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NCT Number: NCT06321432

Intensive Weight Loss Intervention Versus Usual Care for Adults With Obesity

In this trial, the aim is to assess the clinical benefits and harms, as well as cost-effectiveness of an intensive weight loss (IWL) intervention that includes total dietary replacements, behavioural support and weight-loss medication compared with existing weight management programmes within primary care for people with obesity class I or uncomplicated obesity class II or higher.

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This study is active but is not currently recruiting participants.

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Key information

Age range

18 year–60 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

The Department of Medicine and the Gastro Unit, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark

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About this study

In the LightCARE trial, an intensive weight loss (IWL) intervention will compared with usual care. The IWL lasts two years, and includes total dietary replacements, behavioural support, and weight loss medication in three phases:

  • Induction' phase (week 0-12 after randomisation): total dietary replacement (TDR) programme and behavioural support with weight loss medication (WLM) if rate of weight loss is insufficient.
  • Weight loss continuation' phase (week 13-32 after randomisation): progression of dietary programme including reduction in use of TDR products, reintroduction of healthy foods, with behavioural support, introduction of physical activity, WLM (as required).
  • Maintenance' phase (week 33-104 after randomisation): Continued healthy diet and physical activity with WLM (if required), with return to induction phase if weight regain occurs induction, weight loss continuation, maintenance.

Usual care will differ between the two countries (Denmark and the United Kingdom).

In Denmark, participants will receive a pamphlet on current obesity management guidelines from the Danish National Board of Health, and will be advised to contact their GP for potential referral to local municipality-based obesity management programmes. Furthermore, a notification will be sent to the participant's GP, informing that the participant has been enrolled in the trial and is randomised to usual care. The availability and structure of current obesity programmes varies between municipalities.

In the United Kingdom, participants will be offered to discuss weight management programmes available in their area with their GP practice; the programmes available referral routes vary slightly from place to place. Tier 2 weight management services are mostly commissioned by local authority, and therefore differ slightly across the 333 local authorities in England. These local community-based weight management services provide diet, nutrition, behavioural advice.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Please note that participants need to be invited in order to take part in the trial.

Inclusion criteria

  • Age ≥18 years and ≤60 years old at screening.
  • BMI ≥30 kg/m2 or ≥27.5 kg/m2 in people with South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean family backgrounds (as reported by the participants).
  • Informed consent.

Exclusion criteria

  • Has severe and complex obesity, i.e., obesity class II (BMI≥35 if white or 32.5 if non-white) with one or more of these specific adiposity-related comorbidities: cardiovascular disease, type 2 diabetes, hypertension, non-alcoholic steatosis, or sleep apnoea (Appendix 1).
  • Intending to become pregnant in the next two years, or pregnant, or breastfeeding.
  • Use of WLM or GLP-1 agonist treatment within the last 3 months.
  • Currently being treated for cancer other than oestrogen antagonist therapy or non-melanoma skin cancer.
  • Prior bariatric surgery, not including laparoscopic gastric banding, intragastric balloons or duodenal-jejunal bypass sleeve (Endobarrier™ or similar) if the device has been removed >1 year before screening.
  • Diagnosis or treatment for eating disorder within the last 6 months.
  • Any other disease that markedly compromises the participant's ability to adhere to the treatment programme or follow-up or is likely to mean that weight loss will not improve the person's length or quality of life, such as conditions limiting life expectancy.
  • Conditions that contraindicate or complicate total diet replacement (including type 1 diabetes or other diabetes requiring any insulin therapy, phenylketonuria, or other conditions requiring special diets).
  • Taking part in other research involving multidisciplinary obesity treatment that would compromise participation in this trial.
  • Conditions that contraindicate or complicate GLP-1 or GIP agonist treatment (including history of pancreatitis)
  • Another member of the household enrolled in the trial.

Treatment and study plan

Intensive weight loss intervention

Behavioral

Intensive weight loss intervention, incl. total meal replacements, behavioural support, and weight loss medication.

Usual Care

Behavioral

Usual care

Primary outcomes

  1. Weight

    Time frame: 104 weeks after randomisation

    Weight (kg)

Secondary outcomes

  1. Weight loss (20%)

    Time frame: 104 weeks after randomisation

    Proportion of participants with weight loss ≥20%

  2. Short-Form-36, mental component score

    Time frame: 104 weeks after randomisation

    Quality of life, SF36-mental component score (scale from 0-100, higher scores indicate better mental health)

  3. Gait speed

    Time frame: 104 weeks after randomisation

    4-metre gait speed (m/s)

  4. MetS-Z

    Time frame: 104 weeks after randomisation

    Metabolic syndrome severity Z-score (scale from -4 to 4, mean is 0, higher scores indicate a worse outcome)

Other outcomes

  1. Safety - SAE

    Time frame: 104 weeks after randomisation

    Proportion of participants that experienced at least one serious adverse event (according to ICH-GCP guidelines)

  2. Safety - eating disorder

    Time frame: 104 weeks after randomisation

    Proportion of participants with incident eating disorders during the intervention period

  3. Safety - bone mineral density (BMD) assessed by DXA

    Time frame: 104 weeks after randomisation

    • Bone mineral density (g/cm²) of hip (total hip and femoral neck).
    • Bone mineral density (g/cm²) of lumbar region.
  4. Body composition - waist circumference

    Time frame: 104 weeks after randomisation

    Waist circumference (cm)

  5. Body composition - fat percentage

    Time frame: 104 weeks after randomisation

    • Body fat percentage
    • Visceral fat percentage
    • Subcutaneous fat percentage
  6. Body composition - weight loss (10%)

    Time frame: 104 weeks after randomisation

    Proportion of participants with weight loss ≥10%

  7. Physical functioning - SENS

    Time frame: 104 weeks after randomisation

    Objectively measured moderate to vigorous physical activity (MVPA) using SENS Motion accelerometers (hours/day)

  8. Physical functioning - SF-36

    Time frame: 104 weeks after randomisation

    Short Form 36 (SF-36) physical component score (scale from 0-100, higher scores indicate better physical health)

  9. Physical functioning - sit to stand test

    Time frame: 104 weeks after randomisation

    Number of sit to stands completed 30 Second Sit to Stand test

  10. Physical functioning - quality of life

    Time frame: 104 weeks after randomisation

    EQ-5D-5L (the 5-level EQ-5D version), index score (score between -1 and 1, higher scores indicate better health)

  11. Sleep

    Time frame: 104 weeks after randomisation

    Sleep duration using SENS Motion accelerometers (hours/day)

  12. Medications during the intervention period

    Time frame: 104 weeks after randomisation

    • Proportion of participants prescribed glucose-lowering medications during the intervention period (number, type)
    • Proportion of participants prescribed lipid-lowering medications during the intervention period (number, type)
    • Proportion of participants prescribed blood pressure-lowering medications during the intervention period (number, type)
    • Proportion of participants prescribed medication for pain relief during the intervention period (number, type)
    • Proportion of participants prescribed medications for psychiatric disorders (number, type)
  13. Metabolic health - blood pressure

    Time frame: 104 weeks after randomisation

    Systolic and diastolic blood pressure (mmHg)

  14. Metabolic health - pulse

    Time frame: 104 weeks after randomisation

    Pulse rate (beats per minute)

  15. Metabolic health - glucose

    Time frame: 104 weeks after randomisation

    Fasting glucose concentration (mmol/l)

  16. Metabolic health - Hb1Ac

    Time frame: 104 weeks after randomisation

    Haemoglobin A1c (mmol/mol)

  17. Metabolic health - insulin

    Time frame: 104 weeks after randomisation

    Fasting insulin concentration (pmol/L)

  18. Metabolic health - HOMA2-IR

    Time frame: 104 weeks after randomisation

    HOMA2-IR (calculated from glucose and C-peptide concentration) (ratio)

  19. Metabolic health - lipids

    Time frame: 104 weeks after randomisation

    Fasting lipid profile (HDL, LDL and triglycerides) (mmol/L)

  20. Metabolic health - eGFR

    Time frame: 104 weeks after randomisation

    Estimated Glomerular Filtration Rate (eGFR), creatinine (µmol/L), calculated from creatinine, sex and years

  21. Metabolic health - hsCRP

    Time frame: 104 weeks after randomisation

    High-sensitivity C-reactive protein (hsCRP), mg/L

  22. Metabolic health - Fib4

    Time frame: 104 weeks after randomisation

    Fib-4 (ALT/AST/platelets) (ratio)

  23. Metabolic health - Proteinuria

    Time frame: 104 weeks after randomisation

    Proteinuria, measured as urine albumin/creatinine (ratio)

  24. Metabolic health - TSH

    Time frame: 104 weeks after randomisation

    Thyroid-stimulating hormone (IU/L)

  25. Mental health - MDI

    Time frame: 104 weeks after randomisation

    Major Depression Inventory (MDI) (scale from 0-50, higher scores indicate more symptoms of depression)

  26. Mental health - WBIS-M

    Time frame: 104 weeks after randomisation

    Weight Bias Internalization Scale (WBIS-M) score (scale from 1-7, higher scores indicate higher degree of internalised weight bias)

  27. Mental health - EDE-Q

    Time frame: 104 weeks after randomisation

    Eating Disorder Examination Questionnaire (EDE-Q) score (scale from 0 to 6, higher scores indicate higher degree of eating disorder)

  28. Labour market attachment - WPAI

    Time frame: 104 weeks after randomisation

    Work productivity and impairment (WPAI) score points (scale from 0-100, higher scores indicate more limitations in ability to work and lower productivity)

  29. Labour market attachment - days of sick leave

    Time frame: 104 weeks after randomisation

    Self-reported number of days sick leave during follow-up

  30. Genetic profiles' (using comprehensive genetic mapping) association with the metabolic and/or weight loss response to IWL vs usual care

    Time frame: 104 weeks after randomisation

    • Common gene variants with low to moderate effect on the phenotype for the construction of aggregate genetic risk scores
    • Rare variants with potential functional effects in genes known to harbour high-impact obesity variants e.g. MC4R, LEP, LEPR, POMC, PCSK1, SIM1, NTRK2, MC3R, MRAP2, BDNF, SH2B1, KSR2
  31. Health economy: Within-trial cost-effectiveness analysis - quality of life

    Time frame: 104 weeks after randomisation

    Quality of life (measured using the 5-level EQ-5D version (EQ-5D-5L), VAS score (scale from 0-100, higher scores indicate better health)

  32. Health economy: Within-trial cost-effectiveness analysis - costs

    Time frame: 104 weeks after randomisation

    24-month costs, DKK

  33. Health economy: Within-trial cost-effectiveness analysis - QALY

    Time frame: 104 weeks after randomisation

    Incremental cost per quality-adjusted-life-year (QALY) gained, DKK

  34. Health economy: Model-based cost-effectiveness analysis - QALY

    Time frame: 104 weeks after randomisation

    Predicted lifetime QALYs gained

  35. Health economy: Model-based cost-effectiveness analysis - healthcare costs

    Time frame: 104 weeks after randomisation

    Predicted lifetime healthcare costs, DKK

  36. Health economy: Model-based cost-effectiveness analysis - cost effectiveness ratios

    Time frame: 104 weeks after randomisation

    Long-term incremental cost effectiveness ratios

  37. Long-term effects - mortality and major cardiovascular disease (CVD)

    Time frame: 5, 10 and 20 years after randomisation

    • Proportion of participants who die from any cause
    • Proportion of participants with a major CVD outcome consisting of any of the following (each of the components will be assessed exploratively): myocardial infarction, stroke, hospitalisation for angina, coronary-artery bypass grafting, percutaneous coronary intervention, hospitalisation for heart failure, peripheral vascular disease
  38. Long-term effects - prescription patterns

    Time frame: 5, 10 and 20 years after randomisation

    • Proportion of participants on glucose-lowering medications
    • Proportion of participants on lipid-lowering medications
    • Proportion of participants on blood pressure-lowering medications
    • Proportion of participants on medication for pain relief
    • Proportion of participants on weight loss medication
    • Proportion of participants on medication used for psychiatric disorders (antidepressants, anxiolytics, antipsychotics)
  39. Long-term effects - incident cancer

    Time frame: 5, 10 and 20 years after randomisation

    • Proportion of participants with any diagnosis of cancer
    • Proportion of participants with cancers known to be associated with obesity: GI tract including liver and kidney and reproduction organs (including breast for women and prostate for men)
  40. Long-term effects - fracture risk

    Time frame: 5, 10 and 20 years after randomisation

    • Proportion of participants with major osteoporotic fracture (hip, spine, wrist)
    • Proportion of participants with any fracture
  41. Long-term effects - health economic and labour market attachment, employment status

    Time frame: 5, 10 and 20 years after randomisation

    Employment status each participant

  42. Long-term effects - health economic and labour market attachment, salary

    Time frame: 5, 10 and 20 years after randomisation

    Salary for each participant

  43. Long-term effects - health economic and labour market attachment, absence

    Time frame: 5, 10 and 20 years after randomisation

    Number of absence days

  44. Long-term effects - health economic and labour market attachment, sick leave

    Time frame: 5, 10 and 20 years after randomisation

    Proportion of participants with any sick leave

  45. Long-term effects - health economic and labour market attachment, long-term sick leave

    Time frame: 5, 10 and 20 years after randomisation

    Proportion of participants with long-term sick leave (more than 4 weeks continuous sickness absence)

Sponsors and collaborators

Lead sponsor

Carsten Dirksen

Other

Collaborators

  • Copenhagen Trial Unit, Center for Clinical Intervention Research
  • University of Copenhagen
  • University of Oxford
  • University of Southern Denmark

Registry information

Official study title

Intensive Weight Loss Intervention Versus Usual Care for Adults With Obesity: the LightCARE Randomised Trial. Lighthouse Consortium on Obesity Management (LightCOM) Trial no 2

Acronym: LightCARE

Important dates

Study start
2024
Primary completion
2028
Study completion
2048
First posted
Mar 20, 2024
Registry last updated
Feb 10, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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