Thiamin (Vitamin B1) Levels in Eating Disorder Adolescent Patients

May 24, 2020 updated by: Assaf Harofeh MC, Assaf-Harofeh Medical Center

Evaluating the B1 Status in Eating Disorder Female Adolescent Patients

Vitamin B1 (Thiamine) is a water soluble essential nutrient; it is synthesized by a variety of plants and microorganisms. Since animals usually cannot synthesis it, humans must be supplied with exogenous vitamin B1 in the diet. The human storage of thiamine is small- about 30mg, an intake of 1-2 mg a day is needed to maintain this pool. Deficiency might occur when the vitamin is depleted from the diet in a short period. Vitamin B1 has a role in energy metabolism and main biosynthetic pathways. Low thiamine causes illnesses in the central and peripheral nervous systems as well as affecting the heart and gastrointestinal systems.

Deficiency may occur from malnutrition of different mechanisms such as alcoholism, lack in diet and recently secondary to anti-obesity surgery and few case reports described eating disorders as the reason for developing deficiency causing neuropathy, (1,2) and encephalopathy (3,4,5).

One of the presentations of thiamine deficiency is peripheral neuropathy mimicking Guillain-Barre syndrome, and administering the lacking vitamin improves the symptoms.

One study examined the prevalence of vitamin B1 deficiency in adult anorexia nervosa patients (6) by measurement of the activation of the enzyme erythrocyte transketolase following addition of thiamin pyrophosphate and comparing them to control of blood donors. This study found significant lower levels of vitamin B1 in the anorectic patient compared to the controls.

Rational of the study:

The investigators assume that these few cases described of overt neurologic impairment due to vitamin B1 deficiency because of distorted eating are just the "tip of the iceberg" and more eating disorders patients lack thiamine, that may have neuropsychiatric effect on the illness and identifying and treating the shortage may improve the symptoms of the disorder and maybe even the distorted thoughts that are fundamental in eating disorders.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Detailed Description

Methods:

In Assaf Harofe medical center over 50 adolescents (mainly girls) aged 10-18 years are treated annually for eating disorders by a multidisciplinary team. Their nutritional and medical condition is assessed also by blood analysis routinely. The investigators are planning to check thiamine status in eating disorders female patients in different stages of treatment, comparing them with age and sex matched controls that do not have eating disorders problems. The control group will be recruited from patient treated in the outpatient day hospital and have blood tested anyhow that don't suffer from eating, metabolic, nutritional or gastrointestinal disorders.

The researchers will look for correlation between different types of eating disorders, nutritional state, treatment progress and levels of vitamin B1.

Thiamin will be determined in whole blood using High-Performance Liquid Chromatography (HPLC) that is superior to the previous method as described above, determining thiamin diphosphate; the physiologically active form of vitamin B1 accurately.

Sample size: A previous study on thiamine concentration in 50 healthy French volunteers found a standard deviation (SD) of 15 nmol/l (7). 17 patients in each group were required in order to detect a 15 nmol/l difference in mean thiamine levels with a power of 80% and Alfa of 0.05. In order to overcome a possibly higher SD and to allow for subgroup analysis , we decided to recruit 30 patients for each group.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
69

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

  • Israel
      • Zrifin, Israel, 70300
        • Pediatric devision Assaf harofeh MC

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

12 years to 19 years (Child, Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Female

Sampling Method

Non-Probability Sample

Study Population

adolescent girls with eating disordes aged 12-18

Description

Inclusion Criteria:

  • Adolescent girls aged 12-18

Exclusion Criteria:

  • Girls suffering from metabolic
  • Nutritional or gastrointestinal disorders

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

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
B1 blood levels

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
establishing B1 levels
Time Frame: one year
one year

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Assaf-Harofeh Medical Center

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

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
March 1, 2013

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 1, 2015

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
January 1, 2016

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
June 6, 2013

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 13, 2014

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
June 16, 2014

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
May 27, 2020

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 24, 2020

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2020

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 214/12

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