Acute and Chronic Effects of Obesity
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Weight loss.
- Who it may be relevant to
- Registry conditions: Obesity & Overweight, Metabolism Changes, Lipid Metabolism. Basic parameters: 25 years — 40 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Canada
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Overview
The goal of this study is to understand if there are differences in the fat, muscle and metabolism of individuals who developed obesity during childhood versus those who developed obesity in adulthood. We will do this by having recruited participants undergo subcutaneous adipose tissue biopsies in the abdomen and thigh, a muscle biopsy in the thigh, collect blood and urine samples, a DEXA scan and 3 submaximal exercise tests. participants will also have their resting energy expenditure measured through indirect calorimetry to tailor a targeted weight loss protocol through caloric restriction and cardiovascular exercise (3 times a week). After 10% of weight loss is completed, study participants will repeat all tests during a 2 week weight stabilization period. At 12 weeks into the intervention, indirect calorimetry, DEXA scan and blood tests will be repeated.
Interventions
- Behavioral Weight loss
A conventional weight loss program will be implemented for participants to lose approximately 10% of their starting body weight
Primary outcome measures
- Immune cell quantification [Time frame: 4 years]
- Pre-adipocyte and adipocyte characteristics [Time frame: 5 years]
- Muscle and adipose tissue interaction [Time frame: 5 years]
- Blood inflammatory markers [Time frame: 5 years]
Eligibility criteria
Inclusion criteria
We are recruiting two groups of sedentary or untrained males and pre-menopausal females (age 25-40 years) with body mass indices (BMI) between 30.0-39.9 kg/m\^2. All participants will be required to provide a medical record and/or photographic evidence of weight at childhood (around age of 10-17 years old). Individuals with BMI between 40.0-41.9 may be included in the case that an individual with a much shorter height falls within this range, as BMI does not always properly define obesity type. Once the participant completes their DEXA scan, we will be able to more accurately assess the participant's obesity level and re-evaluate their elgibility.
Exclusion criteria
Participants will be excluded if they are pregnant or planning to become pregnant, breast-feeding, presently using nicotine containing products (e.g. cigarettes, chewing tobacco, nicotine gum etc.), taking certain anti-depressants and anti-hypertensives. More modern medications will not need to be excluded as they don't affect weight loss or weight gain. As medication use will be screened, if the participant is using medications that do not affect our outcomes they will be included in the study. Participants will also be excluded if they have had any surgery (e.g. gastric bypass, magnetic implants) or have any conditions (e.g. iron deficiency anemia) or diseases (e.g. diabetes, cancer, IBD, history of eating disorders or mental illness) that may affect immune function and thus study outcomes, or the ability to participate in the study.
Participants must also have been weight stable for at least 2 months.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Cohort
Study locations
Canada · 2 centers
- Concordia University PERFORM Centre — Montreal
- Concordia University PERFORM Centre — Montreal
Identifiers
NCT: NCT07515547 · 10000619 · RGPIN-2020-06809