DIT After RYGB - A Prospective Study (DIT RYGB)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01759667
Recruitment Status : Completed
First Posted : January 3, 2013
Last Update Posted : January 3, 2013
Information provided by (Responsible Party):
Silvia Leite Faria, Gastrocirurgia, Brazil

Brief Summary:
Bariatric surgery is the only satisfactory treatment for loss and weight maintenance in obese patients. This loss is a result of several factors that go beyond the simple anatomical abnormality of the gastrointestinal tract and may be the product of post-op energy expenditure changes. The respiratory quotient (RQ) and diet-induced thermogenesis (DIT) are important components of energy expenditure and possible changes in them can perform an important role in weight loss after Roux-en-Y Gastric Bypass (RYGB). Previously, we conducted a cross-sectional study where we measured the RQ and DIT in pre and post-op RYGB patients, which was published in the Surgery of Obesity and Related Diseases (SOARD) journal. The objective of this study is to perform a prospective analysis of these same variables (RQ and DIT), evaluating them in the same patients, when pre and postoperatively.

Condition or disease Intervention/treatment Phase
Obesity Morbid Obesity Bariatric Surgery Other: A standard mixed Meal Not Applicable

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 13 participants
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Diet-induced Thermogenesis After Roux-en-Y Gastric Bypass - A Prospective Study
Study Start Date : August 2012
Actual Primary Completion Date : October 2012
Actual Study Completion Date : October 2012

Arm Intervention/treatment
Experimental: A standard mixed Meal
The standard mixed meal was composed of a chicken salad sandwich and 200ml of coconut water, totalling 260 kcal, distributed among carbohydrates (62%), proteins (12%) and lipids (26%).
Other: A standard mixed Meal
All patients underwent an indirect calorimetry test, after a 12-h period of fasting from food and water, avoiding intake of alcohol or coffee, and avoiding physical exercise and cigarettes the day before the examination. To examine possible changes in the thermogenic effect of food, patients received a standard mixed meal (200 ml coconut water and a chicken salad sandwich using whole wheat bread). They then repeated the test 20 min and 60 min after eating to obtain a reading of the metabolic rate by considering DIT and the RQ in the postprandial period.

Primary Outcome Measures :
  1. Post-op DIT increase [ Time Frame: 2 months ]
    A post-op increase in DIT is expected to be greater than in pre-op period and may be a positive predictor for weight loss during the post-op phase.

Secondary Outcome Measures :
  1. Post-op RQ increase [ Time Frame: 2 months ]
    A postprandial increase in RQ greater than that in the pre-op phase is expected showing improvement in carbohydrate metabolism after RYGB.

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Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Pre-op: Body mass index (BMI) ≥ 40 kg/m2 or BMI ≥ 35 kg/m2 with associated co-morbidities. Age > 18 years
  • Post-op: Patients who underwent surgery ≥ 12 months by the Head Surgeon of the Gastrocirurgia de Brasilia Clinic;

Exclusion Criteria:

  • Patients aged > 65 years. Severe heart and/or respiratory problems; Pregnant women.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01759667

Gastrocirurgia de Brasilia
Brasilia, Distrito Federal, Brazil, 70390-108
Sponsors and Collaborators
Silvia Leite Faria
Principal Investigator: Silvia L Faria, M.Science Gastrocirurgia de Brasilia

Responsible Party: Silvia Leite Faria, Nutritionist, Master of Science in Human Nutrition, Gastrocirurgia, Brazil Identifier: NCT01759667     History of Changes
Other Study ID Numbers: 002
First Posted: January 3, 2013    Key Record Dates
Last Update Posted: January 3, 2013
Last Verified: December 2012

Keywords provided by Silvia Leite Faria, Gastrocirurgia, Brazil:
Diet-induced Thermogenesis;
Respiratory Quotient;
Roux-en-Y Gastric Bypass;
Energy Expenditure.

Additional relevant MeSH terms:
Obesity, Morbid
Nutrition Disorders
Body Weight
Signs and Symptoms