Very Low Calorie Diet Weight Loss
- Conditions
- ObesityVery Low Calorie Diet
- Interventions
- Other: Stable isotope amino acid infusion
- Registration Number
- NCT02780206
- Lead Sponsor
- Texas A&M University
- Brief Summary
Understanding how foods and nutrients are digested, absorbed and metabolized when weight is stable and during weight loss induced by very low calorie diet procedure using the technologies of genomics, transcriptomics, proteomics, metabolomics and fluxomics ("omics") will enable generation of new hypotheses that could explain the inter-individual differences in weight loss and could lead to optimization and individualization of therapies designed to lose weight.
- Detailed Description
The overarching hypothesis is that there are baseline, pre- and post-diet combinations of 'omics' signatures in response to food and nutrients that explain the weight loss response of obese subjects to the very low calorie (VLC) diet.
In order to address the general hypothesis the following specific aims will be addressed:
Specific Aim 1: To test the hypothesis that there is a combination of 'omics' parameters in response to a defined meal that discriminate between morbidly obese subjects.
Specific Aim 2: To test the hypothesis that variation in % weight loss to the 2-weeks of VLC diet is related to baseline genomic markers, gene expression profile, proteomic and metabolomic signatures as well as baseline metabolic and substrates fluxomics response to a defined meal.
Specific Aim 3: To test the hypothesis that variation in % weight loss to the 4-weeks of VLC diet is related to baseline genomic markers, gene expression profile, proteomic and metabolomic signatures as well as baseline metabolic and substrates fluxomics response to a defined meal.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 56
Not provided
Not provided
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description obese Stable isotope amino acid infusion screening visit: body weight and composition by DXA, height, and vital signs will be assessed. Subjects may sign a medical release form to obtain medical and psychological information about them that will help determine study eligibility or can be used for later coding. 3 study days (one baseline, one approx 2 weeks of diet, one post-diet): muscle mass and function tests, resting energy expenditure, stable isotope infusions with blood draws, and questionnaires regarding quality of life, mood and depression, diet.
- Primary Outcome Measures
Name Time Method Change in net whole-body protein synthesis 0, 2, 5, 10, 15, 20, 30, 40, 50, 60, 90, 120, 150, 180, 210, 225, 240, 260, 280, 300, 320, 340, 360 ± 5 min Change in whole-body protein synthesis rate after intake of meal
- Secondary Outcome Measures
Name Time Method Group differences in activity as measured by Physical Activity Scale for the Elderly (PASE) Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 questionnaire is intended for use in an elderly population and focuses on 3 types of activities: leisure time activities, household activities and work-related activities.
Group differences in attention and executive functions as measured by Stroop Color-Word Test (SCWT) Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 a word page with words printed in black ink, a color page with blocks printed in color, and a color-word page where the color and the word do not match. The examinee reads the words or names the ink colors as quickly as possible within a time limit. Measures selective attention and inhibitory control. The total time in seconds was reported for each trial.
Group differences in state of mood as measured by the Profile of Mood State (POMS) Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 A psychological distress scale to measure mood disturbance in 6 domains - fatigue-inertia, vigor-activity, tension-anxiety, depression-dejection, anger-hostility, and confusion-bewilderment. Healthy populations take 3 to 7 minutes to complete, and others may take up a bit longer.
Group differences in state of mood as measured by the Hospital Anxiety and Depression Scale (HADS) Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 a fourteen item self-assessment scale. Seven of the items related to anxiety and seven relate to depression. Each item on the questionnaire is scored from 0-3 and this means that a person can score between 0 (no symptoms) and 21 (severe symptoms) for either anxiety or depression.
Group differences in learning and memory as measured by Auditory Verbal Learning Test (AVLT) Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 Auditory Verbal Learning Test (AVLT): a verbal episodic memory test that evaluates a wide diversity of functions: short-term auditory-verbal memory, rate of learning, retention and recognition of information
Executive Function-Adolescent/Adult Sensory Profile (ASP) Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 a standardized self-questionnaire that generates an individualized profile of sensory processing across four quadrants: low registration, sensation seeking, sensory sensitivity, and sensation avoiding.
Group differences in quality of life as measured by Short Form (36) Health Survey (SF36) Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 self administered questionnaire that measures each of the following eight health concepts: Physical Functioning (PF); Role-Physical (RP); Bodily Pain (BP); General Health (GH); Vitality (VT); Social Functioning (SF); Role-Emotional (RE); Mental Health (MH) as well as a reported Health Transition item (HT)
Group differences in learning and memory as measured by Controlled Oral Word Association Test (COWAT) Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 Controlled Oral Word Association Test (COWAT): The examinee is required to say as many words as they can think of in one minute that begin with a given letter of the alphabet. The task contains three trials. Measures phonetic verbal fluency. The raw score (total and mean words recorded across the three trials) was reported.
Group differences in attention and executive functions as measured by PASAT Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 a measure of cognitive function that assesses auditory information processing speed and flexibility, as well as calculation ability.
Group differences in attention and executive functions as measured by Trail Making Test (TMT) Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 In Part A, the examinee is instructed to connect a set of 25 circles with numbers as quickly as possible while maintaining accuracy. In Part B, the examinee is instructed to connect a set of 25 circles, alternating between numbers and letters, as quickly as possible while maintaining accuracy. Measures attentional resources and is a measure of the frontal lobe "executive" functions of visual search, set-switching and mental flexibility. The total time in seconds was reported for each measure.
Skeletal muscle strength on study day 1 and the change from day 2 and day 3 handgrip and kin-com 1-leg test
24 hour diet recall on study day 1 and the change from day 2 and day 3 The subject is asked to recall in detail all the food and drink consumed during the 24 hours prior to the test day.
Respiratory muscle strength on study day 1 and the change from day 2 and day 3 Maximum inhalation and exhalation pressure
Body Composition on study day 1 and the change from day 2 and day 3 Body composition as measured by Dual-Energy X-ray Absorptiometry on study day 1 and the change from day 2 and day 3
Group differences in overall cognitive abilities as measured by Montreal Cognitive Assessment (MoCA) Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 assesses several cognitive domains and is used for the screening of mild cognitive impairment. Total scores range from 0-30 with lower scores indicating decreased functioning.
Group differences in attention and executive functions as measured by Brief-A Postabsorptive state during 3 hours and change after feeding on study day 1 and the change from day 2 and day 3 a standardized self-report that captures views of an adult's executive functions or self-regulation in his or her everyday environment.
Gut function postabsorptive and prandial state every 20 minutes up to 6 hours before each sip feeding on day 1 and the change from day 2 and day 3 Digestion of the stable tracers of amino acid
Trial Locations
- Locations (1)
Texas A&M University-CTRAL
🇺🇸College Station, Texas, United States