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Collagen Supplements and Post-MBS Muscle Mass/Body Image

3 de septiembre de 2026 actualizado por: Seher Şen, Mudanya University

Relationship Between Collagen-Containing Supplement Use and Muscle Mass and Body Image Following Metabolic and Bariatric Surgery: A Prospective Observational Study

This prospective, observational cohort study aims to evaluate whether the use of collagen-containing supplements is associated with differences in muscle mass, body composition, and body image among patients who have undergone sleeve gastrectomy (SG). The study will be conducted at the General Surgery outpatient clinic of a private hospital in Bursa, Türkiye, between May 2026 and March 2027, and will enroll adult patients (aged 18-65 years) who meet current ASMBS/IFSO eligibility criteria for metabolic and bariatric surgery.

Participants will be naturally allocated into two observational groups based on their own choice to use or not use collagen-containing supplements; no supplement will be provided or recommended by the study team, and no intervention will be made to participants' standard clinical care. All patients will be followed according to routine clinical practice preoperatively and at 2 weeks, 1 month, 3 months, and 6 months postoperatively.

Primary outcome measures include anthropometric parameters (body weight, BMI, fat mass, fat mass percentage, fat-free mass, muscle mass, percentage of weight loss, percentage of excess weight loss, waist and hip circumference) assessed via bioelectrical impedance analysis (Tanita MC-780 MA), and body image assessed using the Turkish-validated Body Shape Questionnaire (BSQ). Secondary outcomes include biochemical parameters, comorbidities, and macronutrient intake data obtained from 3-day dietary records analyzed using the BEBİS nutrition software.

The study hypothesizes that patients using collagen-containing supplements will show significant differences in muscle mass and body composition parameters compared with non-users, and that supplement use will be significantly associated with BSQ scores. A sample size of approximately 52 participants per group was calculated using G*Power 3.1 (one-way ANOVA, Cohen's f = 0.25, α = 0.05, power = 0.80).

Descripción general del estudio

Estado

Reclutamiento

Condiciones

Intervención / Tratamiento

Tipo de estudio

De observación

Inscripción (Estimado)

52

Contactos y Ubicaciones

Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.

Estudio Contacto

  • Nombre: Seher Şen, Assistant Professor
  • Número de teléfono: +905393919700
  • Correo electrónico: seherdalli@gmail.com

Copia de seguridad de contactos de estudio

  • Nombre: Emre Şen, Master's degree graduate
  • Número de teléfono: 0 532 163 30 87

Ubicaciones de estudio

Criterios de participación

Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.

Criterio de elegibilidad

Edades elegibles para estudiar

  • Adulto
  • Adulto Mayor

Acepta Voluntarios Saludables

Sí

Método de muestreo

Muestra no probabilística

Población de estudio

Adult patients aged 18-65 years who underwent sleeve gastrectomy and are under routine postoperative follow-up at the General Surgery outpatient clinic of a private hospital in Bursa, Türkiye. Eligible patients meet current ASMBS/IFSO criteria for metabolic and bariatric surgery (BMI ≥ 35 kg/m², or BMI 30-34.9 kg/m² with an obesity-related metabolic comorbidity). Participants are naturally grouped according to their own preference to use or not use a collagen-containing supplement following surgery.

Descripción

Inclusion Criteria:

  • Patients with a BMI ≥ 35 kg/m², regardless of the presence of comorbidities
  • Patients with a BMI of 30-34.9 kg/m² who have an obesity-related metabolic disease and are considered eligible for surgical treatment
  • Patients who have undergone metabolic and bariatric surgery (MBS) in accordance with current ASMBS/IFSO guidelines (Eisenberg et al., 2022)
  • Patients under regular postoperative follow-up
  • Age 18-65 years

Exclusion Criteria:

  • Inflammatory bowel disease
  • History of upper gastrointestinal bleeding
  • Severe psychiatric disorders
  • Active cancer diagnosis
  • Pregnancy or breastfeeding
  • Alcohol or substance dependence
  • Physical limitations preventing participation in exercise

Plan de estudios

Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.

¿Cómo está diseñado el estudio?

Detalles de diseño

Cohortes e Intervenciones

Grupo / Cohorte
Intervención / Tratamiento
1. Grup
Group/Cohort Label: Collagen Supplement Users (Kolajen Kullananlar) Description: Participants who, based on their own preference, use a collagen-containing supplement product following sleeve gastrectomy, without any intervention or recommendation from the study team.
Collagen-containing supplement products used at the participants' own discretion following sleeve gastrectomy. The type of product, daily dosage, and duration of use were self-reported by participants
2. Grup
Group/Cohort Label: Non-Users of Collagen Supplement (Kolajen Kullanmayanlar) Description: Participants who do not use any collagen-containing supplement product following sleeve gastrectomy, followed under routine clinical care.

¿Qué mide el estudio?

Medidas de resultado primarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Change in Body Weight
Periodo de tiempo: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
Body weight (kg) measured using a Tanita MC-780 MA device.
Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
Change in Body Shape Questionnaire (BSQ) Score
Periodo de tiempo: Preoperative and postoperative 6 months
Body image concerns were assessed using the Body Shape Questionnaire (BSQ-34), a validated instrument for the Turkish population. This 34-item self-report scale evaluates weight-related concerns and dissatisfaction with body shape over the preceding four weeks. Each item is scored from 1 (never) to 6 (always), with a total score range of 34 to 204. Higher scores indicate greater dissatisfaction with body shape, i.e., a worse outcome.
Preoperative and postoperative 6 months
Change in Body Mass Index (BMI)
Periodo de tiempo: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
BMI calculated as body weight (kg) divided by height squared (m²).
Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
Percentage of Total Weight Loss (%TWL)
Periodo de tiempo: Postoperative and 6 months
Calculated as (preoperative weight - postoperative weight) / preoperative weight × 100.
Postoperative and 6 months
Percentage of Excess Weight Loss (%EWL)
Periodo de tiempo: Postoperative and 6 months
Calculated as (preoperative weight - postoperative weight) / (preoperative weight - ideal weight) × 100. Ideal body weight was calculated assuming a BMI of 25 kg/m².
Postoperative and 6 months
Change in Fat Mass
Periodo de tiempo: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
Fat mass (kg) assessed by multi-frequency bioelectrical impedance analysis (BIA) using a Tanita MC-780 MA device.
Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
Change in Fat Mass Percentage
Periodo de tiempo: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
Fat mass expressed as a percentage of total body weight, assessed by bioelectrical impedance analysis (BIA) using a Tanita MC-780 MA device.
Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
Change in Muscle Mass
Periodo de tiempo: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
Muscle mass (kg) assessed by bioelectrical impedance analysis (BIA) using a Tanita MC-780 MA device.
Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
Change in Muscle Mass Percentage
Periodo de tiempo: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
Muscle mass expressed as a percentage of total body weight, assessed by bioelectrical impedance analysis (BIA) using a Tanita MC-780 MA device.
Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months

Medidas de resultado secundarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Change in Fasting Blood Glucose
Periodo de tiempo: Preoperative and 6 months
Fasting blood glucose (mg/dL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Fasting Insulin
Periodo de tiempo: Preoperative and 6 months
Fasting insulin (µIU/mL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in HbA1c
Periodo de tiempo: Preoperative and 6 months
Glycated hemoglobin (HbA1c, %) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in LDL Cholesterol
Periodo de tiempo: Preoperative and 6 months
LDL cholesterol (mg/dL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in HDL Cholesterol
Periodo de tiempo: Preoperative and 6 months
HDL cholesterol (mg/dL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Triglycerides
Periodo de tiempo: Preoperative and postoperative 6 months
Triglycerides (mg/dL) obtained from routine clinical laboratory follow-up.
Preoperative and postoperative 6 months
Change in Total Cholesterol
Periodo de tiempo: Preoperative and postoperative 6 months
Total cholesterol (mg/dL) obtained from routine clinical laboratory follow-up.
Preoperative and postoperative 6 months
Change in ALT
Periodo de tiempo: Preoperative and 6 months
Alanine aminotransferase (ALT, U/L) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in AST
Periodo de tiempo: Preoperative and 6 months
Aspartate aminotransferase (AST, U/L) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Uric Acid
Periodo de tiempo: Preoperative and 6 months
Uric acid (mg/dL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Urea
Periodo de tiempo: Preoperative and 6 months
Urea (mg/dL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Hemoglobin
Periodo de tiempo: Preoperative and 6 months
Hemoglobin (g/dL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Hematocrit
Periodo de tiempo: Preoperative and 6 months
Hematocrit (%) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Ferritin
Periodo de tiempo: Preoperative and 6 months
Ferritin (ng/mL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Serum Iron
Periodo de tiempo: Preoperative and 6 months
Serum iron (µg/dL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Vitamin B12
Periodo de tiempo: Preoperative and 6 months
Vitamin B12 (pg/mL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Folic Acid
Periodo de tiempo: Preoperative and 6 months
Folic acid (ng/mL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Magnesium
Periodo de tiempo: Preoperative and 6 months
Magnesium (mg/dL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Total Calcium
Periodo de tiempo: Preoperative and 6 months
Total calcium (mg/dL) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Serum Sodium
Periodo de tiempo: Preoperative and 6 months
Serum sodium (mEq/L) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months
Change in Serum Potassium
Periodo de tiempo: Preoperative and 6 months
Serum potassium (mEq/L) obtained from routine clinical laboratory follow-up.
Preoperative and 6 months

Colaboradores e Investigadores

Aquí es donde encontrará personas y organizaciones involucradas en este estudio.

Patrocinador

Fechas de registro del estudio

Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados ​​por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.

Fechas importantes del estudio

Inicio del estudio (Actual)

1 de julio de 2026

Finalización primaria (Estimado)

10 de enero de 2027

Finalización del estudio (Estimado)

10 de febrero de 2027

Fechas de registro del estudio

Enviado por primera vez

29 de julio de 2026

Primero enviado que cumplió con los criterios de control de calidad

3 de septiembre de 2026

Publicado por primera vez (Actual)

9 de septiembre de 2026

Actualizaciones de registros de estudio

Última actualización publicada (Actual)

9 de septiembre de 2026

Última actualización enviada que cumplió con los criterios de control de calidad

3 de septiembre de 2026

Última verificación

1 de septiembre de 2026

Más información

Términos relacionados con este estudio

Otros números de identificación del estudio

  • MUDU-SBE-SS-05

Plan de datos de participantes individuales (IPD)

¿Planea compartir datos de participantes individuales (IPD)?

NO

Descripción del plan IPD

Individual participant data will not be shared, as this was not planned or consented to as part of the study protocol. Data confidentiality was assured to participants at the time of enrollment, and no data sharing infrastructure or agreement is in place beyond the study team.

Información sobre medicamentos y dispositivos, documentos del estudio

Estudia un producto farmacéutico regulado por la FDA de EE. UU.

No

Estudia un producto de dispositivo regulado por la FDA de EE. UU.

No

Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .