CClinicalTrials.gg
CompletedNCT02951663Updated Mar 20, 2019

Protein Supplementation Post Bariatric Surgery

An interventional study of Protein in Bariatric Surgery Candidate, sponsored by University of North Carolina, Chapel Hill. Completed at 1 site in United States. Open to participants aged 18 Years to 70 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2019-03-20.

Sponsored by University of North Carolina, Chapel Hill · Not applicable, Interventional, and Supportive care

Phase
Not applicable
Study type
Interventional
Enrollment
48
Allocation
Randomized
Ages
18 Years to 70 Years
Sex
All
01

Study summary

Purpose: To evaluate adherence, tolerability, and total protein intake in bariatric surgery patients provided with ready-to-drink protein supplements, and to evaluate the effects of supplementation on body composition, metabolism, and health outcomes.

Participants: Patients scheduled to under go bariatric surgery aged 18-70 years old. Participants will be included if they agree to comply with the study protocol, are free of medical conditions that may contraindicate participation, and do not plan to become pregnant during the study.

Procedures (methods): Participants will complete five laboratory visits for the current study (pre-screening (visit 1), baseline testing (visit 2), and return visits at 3 weeks (visit 3), 12 weeks (visit 4), and 24 weeks (visit 5) post-surgery). The treatment group will be given a 12 week supply of a high protein, low-carbohydrate, low-fat supplement to be taken once daily during days 3-7 post-surgery, and twice daily weeks 2-12. The treatment group will follow standard of care recommendations put forth by the physician-nutritionist team, but using the provided protein supplement to meet recommendations. The control group will be asked to follow the standard of care recommendations from the physician-nutritionist team.

The primary study endpoints will be adherence, tolerability, and total protein intake in bariatric surgery patients provided with a 12-week supply of ready-to-drink protein supplements. Secondary outcomes will evaluate the effect of a protein supplement on body composition (lean mass, fat mass, percent body fat, visceral fat, muscle thickness), resting metabolic rate, clinical and endocrine blood values, functional fitness, and responses to questionnaires evaluating mood, satiety, functional independence, and health related quality of life.

02

Conditions studied

  • Bariatric Surgery Candidate
03

In context

Lead sponsor

University of North Carolina, Chapel Hill is the lead sponsor of 1,340 studies on the registry; 133 are open to participants now.

Of its 155 completed or terminated interventional studies of FDA-regulated products, 136 (88%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 70 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • Participant is scheduled for weight loss surgery
  • Participant agrees to abstain from extraneous supplementation with creatine, β-hydroxy β-methylbutyrate, carnosine, beta-alanine, taurine, or any other supplement or prescription drug that may significantly influence body composition or metabolic rate
  • Participant has provided written and dated informed consent to participate in the study
  • Participant is willing and able to comply with the protocol
  • Participant agrees to abstain from using caffeine, tobacco, and alcohol for at least 24 hours before testing days
  • Participant agrees to abstain from exercise 24 hours prior to each testing visit
  • Participant is not currently pregnant and does not desire to become pregnant in the next six months

Exclusion criteria

Exclusion Criteria:

  • Physicians on the research team believe that a pre-existing condition may influence participant safety or study outcomes, including previously diagnosed cardiovascular, metabolic, renal, hepatic, or musculoskeletal disorders
  • Participant is using, or has used one of the following dietary supplements within 8 weeks prior to enrollment: creatine, β-hydroxy β-methylbutyrate, carnosine, beta-alanine, taurine, or any other supplement or prescription drug that may significantly influence body composition or metabolic rate
  • Participant is in, or has participated in another clinical trial within 4 weeks prior to enrollment
  • Participant is pregnant or plans on becoming pregnant
  • Participant has a known allergy or sensitivity to any ingredient in the test product (determined from health history questionnaire)
05

Study design

Phase
Not applicable
Primary purpose
Supportive care
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Single (Care provider)
Enrollment
48 participants (actual)

Study arms

  • Experimental
    Protein Supplement

    Ready to drink blinded protein supplement

    Dietary Supplement: Protein

  • No intervention
    Control

    Control group

Interventions

  • Dietary supplementProtein
06

What researchers measure

Primary outcomes

  1. Number of patients reporting gastrointestinal effects during use of supplementation

    Tracked using a custom survey

    Time frame: 12 weeks

  2. Number of shakes consumed out of the total number of shakes provided

    Time frame: 12 weeks

Secondary outcomes

  1. Body fat

    measured using ultrasound

    Time frame: 12 weeks

  2. Lean body mass

    measured using ultrasound

    Time frame: 12 weeks

  3. Metabolism (resting metabolic rate)

    Time frame: 12 weeks

  4. Functional fitness (sit to stand test)

    Time frame: 12 weeks

07

Study locations

1 site
  • Exercise & Sport Science and GI Surgery UNC Hospitals
    Chapel Hill, North Carolina 27599, United States
08

References and documents

Publications

  • Hirsch KR, Blue MNM, Trexler ET, Ahuja S, Smith-Ryan AE. Provision of ready-to-drink protein following bariatric surgery: An evaluation of tolerability, body composition, and metabolic rate. Clin Nutr. 2021 Apr;40(4):2319-2327. doi: 10.1016/j.clnu.2020.10.022. Epub 2020 Oct 23. PubMed 33158590 ↗

Individual participant data

Plan to share: No

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Mar 20, 2019, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT02951663
Lead sponsor
University of North Carolina, Chapel Hill
Responsible party
Sponsor
First posted
Nov 1, 2016
Start date
Oct 2016
Primary completion
Feb 2019
Completion
Feb 2019
Last update
Mar 20, 2019

Study contacts

Abbie Smith-Ryan, PhD
principal investigator · University of North Carolina, Chapel Hill

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Mar 2019. You cannot join it, but the record below documents what was studied.

Follow this study

Get an email when the registry record changes — status, dates, results — or when someone posts here.

Sign in to follow

Discussion

Questions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.

Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.

Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.

Start the discussion