Clinical trial NCT04226911: Sweeteners and Sweetness Enhancers: Prolonged Effects on Health, Obesity and Safety
Official title: Sweeteners and Sweetness Enhancers: Prolonged Effects on Health, Obesity and Safety
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Obesity
Lead sponsor: University of Copenhagen
Sponsor class: OTHER
Collaborators: name: Harokopio University
name: University of Navarra
name: University of Liverpool
name: Maastricht University
name: University of Leeds
name: Wageningen University
name: European Clinical Research Infrastructure Network
name: University of Surrey
name: Bioiatriki Idiotiko Polyiatreio Iatpikh Anonymos Etairia
name: NetUnion SARL
name: Pectolite GMBH
First posted: 2020-01-13
Enrollment: 379
Sex: ALL
Minimum age (years): 6
Maximum age (years): 65
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: PREVENTION

Brief summary: The aim of this randomised controlled trial (RCT) is to investigate if prolonged consumption of sweetener and sweetness enhancers (S\&SEs) within a healthy diet approach will improve weight loss maintenance and obesity related risk factors, and affect safety markers, compared to sugar.

We hypothesize, that:

* Prolonged use of S\&SEs in beverages and food matrices will result in improved body weight control because S\&SEs will increase palatability of the diet and thereby increase compliance to the recommendations for a healthy diet.
* There will be no safety concerns using S\&SEs in the long term.

Overweight/obese adults and families where at least one adult (both gender) and one child (both gender) are overweight/obese will be recruited. The majority of measurements will only be conducted in the adult population and some measurement will only be done in sub-groups. The intervention will be performed in four countries: Denmark, Greece, Spain and the Netherlands.

The goal is approximately 370 participants - 330 adults (18-65 years of age) and 40 children (6-12 years of age) - will be recruited for the study. All adult participants are first treated by a low energy diet (LED) for 2 months with the aim to reduce body weight (minimum 5% weight loss (WL)), whereas children are treated separately with a conventional weight maintenance (WM) diet, without a specific aim for absolute WL.

The participants - both adults and families - are randomized into two different diet interventions for 10 months with or without inclusion of S\&SEs products (foods and drinks). For adults, this period aims at preventing weight re-gain and for children maintaining body mass index (BMI)-for-age. The participants will receive food exchange lists and will be guided by dieticians. The randomization will be stratified by age, sex and BMI. Adults (not participating with children) belonging to the same household and all members of a family will be assigned the same intervention - the randomization will here solely be based on the oldest adult in the family/household.

The adult participants are weighed at months 0, 0.5 and 1, and if needed at month 1.5. They are supervised during the WL period at months 0 and 1, and if needed at months 0.5 and 1.5, and throughout the WM period at months 2, 4, 6, 9 and 12. Children will follow a similar, but less strict time schedule (their participation is preferred but not required for all dietician meetings).

The main assessment points are the clinical investigation days (CIDs) at month 0 (baseline, start of the WL period), 2 (end of the WL period/start of randomized intervention), 6 (6 months from baseline) and 12 (1 year from baseline).


Eligibility criteria: Inclusion criteria for adults:

* Age: 18-65 years.
* BMI: ≥25.0 kg/m2 (no upper limit). For women: Use of contraceptive methods and not wishing/planning to become pregnant in the 1 year of the intervention study.
* Regular consumption of sugar-containing/sugar-sweetened products.
* Able to participate in CIDs and dietician meetings during normal working hours.
* Motivation and willingness to be randomized to any of the two groups and to do the best to follow the given protocol.

Inclusion criteria for children:

* Age: 6-12 years.
* BMI-for-age: \>85th percentile (no upper limit).
* Able to participate in CIDs during normal working hours.
* Motivation and willingness to be randomized to any of the two groups and to do the best to follow the given protocol.

Exclusion criteria for adults:

* Weight change (increase or decrease) \>5% during the past 2 months prior to the study.
* Surgical treatment of obesity.
* Blood donation \< 3 month prior to study.
* Change in smoking habits during the last month. Smoking is allowed provided subjects have not recently changed habits. However, smoking status is monitored throughout the study and used as a confounding variable.
* Regularly drinking \>21 alcoholic units per week (men), or \>14 alcoholic units/week (women).
* Intensive physical training (\>10 hours of per week).
* Self-reported eating disorders.
* Intolerance and allergies expected to interfere with the study.
* Self-reported drug abuse within the previous 12 months.
* Night- or shift work that ends later than 11 PM.
* For women: Pregnancy, lactation.
* Persons who do not have access to either (mobile) phone or internet (this is necessary when being contacted by the study personnel during the study).
* Insufficient communication with national language.
* Inability, physically or mentally, to comply with the procedures required by the study protocol as evaluated by the daily study manager, site-PI, PI or clinical responsible
* Participant's general condition contraindicates continuing the study as evaluated by the daily study manager, site-PI, PI or clinical responsible.
* Simultaneous participation in other clinical intervention studies.

Medical conditions as known by the persons:

* Diagnosed diabetes mellitus.
* Medical history of CVD (e.g. current angina; myocardial infarction or stroke within the past 6 months; heart failure; symptomatic peripheral vascular disease).
* Systolic blood pressure above 160 mmHg and/or diastolic blood pressure above 100 mmHg (measured at screening) whether on or off treatment for hypertension.
* Significant liver disease, e.g. cirrhosis (fatty liver disease allowed).
* Malignancy which is currently active or in remission for less than five years after last treatment (local basal and squamous cell skin cancer allowed).
* Active inflammatory bowel disease, celiac disease, chronic pancreatitis or other disorder potentially causing malabsorption.
* Thyroid diseases, except those on Levothyroxine treatment of hypothyroidism if the person has been on a stable dose for at least 3 months.
* Psychiatric illness (e.g. major depression, bipolar disorders).

Medication:

* Use currently or within the previous 3 months of prescription or over the counter medication that has the potential of affecting body weight incl. food supplements. Except: low dose antidepressants if they, in the judgement of the daily study manager, site-PI, PI or clinical responsible, do not affect weight or participation to the study protocol. Levothyroxine for treatment of hypothyroidism is allowed if the person has been on a stable dose for at least 3 months.
* Cholesterol or blood pressure lowering medication, if the dose has changed during the last 3 months (i.e. the medication is allowed if the participant has been on a stable dose for at least 3 months).

Laboratory screening:

If all of the above criteria are satisfied, the adult participant is eligible for a laboratory screening. A blood sample is collected and immediately analysed for glucose and haemoglobin concentrations (Haemocue).

* Glucose ≥ 7.0 mmol/L.
* Haemoglobin concentration below local laboratory reference values (i.e. anaemia).
* Or any other significant abnormality on these tests which in the investigators opinion may be clinically significant and require further assessment.

After WL period (CID2, Month 2):

Failure to reach at least 5% weight reduction during the WL period (Months 0-2). This leads to exclusion from the WM intervention

Exclusion criteria for children:

* Intensive physical training (\>10 hours of per week).
* Self-reported eating disorders.
* Intolerance and allergies expected to interfere with the study.
* Insufficient communication with national language.
* Inability, physically or mentally, to comply with the procedures required by the study protocol as evaluated by the daily study manager, site-PI, PI or clinical responsible.
* Subject's general condition contraindicates continuing the study as evaluated by the daily study manager, principal investigator or clinical responsible.
* Simultaneous participation in other clinical intervention studies.

Medical conditions as known by the child and the representative adult:

* Diagnosed diabetes mellitus.
* Other diseases that may influence the study outcomes as evaluated by the daily study manager, site-PI, PI or clinical responsible.

Medication:

* Use currently or within the previous 3 months of prescription or over the counter medication that has the potential of affecting body weight.

Primary outcomes:
measure: Change in body weight (adults)
timeFrame: Up to 1 year.
measure: Changes in gut microbiota composition (adults)
timeFrame: Up to 1 year.
Secondary outcomes:
measure: Change in BMI-for-age z-score (children)
timeFrame: Up to 1 year.
measure: Changes in waist and hip circumferences (adults and children)
timeFrame: Up to 1 year.
measure: Change in body composition (adults and children)
timeFrame: Up to 1 year.
measure: Change in blood pressure and heart rate (adults and children)
timeFrame: Up to 1 year.
measure: Change in glucose (adults and children)
timeFrame: Up to 1 year.
measure: Change in hemoglobin A1c (adults and children)
timeFrame: Up to 1 year.
measure: Change in alanine aminotransferase (ALT) (adults and children)
timeFrame: Up to 1 year.
measure: Change in aspartate aminotransferase (AST) (adults and children)
timeFrame: Up to 1 year.
measure: Change in insulinemia (adults and children)
timeFrame: Up to 1 year.
measure: Change in lipidemia (adults and children)
timeFrame: Up to 1 year.
measure: Change C-reactive protein (CPR) (adults and children)
timeFrame: Up to 1 year.
measure: Allergenicity by serum immunoglobulin level (adults and children)
timeFrame: Up to 1 year.
measure: Allergenicity by a skin prick test (adults)
timeFrame: Up to 1 year.
measure: Allergenicity by a questionnaire (adults and children)
timeFrame: Up to 1 year.
measure: Concomitant medication (adults and children)
timeFrame: Up to 1 year.
measure: Adverse events (adults and children)
timeFrame: Up to 1 year.
measure: Change in liver fat and lipid composition (adults)
timeFrame: Up to 1 year.
measure: Change in ghrelin (adults)
timeFrame: Up to 1 year.
measure: Change in cholecystokinin (adults)
timeFrame: Up to 1 year.
measure: Change in glucagon-like peptide-1 (GLP-1) (adults)
timeFrame: Up to 1 year.
measure: Change in FGF21 (adults)
timeFrame: Up to 1 year.
measure: Changes in gut microbiota composition (children)
timeFrame: Up to 1 year.
measure: Markers of adipogenesis (adults)
timeFrame: Up to 1 year.
measure: Lipolysis (adults)
timeFrame: Up to 1 year.
measure: Fat cell size (adults)
timeFrame: Up to 1 year.
measure: Inflammation markers (adults)
timeFrame: Up to 1 year.
measure: Insulin sensitivity (adults)
timeFrame: Up to 1 year.
measure: Glucose tolerance (adults)
timeFrame: Up to 1 year.
measure: Changes in gut-microbial composition in response to specific S&SEs in vitro (adults)
timeFrame: Only baseline feces samples will be used
measure: Changes in gut-microbial functionality in response to S&SEs in vitro (adults)
timeFrame: Up to 1 year.
measure: Baseline and postprandial energy expenditure (adults)
timeFrame: Up to 6 months.
measure: Baseline and postprandial substrate oxidation (adults)
timeFrame: Up to 6 months.
measure: Baseline and postprandial appetite (adults)
timeFrame: Up to 6 months.
measure: Baseline and postprandial blood samples (adults)
timeFrame: Up to 6 months.
Other outcomes:
measure: Food preferences (adults and children)
timeFrame: Up to 1 year.
measure: Perception of S&SEs (adults)
timeFrame: Up to 1 year.
measure: Cravings (adults)
timeFrame: Up to 1 year.
measure: Subjective appetite sensation (adults)
timeFrame: Up to 1 year.
measure: Perception and evaluation of the weight maintenance intervention (adults)
timeFrame: Up to 1 year.
measure: Dietary restraint and disinhibition (adults and children)
timeFrame: Up to 1 year.
measure: Dietary intake (adults and children)
timeFrame: Up to 1 year.
measure: Biomarkers (adults)
timeFrame: Up to 1 year.
measure: Physical activity (adults and children)
timeFrame: Up to 1 year.
measure: Brain reward activity (adults)
timeFrame: Up to 1 year.
measure: Puberty (children)
timeFrame: Up to 1 year.
Locations:
city: Frederiksberg
country: Denmark
facility: Department of Nutrition, Exercise and Sports
city: Kallithea-Athens
country: Greece
facility: Harokopio University
city: Maastricht
country: Netherlands
facility: University of Maastricht
city: Pamplona
country: Spain
facility: University of Navarra
Study officials:
References:
citation: Kjolbaek L, Manios Y, Blaak EE, Martinez JA, Feskens EJM, Finlayson G, Andersen SSH, Reppas K, Navas-Carretero S, Adam TC, Hodgkins CE, Del Alamo M, Lam T, Moshoyiannis H, Halford JCG, Harrold JA, Raben A. Protocol for a multicentre, parallel, randomised, controlled trial on the effect of sweeteners and sweetness enhancers on health, obesity and safety in overweight adults and children: the SWEET project. BMJ Open. 2022 Oct 12;12(10):e061075. doi: 10.1136/bmjopen-2022-061075.