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Think AHEAD (A Healthy Eating And Drinking) Study

27 juillet 2015 mis à jour par: David S. Ludwig, MD, PhD, Boston Children's Hospital

A 6-Month Study on Diet and Weight Loss in Overweight Adolescents

Advice to increase water consumption as part of a weight-reducing diet - typically to 8 cups (64 fl oz, ~2 L) per day ("8x8" water recommendation) - is almost ubiquitously recommended by healthcare professionals. Many believe that water promotes weight loss through numerous physiological mechanisms. However, only limited observational data and virtually no experimental data exist regarding the effects of water consumption on body weight. In this study, we propose a randomized controlled pilot study in which two groups of overweight adolescents will receive a standard weight loss regimen, either with (experimental intervention) or without (control intervention) additional advice and support to increase water consumption. We will utilize individual sessions, an innovative text messaging protocol, and motivational telephone calls to promote adherence to the interventions. The purpose of this pilot study is to evaluate feasibility and obtain preliminary efficacy data, to inform design of a future, definitive study.

It is hypothesized that increasing water consumption will improve the efficacy of a standard weight-reducing diet and will lead to decreased consumption of energy-containing beverages, decreased total energy intake, improved diet quality, improved immune status, and improved cardiovascular and diabetes risk factors. This simple behavioral intervention will be feasible and will significantly increase water consumption among participants in the experimental vs. control group.

Aperçu de l'étude

Statut

Résilié

Les conditions

Intervention / Traitement

Description détaillée

This is a 6-month randomized controlled trial. After the initial baseline screening and assessments, 60 overweight adolescents will be randomly assigned (30 subjects per group) to a standard weight-reducing diet with the advice to consume 8 cups of water per day (experimental group) or the same standard weight-reducing diet without additional advice (control group). The interventions will consist of nutrition education and behavioral counseling by a registered dietitian, during individual sessions and telephone calls. Mobile text messaging will be used to reinforce information presented at the individual sessions and thereby foster adherence to dietary advice. Diet prescriptions will differ only in regard to the specificity of recommendations regarding water consumption and physical activity recommendations will not differ between groups. The frequency and content of text messages will be consistent between the experimental and control groups, with the exception that the experimental group will receive an additional phrase with each message to encourage the "8 x8" water recommendation.

A registered dietitian will communicate with each participant one time per month, either during an individual session or by telephone. Individual sessions will include nutrition classes, taste testing, hands-on activities, and opportunities for questions and answers. Text messages will be sent on a daily basis.

Study outcomes will be assessed at baseline and at regular intervals throughout the 6 months of the study.

ANALYSIS PLAN:

The blinding of the randomization will be broken on or after July 28, 2014 and the data will be analyzed according to the following plan. All analyses will follow the intention-to-treat principle, attributing each subject to his or her assigned diet regardless of compliance. Baseline characteristics will be compared between the diet groups using the Fisher exact test for categorical variables and t-test for continuous variables. The 6-month change from baseline in the primary and secondary outcomes will be compared between groups using a general linear model, adjusting for baseline covariates that are potentially correlated with the outcome. These include demographics, socioeconomic status, anthropometrics, physical activity, and beverage consumption. We will further test covariates for potential interaction, i.e., differential effect on outcome in the two trial arms. The null hypothesis is that the 6-month change from baseline will not differ between diet groups.

Type d'étude

Interventionnel

Inscription (Réel)

38

Phase

  • N'est pas applicable

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Lieux d'étude

  • États-Unis
    • Massachusetts
      • Boston, Massachusetts, États-Unis, 02115
        • Children's Hospital Boston

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

12 ans à 17 ans (Enfant)

Accepte les volontaires sains

Oui

Sexes éligibles pour l'étude

Tout

La description

Inclusion Criteria:

  • BMI ≥ 85th percentile for sex and age according to CDC growth charts
  • Access to a working telephone and cell phone
  • At least one parent willing and able to participate in the intervention with the subject
  • Residing in predominately one household (no more than one weekend every two weeks in a secondary household)
  • Medical clearance from a primary care provider or treating physician to rule out any major medical illness, disability, or disorder (e.g., liver disease, renal failure, cancer)

Exclusion Criteria:

  • Intake of more than 4 cups (250 mL per cup) of water per day
  • BMI ≥ 40 kg/m2
  • Currently smoking (> 1 cigarette in the past week)
  • Major surgery within the previous 6 months
  • Does not have a primary care provider
  • Physician diagnosis of a major medical illness (e.g. diabetes)
  • Previous diagnosis of an eating disorder
  • Physical, mental, or cognitive handicaps that prevent participation
  • Chronic use of medications that may affect study outcomes (e.g. stimulants or diuretics)
  • Another member of the family (first degree relative) or household participating in the study
  • A friend, classmate or coworker participating in the study with whom they have contact with one or more times per week
  • Girls who are pregnant, planning to become pregnant in the next 6 months, lactating, or within 6 months postpartum

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Traitement
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation parallèle
  • Masquage: Seul

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Expérimental: Diet + Water
Participants will be counseled to follow a standard weight-reducing diet including consumption of 1) ample vegetables, fruits, and legumes; 2) whole rather than refined grains; and 3) high-quality proteins at most meals and snacks. Moreover, we will recommend limiting intake of added fats and sugars and avoiding juices and sugar-sweetened beverages (per standard practice). Participants will also be counseled to increase their water intake to 8 cups per day, consistent with the popular "8 × 8" recommendation (eight 8-oz glasses of water).
Comportemental: Dietary counseling
Participants will receive personalized dietary counseling to promote behavior change
Comparateur actif: Diet
Participants will be counseled on the same standard weight-reducing diet, as described above, with no specific advice regarding water consumption. Furthermore, no specific dietary recommendations will be provided on altering fluid/beverage intake, other than to decrease calorie-containing beverages as noted above. When participants ask for a recommendation regarding water intake, they will be advised that drinking plain water is the best way to satisfy thirst and instructed to drink when thirsty.
Comportemental: Dietary counseling
Participants will receive personalized dietary counseling to promote behavior change

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Délai
Body mass index
Délai: 6 month change
6 month change

Mesures de résultats secondaires

Mesure des résultats
Délai
Body fat percentage
Délai: 6 month change
6 month change
Body circumferences
Délai: 6 month change
6 month change
Urine specific gravity
Délai: Change throughout 6 months
Change throughout 6 months
Hunger, satiety, and palatability ratings
Délai: 6 month change
6 month change
Diet quality
Délai: 6 month change
6 month change
Satisfaction rating
Délai: 6 months
6 months
Immune status
Délai: 6 month change
6 month change
Cardiovascular risk factors
Délai: 6 month change
6 month change
Diabetes risk factors
Délai: 6 month change
6 month change

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Boston Children's Hospital

Publications et liens utiles

La personne responsable de la saisie des informations sur l'étude fournit volontairement ces publications. Il peut s'agir de tout ce qui concerne l'étude.

Publications générales

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude

1 février 2011

Achèvement primaire (Réel)

1 juin 2014

Achèvement de l'étude (Réel)

1 juin 2014

Dates d'inscription aux études

Première soumission

5 janvier 2010

Première soumission répondant aux critères de contrôle qualité

5 janvier 2010

Première publication (Estimation)

7 janvier 2010

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Estimation)

29 juillet 2015

Dernière mise à jour soumise répondant aux critères de contrôle qualité

27 juillet 2015

Dernière vérification

1 juillet 2015

Plus d'information

Termes liés à cette étude

Autres numéros d'identification d'étude

  • X09-11-0587

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .

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