Low Energy Ketogenic Diet in Obese Subjects - the Impact on Whole Organism

NCT ID: NCT03338452

Last Updated: 2018-10-12

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

38 participants

Study Classification

INTERVENTIONAL

Study Start Date

2017-03-18

Study Completion Date

2018-06-24

Brief Summary

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The study evaluates the timeline of changes of body composition, physical and psychological performance, and biochemical markers of metabolism and inflammation responses to low energy ketogenic diet for loosing weight in obese individuals. The participants will be monitored and guided by the interdisciplinary obesity team for 12 weeks.

Detailed Description

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Ketogenic diets have been shown to be an effective tool to fight obesity with reported good adherence due to their ability to suppress the drive to eat. They are also gaining popularity in public, despite some concerns regarding the quality and timeline of changes of body composition and the effects on health parameters of whole organism.

For effective weight loss, energy deficit is required. Very low energy (600 - 800 kcal) ketogenic diets have been extensively studied.

The proposed study combines low energy (800 - 1500 kcal) and ketogenic diet intervention. The aim of the study is a comprehensive determination of quality of body mass loss, metabolic states changes, physical and psychological performance changes, and inflammatory and hormones profile changes during and post a 12-week low energy ketogenic diet intervention.

Conditions

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Obesity

Study Design

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Allocation Method

NA

Intervention Model

SINGLE_GROUP

Longitudinal intervention study with repeated measurements. Participants will be subjected to a 12-week low energy ketogenic diet (LEKD) and requested not to change their physical activity levels throughout the study.

The participants will underwent a series of tests and consultations at baseline (prior to the start of the intervention), and after 1, 2, 4, 8 , and 12 weeks of LEKD intervention. At the end of each time points, body weight and composition will be measured in the fasting state, food and exercise diaries checked by a dietitian and a kinesiologist and discussed with the participants, psychological and cognitive tests will be performed by a psychologist. At the same time-points, different serum analyses will be performed.
Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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participants

The participants will be subjected to low energy ketogenic diet.

Group Type EXPERIMENTAL

Low energy ketogenic diet

Intervention Type BEHAVIORAL

Low energy ketogenic diet lasting 12 weeks with a previous preparation period including detailed instructions during classes and individual counselling by a dietitian. Participants were provided with a list of suitable foods with very low carbohydrate content. Furthermore, the subjects shared cooking recipes and links to helpful webpages. They were free to follow a KD according to their personal preferences but limit their carbohydrate intake to 5-10 % of total energy from carbohydrates, but derive at least 70 % of total energy from fat.

Interventions

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Low energy ketogenic diet

Low energy ketogenic diet lasting 12 weeks with a previous preparation period including detailed instructions during classes and individual counselling by a dietitian. Participants were provided with a list of suitable foods with very low carbohydrate content. Furthermore, the subjects shared cooking recipes and links to helpful webpages. They were free to follow a KD according to their personal preferences but limit their carbohydrate intake to 5-10 % of total energy from carbohydrates, but derive at least 70 % of total energy from fat.

Intervention Type BEHAVIORAL

Eligibility Criteria

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Inclusion Criteria

* BMI \> 30 kg/m2
* asymptomatic for any disease except obesity

Exclusion Criteria

* presence of cardiovascular, endocrine, acute or chronic inflammatory diseases;
* taking medications for lipid metabolism, or psychiatric disorders;
* adherence to a prescribed diet;
* unstable weight in the past 3 months;
* BMI \< 30 kg/m2;
* unwilling or unable to eat the foods prescribed in the study;
* vigorous physical activity;
* pregnancy or lactation.
Minimum Eligible Age

25 Years

Maximum Eligible Age

55 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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University of Primorska

OTHER

Sponsor Role lead

Responsible Party

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Zala Jenko Praznikar

Assist. prof. dr. sc.

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Zala Jenko Pražnikar, PhD

Role: PRINCIPAL_INVESTIGATOR

University of Primorska, Faculty of Health Sciences

Locations

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University of Primorska, Faculty of Health Sciences

Izola, , Slovenia

Site Status

Countries

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Slovenia

References

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Noakes TD, Windt J. Evidence that supports the prescription of low-carbohydrate high-fat diets: a narrative review. Br J Sports Med. 2017 Jan;51(2):133-139. doi: 10.1136/bjsports-2016-096491.

Reference Type BACKGROUND
PMID: 28053201 (View on PubMed)

Yang MU, Van Itallie TB. Composition of weight lost during short-term weight reduction. Metabolic responses of obese subjects to starvation and low-calorie ketogenic and nonketogenic diets. J Clin Invest. 1976 Sep;58(3):722-30. doi: 10.1172/JCI108519.

Reference Type BACKGROUND
PMID: 956398 (View on PubMed)

Urbain P, Strom L, Morawski L, Wehrle A, Deibert P, Bertz H. Impact of a 6-week non-energy-restricted ketogenic diet on physical fitness, body composition and biochemical parameters in healthy adults. Nutr Metab (Lond). 2017 Feb 20;14:17. doi: 10.1186/s12986-017-0175-5. eCollection 2017.

Reference Type BACKGROUND
PMID: 28239404 (View on PubMed)

Paoli A, Bianco A, Damiani E, Bosco G. Ketogenic diet in neuromuscular and neurodegenerative diseases. Biomed Res Int. 2014;2014:474296. doi: 10.1155/2014/474296. Epub 2014 Jul 3.

Reference Type BACKGROUND
PMID: 25101284 (View on PubMed)

Other Identifiers

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LEKD2017

Identifier Type: -

Identifier Source: org_study_id

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