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NCT Number: NCT02612259

A Phase II, Randomized, Double-blind, Placebo-controlled, in Parallel Groups Clinical Trial to Assess the Safety and Efficacy of Dietary Supplementation With Tryptophan to Achieve Weight Loss, and Its Neuropsychological Effects in Adolescents With Obesity

A phase II, randomized, double-blind, placebo-controlled, in parallel groups clinical trial to assess the safety and efficacy of dietary supplementation with tryptophan to achieve weight loss, and its neuropsychological effects in adolescents with obesity.

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Key information

Conditions

Obesity Body Weight Nutrition Disorders Nutritional and Metabolic Diseases Overnutrition Overweight Pathological Conditions, Signs and Symptoms Signs and Symptoms

Age range

12 year–17 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Both male and female patients, attending the Pediatric Endocrinology Service on an out-patient basis.
  • Age from 12 to 17 years, inclusively.
  • Presence of a BMI > or = to 2SD and < or = to 4SD (standard deviations) for their age and sex (Spanish cross-sectional growth reference tables of 2008)
  • Patients must have an educational level that permits adequate communication and must agree to cooperate in all the tests and examinations included in the protocol.
  • Subjects of reproductive potential must use an effective birth control method during the study. Women of reproductive age will be recruited after a negative pregnancy test.
  • The informed consent of the parents or legal representative and of the young adults is required.

Exclusion criteria

  • Obesity secondary to an endocrine disease (hypothyroidism, Cushing?s syndrome, polycystic ovary, hypothalamic syndromes, hypogonadism) or the use of medications such as cortisol.
  • Concomitant administration of other psychotrophic medication such as antidepressants or anxiolytics.
  • Patients included in the study must not be taking any vitamins or nutritional supplements or any anti-obesity preparations, including herbal remedies, pharmacy products or homeopathic products.
  • Patients with a known psychiatric disorder.
  • Patients treated with any kind of structured psychotherapy regime.
  • Patients with type 2 DM, arterial hypertension (blood pressure above the 95 percentile for gender and height) or steatotic liver (hypertransaminasemia with echographic image of fatty liver).
  • Patients with any severe food intolerance, or with a known allergy to any of the substances used in the study.
  • Patients in treatment with oral hypoglycemiants.
  • Pregnant or breast-feeding.

Treatment and study plan

TRYPTOPHAN

Dietary Supplement

at the dose of 3,5 m/kg/ day divided in two capsules

Placebo

Other

at the dose of 3,5 m/kg/ day divided in two capsules

Other names: lactose capsules

Primary outcomes

  1. Change in weight by comparing the two groups

    Time frame: From baseline up to 6 months

    to achieve weight loss using Linear Models for Multivariate Outcomes considering as a variables the number of visits, the gender and the group of each patient

  2. Change in systolic and diastolic blood pressure

    Time frame: From baseline up to 6 months

    to achieve improvement of clinical parameters after 6 months of dietary supplementation with tryptophan and determine the difference between the two groups

  3. Change in Body mass index (BMI) defined as wt/ht2 by comparing the two groups

    Time frame: From baseline up to 6 months

    to achieve weight loss using Linear Models for Multivariate Outcomes considering as a variables the number of visits, the gender and the group of each patient

  4. Change in waist/hip ratio by comparing the two groups

    Time frame: From baseline up to 6 months

    to achieve weight loss using Linear Models for Multivariate Outcomes considering as a variables the number of visits, the gender and the group of each patient

  5. Change in Body Mass Index Z score (zBMI) by comparing the two groups

    Time frame: From baseline up to 6 months

    to achieve weight loss using Linear Models for Multivariate Outcomes considering as a variables the number of visits, the gender and the group of each patient

Secondary outcomes

  1. change in total caloric (Kcal) consumption

    Time frame: From baseline up to 6 months

    to achieve improvement of metabolic parameters, patient calories intake were measured during visit 1 and visit 7 and then calories levels were compared with the control group.

  2. Change in calorie consumption measuring weight loss (kcal/Kg/days)

    Time frame: From baseline up to 6 months

    to achieve improvement of metabolic parameters, patient calories intake were measured during visit 1 and visit 7 and then calories levels were compared with the control group.

  3. Change in protein consumption

    Time frame: From baseline up to 6 months

    to achieve improvement of metabolic parameters, patient protein intake were measured during visit 1 and visit 7 and then proteins levels were compared with the control group.

  4. Total Percent of Calories From Protein

    Time frame: From baseline up to 6 months

    to achieve improvement of metabolic parameters, patient protein intake were measured during visit 1 and visit 7 and then proteins levels were compared with the control group.

  5. Total fat consumption

    Time frame: From baseline up to 6 months

    to achieve improvement of metabolic parameters, patient fat intake were measured (grams) during visit 1 and visit 7 and then fat levels were compared with the control group.

  6. Total Percent of Calories From Fat

    Time frame: From baseline up to 6 months

    to achieve improvement of metabolic parameters, patient calories intake were measured during visit 1 and visit 7 and then calories levels were compared with the control group.

  7. Total carbohydrates consumption

    Time frame: From baseline up to 6 months

    to achieve improvement of metabolic parameters, patient carbohydrates intake were measured (grams of carbohydrates) during visit 1 and visit 7 and then carbohydrates levels were compared with the control group.

  8. the mean of lipids concentration (mg/dl)

    Time frame: From baseline up to 6 months

    to achieve improvement of metabolic parameters, the average amount of TSH were measured during visit 1 and visit 7 and then fat levels were compared with the control group. to achieve improvement of metabolic parameters, the average amount of lipids were measured during visit 1 and visit 7 and then fat levels were compared with the control group. The mean of cholesterol both LDL and HDL were considerate for the evaluation.

  9. the amount of Thyroid-stimulating hormone (TSH) concentration (mU/L)

    Time frame: From baseline up to 6 months

    to evaluate the thyroid profile, the average amount of lipids were measured during visit 1 and visit 7 and then TSH levels were compared with the control group.

  10. the amount of thyroxine T4L concentration (pmol/L)

    Time frame: From baseline up to 6 months

    to evaluate the thyroid profile, the average amount of T4L were measured during visit 1 and visit 7 and then T4L levels were compared with the control group.

  11. the amount of creatinine levels (mg/dl)

    Time frame: From baseline up to 6 months

    to evaluate the hepatic profile, the average amount of creatinine were measured during visit 1 and visit 7 and then creatinine levels were compared with the control group.

  12. the amount of Alanine Aminotransferase (ALT) levels (mg/dl)

    Time frame: From baseline up to 6 months

    to assess the hepatic functionality, the average amount of ALT were measured during visit 1 and visit 7 and then ALT mean levels were compared with the control group.

  13. the amount of hemoglobin (g/dl) levels

    Time frame: From baseline up to 6 months

    to assess the renal functionality, the average amount of hemoglobin were measured during visit 1 and visit 7 and then hemoglobin mean levels were compared with the control group.

  14. Change in EuroQoL-5 score over 6 months supplement with tryptophan

    Time frame: From baseline up to 6 months

    to achieve improvement in depression and anxiety after tryptophan administration. Evaluation have been made during Visit 1 and vist 7

  15. Change in the Clinical Global Impressions (CGI) Scale score over 6 months supplement with tryptophan

    Time frame: From baseline up to 6 months

    to achieve improvement in depression and anxiety by comparing the tryptophan group with the placebo group

  16. Change in Children's Manifest Anxiety scale (CMAS) score over 6 months supplement with tryptophan

    Time frame: From baseline up to 6 months

    to achieve improvement in depression and anxiety by comparing the tryptophan group with the placebo group

  17. Change in the Eating Attitudes Test (EAT-40) score

    Time frame: From baseline up to 6 months

    the EAT-40 test is a widely used self-report questionnaire 40-item standardized self-report measure for the assessment of symptoms and concerns characteristic of eating disorders

  18. Change in State-Trait Depression Scales score

    Time frame: From baseline up to 6 months

    The State-Trait Personality Inventory (STPI) is a self-administered questionnaire, consists of eight 10-item subscales: state and trait anxiety, state and trait anger, state and trait curiosity, and state and trait depression. Results from the tryptophan group were compared with the placebo group

  19. Change in Tryptophan plasma level in obese adolescent after 6 months tryptophan administration

    Time frame: From baseline up to 6 months

    For the safety and tolerance assessment of tryptophan supplementation in obese adolescents

  20. Change in Tryptophan/Large neutral aminoacid (LNNA) ratio in obese adolescent plasma after 6 months of tryptophan administration

    Time frame: From baseline up to 6 months

    For the safety and tolerance assessment of tryptophan supplementation in obese adolescents

Sponsors and collaborators

Lead sponsor

Fundació Sant Joan de Déu

Other

Collaborators

  • Instituto de Salud Carlos III

Registry information

Official study title

A Phase II, Randomized, Double-blind, Placebo-controlled, in Parallel Groups Clinical Trial to Assess the Safety and Efficacy of Dietary Supplementation With Tryptophan to Achieve Weight Loss, and Its Neuropsychological Effects in Adolescent Patients Age 12 to 17 Years With Obesity

Important dates

Study start
2012
Primary completion
2014
Study completion
2014
First posted
Nov 23, 2015
Registry last updated
Nov 23, 2015

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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