer's recommendations.

Time frame: All 14 day periods: Run-in (2-weeks, usual-baseline), weeks 11 and 12 (14 days), weeks 23 and 24 (14 days)

Population: Number analyzed at different time points reflects attrition due to device failure, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageTime In RangeBaseline76.0 % Time in RangeStandard Deviation 19.2
Diet BeverageTime In RangeWeek 11-1275.2 % Time in RangeStandard Deviation 22.6
Diet BeverageTime In RangeWeek 23-2472.8 % Time in RangeStandard Deviation 23.2
WaterTime In RangeBaseline72.3 % Time in RangeStandard Deviation 20.9
WaterTime In RangeWeek 11-1266.9 % Time in RangeStandard Deviation 26.2
WaterTime In RangeWeek 23-2464.7 % Time in RangeStandard Deviation 26.5
Secondary

Total Cholesterol (mg/dL)

Total cholesterol was measured as part of a lipid panel, a standard measurement for assessing clinical CVD risk

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points reflects attrition due to invalid samples, COVID-19 restrictions, and 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageTotal Cholesterol (mg/dL)Baseline165.9 mg/dlStandard Deviation 41.3
Diet BeverageTotal Cholesterol (mg/dL)Week 12164.8 mg/dlStandard Deviation 39.5
Diet BeverageTotal Cholesterol (mg/dL)Week 24161.1 mg/dlStandard Deviation 36.4
WaterTotal Cholesterol (mg/dL)Baseline163.6 mg/dlStandard Deviation 40.9
WaterTotal Cholesterol (mg/dL)Week 12163.6 mg/dlStandard Deviation 40.3
WaterTotal Cholesterol (mg/dL)Week 24163.4 mg/dlStandard Deviation 40.1
Secondary

Weight (kg)

Weight measured on standardized scale in gown

Time frame: Time 0 (directly after 2-week run-in), 12, 24 weeks

Population: Number analyzed at different time points 2 participants who withdrew after baseline

ArmMeasureGroupValue (MEAN)Dispersion
Diet BeverageWeight (kg)Baseline102.1 kgStandard Deviation 21.1
Diet BeverageWeight (kg)Week 12101.5 kgStandard Deviation 20.4
Diet BeverageWeight (kg)Week 24101.2 kgStandard Deviation 20.6
WaterWeight (kg)Baseline96.1 kgStandard Deviation 21.5
WaterWeight (kg)Week 1295.8 kgStandard Deviation 21.8
WaterWeight (kg)Week 2495.9 kgStandard Deviation 21.9

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026