An observational study in Obesity, Bariatric Surgery and Laparoscopic Sleeve Gastrectomy, sponsored by Özlem ÖZPAK AKKUŞ. Not yet recruiting at 1 site in Turkey (Türkiye). Open to participants aged 18 Years to 50 Years. Per ClinicalTrials.gov, last updated 2026-06-09.
Sponsored by Özlem ÖZPAK AKKUŞ · Observational
This study aims to evaluate changes in eating behavior attitudes, nutritional status, and appetite-regulating hormonal parameters in individuals who have undergone Laparoscopic Sleeve Gastrectomy (LSG). The study will be conducted at Bursa Yıldırım Doruk Hospital, Department of General Surgery. A total of 40 volunteer participants who underwent LSG within the last month will be included. Participants will be assessed at baseline (shortly after surgery) and at 6-month follow-up. Assessments will include anthropometric measurements (body weight, height, waist and hip circumference, BMI, waist-to-hip ratio), 3-day dietary intake records analyzed using BeBIS 8.2 software, and the Adult Eating Behavior Scale. Biochemical parameters including fasting blood glucose, total cholesterol, triglycerides, HDL, LDL, VLDL cholesterol, and insulin will be obtained from patient files and analyzed using Advia Chemistry 2400 and Advia XPT devices. Additionally, appetite-regulating hormones (ghrelin, GLP-1, PYY) will be analyzed from residual blood samples using the ELISA method with RelAssay Diagnostics kits by Teknogen Bioengineering Laboratory. All data will be compared between baseline and 6-month follow-up to evaluate the impact of bariatric surgery on nutritional and hormonal outcomes.
This observational study will be conducted at Bursa Yıldırım Doruk Hospital, General Surgery Clinic, under the supervision of Assoc. Prof. Dogukan Durak. Forty volunteer participants who underwent Laparoscopic Sleeve Gastrectomy (LSG) within the last month and meet the inclusion and exclusion criteria will be enrolled after signing an informed consent form.
Assessments will be performed at two time points: at baseline (shortly after surgery) and at 6-month follow-up.
Anthropometric Measurements: Body weight, height, waist and hip circumference will be measured. BMI and waist-to-hip ratio will be calculated accordingly. Waist circumference will be evaluated according to WHO criteria.
Dietary Assessment: A 3-day dietary intake record will be collected from each participant at both time points. Food portion sizes will be estimated using the "Food and Nutrient Photo Catalog." Energy and macronutrient intake will be analyzed using BeBIS 8.2 software and evaluated according to the Turkish Dietary Guidelines 2022 (TUBER 2022).
Eating Behavior Assessment: The Adult Eating Behavior Scale (developed by Celik et al.) will be administered at both time points. The scale consists of 18 items and 5 subscales, scored between 0-100. Higher scores indicate more positive attitudes toward eating behavior.
Biochemical and Hormonal Parameters: After 12-hour fasting, the following biochemical parameters will be obtained from patient files: fasting blood glucose (FBG), total cholesterol (TC), triglycerides (TG), high-density lipoprotein (HDL) cholesterol, low-density lipoprotein (LDL) cholesterol, very low-density lipoprotein (VLDL) cholesterol, and insulin. Routine biochemical parameters and lipid profile will be analyzed spectrophotometrically using the Advia Chemistry 2400 device, while insulin will be measured by chemiluminescence using the Advia XPT device. Additionally, appetite-regulating hormones including ghrelin, glucagon-like peptide-1 (GLP-1), and peptide YY (PYY) will be analyzed from residual blood samples stored at -20°C by Teknogen Bioengineering Laboratory using the ELISA method with an automated microplate reader (Biotek TS800) and RelAssay Diagnostics commercial kits (Ankara, Turkey).
All data will be compared between baseline and 6-month follow-up using appropriate statistical methods.
11,522 studies on the registry are indexed under Obesity; 2,033 are open to participants now.
This study's planned enrollment of 40 is below the median of 114 across 2,154 observational studies indexed under Obesity.
Browse Obesity studies →This is the only study on the registry with Özlem ÖZPAK AKKUŞ as lead sponsor.
Counted across the registry records on this site, refreshed daily.
Adult patients who underwent Laparoscopic Sleeve Gastrectomy (LSG) within the last month at Bursa Yıldırım Doruk Hospital, General Surgery Clinic, under the supervision of Assoc. Prof. Dogukan Durak, and who meet the inclusion and exclusion criteria.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Individuals who underwent Laparoscopic Sleeve Gastrectomy (LSG) within the last month at Bursa Yıldırım Doruk Hospital, General Surgery Clinic, and meet the inclusion and exclusion criteria. Participants will be assessed at baseline (shortly after surgery) and at 6-month follow-up.
Other: Anthropometric Measurements and Dietary Assessment
Anthropometric measurements (body weight, height, waist and hip circumference, BMI, waist-to-hip ratio), 3-day dietary intake records, Adult Eating Behavior Scale, and biochemical and hormonal parameters (fasting blood glucose, lipid profile, insulin, ghrelin, GLP-1, PYY) will be assessed at baseline and at 6-month follow-up.
Also known as: Biochemical and Hormonal Parameter Analysis, Adult Eating Behavior Scale, 3-Day Dietary Intake Record
Change in Serum Ghrelin Concentration (pg/mL)
Change in serum ghrelin levels between baseline and 6-month follow-up, assessed by ELISA method.
Time frame: Baseline and 6 months after surgery
Change in Serum GLP-1 Concentration (pmol/L)
Change in serum glucagon-like peptide-1 (GLP-1) levels between baseline and 6-month follow-up, assessed by ELISA method.
Time frame: Baseline and 6 months after surgery
Change in Serum PYY Concentration (pg/mL)
Change in serum peptide YY (PYY) levels between baseline and 6-month follow-up, assessed by ELISA method.
Time frame: Baseline and 6 months after surgery
Change in Adult Eating Behavior Scale Total Score (0-100)
Change in Adult Eating Behavior Scale total score between baseline and 6-month follow-up. Scale is scored between 0-100; higher scores indicate more positive eating behavior attitudes.
Time frame: Baseline and 6 months after surgery
Change in Daily Energy Intake (kcal/day)
Change in daily energy intake assessed by 3-day dietary intake records at baseline and 6-month follow-up. Food portions will be estimated using the Food and Nutrient Photo Catalog. Data will be analyzed using BeBIS 8.2 software and evaluated according to Turkish Dietary Guidelines 2022.
Time frame: Baseline and 6 months after surgery
Change in Daily Protein Intake (g/day)
Change in daily protein intake assessed by 3-day dietary intake records at baseline and 6-month follow-up. Food portions will be estimated using the Food and Nutrient Photo Catalog. Data will be analyzed using BeBIS 8.2 software and evaluated according to Turkish Dietary Guidelines 2022
Time frame: Baseline and 6 months after surgery
Change in Daily Carbohydrate Intake (g/day)
Change in daily carbohydrate intake assessed by 3-day dietary intake records at baseline and 6-month follow-up. Food portions will be estimated using the Food and Nutrient Photo Catalog. Data will be analyzed using BeBIS 8.2 software and evaluated according to Turkish Dietary Guidelines 2022.
Time frame: Baseline and 6 months after surgery
Change in Daily Fat Intake (g/day)
Change in daily fat intake assessed by 3-day dietary intake records at baseline and 6-month follow-up. Food portions will be estimated using the Food and Nutrient Photo Catalog. Data will be analyzed using BeBIS 8.2 software and evaluated according to Turkish Dietary Guidelines 2022.
Time frame: Baseline and 6 months after surgery
Change in Body Weight (kg)
Change in body weight between baseline and 6-month follow-up.
Time frame: Baseline and 6 months after surgery
Change in Body Mass Index (kg/m²)
Change in BMI between baseline and 6-month follow-up. Weight and height will be combined to report BMI in kg/m².
Time frame: Baseline and 6 months after surgery
Change in Waist Circumference (cm)
Change in waist circumference between baseline and 6-month follow-up.
Time frame: Baseline and 6 months after surgery
Change in Hip Circumference (cm)
Change in hip circumference between baseline and 6-month follow-up.
Time frame: Baseline and 6 months after surgery
Change in Waist-to-Hip Ratio
Change in waist-to-hip ratio between baseline and 6-month follow-up. Waist and hip circumference measurements will be combined to calculate the waist-to-hip ratio.
Time frame: Baseline and 6 months after surgery
Change in Fasting Blood Glucose Concentration (mg/dL)
Change in fasting blood glucose levels between baseline and 6-month follow-up.
Time frame: Baseline and 6 months after surgery
Change in Total Cholesterol Concentration (mg/dL)
Change in total cholesterol levels between baseline and 6-month follow-up.
Time frame: Baseline and 6 months after surgery
Change in Triglyceride Concentration (mg/dL)
Change in triglyceride levels between baseline and 6-month follow-up.
Time frame: Baseline and 6 months after surgery
Change in HDL Cholesterol Concentration (mg/dL)
Change in high-density lipoprotein (HDL) cholesterol levels between baseline and 6-month follow-up.
Time frame: Baseline and 6 months after surgery
Change in LDL Cholesterol Concentration (mg/dL)
Change in low-density lipoprotein (LDL) cholesterol levels between baseline and 6-month follow-up.
Time frame: Baseline and 6 months after surgery
Change in VLDL Cholesterol Concentration (mg/dL)
Change in very low-density lipoprotein (VLDL) cholesterol levels between baseline and 6-month follow-up.
Time frame: Baseline and 6 months after surgery
Change in Fasting Insulin Concentration (µIU/mL)
Change in fasting insulin levels between baseline and 6-month follow-up.
Time frame: Baseline and 6 months after surgery
Plan to share: No — Individual participant data will not be shared due to patient privacy and confidentiality concerns in accordance with Turkish Personal Data Protection Law (KVKK). Aggregate study results will be made available through peer-reviewed publication.
Start is estimated for Jul 2026; primary completion for Jan 2027, 6 months later.
Of 791 non-industry observational studies under Obesity, half reached primary completion within 40 months of starting (the median), counting those still running; a quarter within 17 and three quarters within 106. This study's planned 6 months is below that.
Counting every sponsor, half of 836 studies reached it within 39 months; a quarter within 17 and three quarters within 96.
How these figures are worked out, and which studies are left out of them.
This study is not yet recruiting, as verified in Jun 2026. You cannot join it, but the record below documents what was studied.
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