Metabolic Effects of Diet-Exercise Interventions in Obesity

July 8, 2026 updated by: Elif Subaşı, Firat University

Metabolic Responses of Diet-Exercise Combinations in Women With Obesity: A Comparative Lifestyle Intervention Study With Different Diet Types

This study investigates the effects of different dietary strategies (ketogenic diet, intermittent fasting, and semi-vegetarian diet), alone or in combination with a structured home-based exercise program, on anthropometric, metabolic, and hormonal parameters in women with obesity. A total of 108 participants aged 19-45 years are allocated into nine groups, including control, exercise-only, diet-only, and combined intervention groups. Anthropometric outcomes (body weight, body mass index, and body fat percentage) and biochemical markers (glucose, insulin, adiponectin, IGF-1, irisin, and myostatin) are assessed at baseline and after a 6-week intervention period using bioelectrical impedance analysis and ELISA methods.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

108

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Medically and physically fit for exercise interventions.
  • No participation in any structured dietary programs within the previous 3 months.
  • Lack of orthopedic limitations that would prevent safe physical activity.

Exclusion Criteria:

  • Pregnancy or lactation.
  • Chronic conditions such as cancer, renal failure, or hepatic failure.
  • Diagnosed psychiatric disorders.
  • History of adverse reactions to venipuncture.
  • Inability or unwillingness to adhere to the assigned dietary and exercise intervention protocols.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Factorial Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
No Intervention: Control (C)
This group consists of 12 individuals with normal weight who do not receive any dietary or exercise interventions. They maintain their habitual lifestyle, physical activity, and dietary patterns for 6 weeks.
No Intervention: Obese (O)
This group consists of 12 individuals with obesity who do not receive any dietary or exercise interventions. They maintain their regular lifestyle, physical activity, and dietary habits for 6 weeks.
Experimental: Obese with exercise (OE)
This group consists of 12 individuals with obesity who participate in a structured home-based exercise program for 6 weeks, without any dietary modifications.
Behavioral: Home-Based Exercise Program
A 6-week structured home-based exercise program consisting of moderate-intensity activities designed for weight management and metabolic improvement.
Other Names:
  • Structured Physical Exercise
Experimental: Obese with exercise plus semi-vegetarian diet (OEVD)
This group consists of 12 individuals with obesity who follow a structured semi-vegetarian dietary protocol combined with a home-based exercise program for 6 weeks.
Behavioral: Home-Based Exercise Program
A 6-week structured home-based exercise program consisting of moderate-intensity activities designed for weight management and metabolic improvement.
Other Names:
  • Structured Physical Exercise
Other: Semi-Vegetarian Diet
A 6-week structured semi-vegetarian dietary protocol primarily based on plant foods with occasional inclusion of meat or fish, designed for caloric control and metabolic tracking.
Other Names:
  • Flexitarian Dietary Intervention
Experimental: Obese with semi-vegetarian diet (OVD)
This group consists of 12 individuals with obesity who follow a structured semi-vegetarian dietary protocol for 6 weeks, without participating in any exercise program.
Other: Semi-Vegetarian Diet
A 6-week structured semi-vegetarian dietary protocol primarily based on plant foods with occasional inclusion of meat or fish, designed for caloric control and metabolic tracking.
Other Names:
  • Flexitarian Dietary Intervention
Experimental: Obese with exercise plus intermittent fasting (OEIF)
This group consists of 12 individuals with obesity who follow a structured intermittent fasting protocol combined with a home-based exercise program for 6 weeks.
Behavioral: Home-Based Exercise Program
A 6-week structured home-based exercise program consisting of moderate-intensity activities designed for weight management and metabolic improvement.
Other Names:
  • Structured Physical Exercise
Other: Intermittent Fasting
A 6-week structured intermittent fasting protocol regulating specific eating and fasting windows each day to evaluate its effects on body composition and metabolic markers.
Other Names:
  • Time-Restricted Feeding (TRF)
Experimental: Obese with intermittent fasting (OIF)
This group consists of 12 individuals with obesity who follow a structured intermittent fasting protocol for 6 weeks, without participating in any exercise program.
Other: Intermittent Fasting
A 6-week structured intermittent fasting protocol regulating specific eating and fasting windows each day to evaluate its effects on body composition and metabolic markers.
Other Names:
  • Time-Restricted Feeding (TRF)
Experimental: Obese with exercise plus ketogenic diet (OEKD)
This group consists of 12 individuals with obesity who follow a structured ketogenic dietary protocol combined with a home-based exercise program for 6 weeks.
Behavioral: Home-Based Exercise Program
A 6-week structured home-based exercise program consisting of moderate-intensity activities designed for weight management and metabolic improvement.
Other Names:
  • Structured Physical Exercise
Other: Ketogenic Diet
A 6-week structured ketogenic dietary protocol characterized by high-fat, adequate-protein, and very low-carbohydrate intake to induce nutritional ketosis.
Other Names:
  • Very Low-Carbonhydrate Ketogenic Diet (VLCKD)
Experimental: Obese with ketogenic diet (OKD)
This group consists of 12 individuals with obesity who follow a structured ketogenic dietary protocol for 6 weeks, without participating in any exercise program.
Other: Ketogenic Diet
A 6-week structured ketogenic dietary protocol characterized by high-fat, adequate-protein, and very low-carbohydrate intake to induce nutritional ketosis.
Other Names:
  • Very Low-Carbonhydrate Ketogenic Diet (VLCKD)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in Body Weight
Time Frame: Baseline and 6 weeks
Body weight will be measured in kilograms (kg) using a calibrated Bioelectrical Impedance Analysis (BIA) device (Omron Karadascan HBF-511, Japan). The outcome will evaluate the effectiveness of the 6-week lifestyle interventions on body mass reduction compared to baseline.
Baseline and 6 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in Body Mass Index (BMI)
Time Frame: Baseline and week 6
Body Mass Index will be calculated using the formula weight in kilograms divided by height in meters squared (kg/m²). Height will be measured using a stadiometer (Holtain Ltd., UK) and weight via a Bioelectrical Impedance Analysis (BIA) device (Omron Karadascan HBF-511, Japan).
Baseline and week 6
Change in Body Fat Percentage
Time Frame: Baseline and week 6
Body fat percentage (%) will be measured using a Bioelectrical Impedance Analysis (BIA) device (Omron Karadascan HBF-511, Japan) to evaluate the proportion of fat tissue relative to total body weight.
Baseline and week 6
Change in Skeletal Muscle Percentage
Time Frame: Baseline and week 6
Skeletal muscle percentage (%) will be measured using a Bioelectrical Impedance Analysis (BIA) device (Omron Karadascan HBF-511, Japan) to evaluate the proportion of muscle tissue relative to total body weight.
Baseline and week 6
Change in Fasting Blood Glucose
Time Frame: Baseline and week 6
Fasting blood glucose levels will be analyzed via Enzyme-Linked Immunosorbent Assay (ELISA) method from venous blood samples to evaluate the effects of the interventions on glycemic control.
Baseline and week 6
Change in Fasting Insulin
Time Frame: Baseline and week 6
Fasting insulin levels will be analyzed via Enzyme-Linked Immunosorbent Assay (ELISA) method from venous blood samples to assess pancreatic beta-cell function and insulin dynamics.
Baseline and week 6
Change in Adiponectin Levels
Time Frame: Baseline and week 6
Serum adiponectin levels will be analyzed via Enzyme-Linked Immunosorbent Assay (ELISA) from venous blood samples to evaluate changes in adipokine secretion and insulin sensitivity.
Baseline and week 6
Change in Insulin-Like Growth Factor 1 (IGF-1) Levels
Time Frame: Baseline and week 6
Serum IGF-1 levels will be analyzed via Enzyme-Linked Immunosorbent Assay (ELISA) from venous blood samples to evaluate alterations in growth hormone axis and metabolic adaptation.
Baseline and week 6
Change in Irisin Levels
Time Frame: Baseline and week 6
Serum irisin levels will be analyzed via Enzyme-Linked Immunosorbent Assay (ELISA) from venous blood samples to track changes in myokine secretion in response to physical activity and dietary interventions.
Baseline and week 6
Change in Myostatin Levels
Time Frame: Baseline and week 6
Serum myostatin levels will be analyzed via Enzyme-Linked Immunosorbent Assay (ELISA) from venous blood samples to assess skeletal muscle mass regulation and myokine alterations.
Baseline and week 6

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Firat University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

July 30, 2023

Primary Completion (Actual)

December 15, 2023

Study Completion (Actual)

January 12, 2024

Study Registration Dates

First Submitted

July 1, 2026

First Submitted That Met QC Criteria

July 8, 2026

First Posted (Actual)

July 10, 2026

Study Record Updates

Last Update Posted (Actual)

July 10, 2026

Last Update Submitted That Met QC Criteria

July 8, 2026

Last Verified

July 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • FSU-OBES-DIETEX-2026-01

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

İndividual participant data will not be shared because participant consent for public data sharing was not obtained.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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