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CompletedNCT04222894Updated Apr 19, 2022

Hospital Workplace Nutrition Study

An interventional study of Plant-based diet and Control Diet in Overweight and Type2 Diabetes, sponsored by Physicians Committee for Responsible Medicine. Completed at 1 site in United States. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2022-04-19.

Sponsored by Physicians Committee for Responsible Medicine · Not applicable, Interventional, and Treatment

Phase
Not applicable
Study type
Interventional
Enrollment
22
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

The purpose of this study is to evaluate the effects of a plant-based diet on body weight, blood pressure, and plasma lipid concentrations, as part of a hospital workplace program.

Read the detailed description

Using a randomized controlled trial design, participants will be randomly assigned to either a plant-based or a control diet for 12 weeks. T Before and after each intervention period, the investigators will measure participant body weight, blood pressure, and plasma lipid concentrations.

02

Conditions studied

  • Overweight
  • Type2 Diabetes

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Keywords

  • body weight
  • blood pressure
  • lipids
  • nutrition
03

In context

Overweight

3,670 studies on the registry are indexed under Overweight; 849 are open to participants now.

This study's enrollment of 22 is below the median of 73 across 3,175 interventional studies indexed under Overweight.

Browse Overweight studies →

Lead sponsor

Physicians Committee for Responsible Medicine is the lead sponsor of 32 studies on the registry; 4 are open to participants now.

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

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  1. Employee of Sibley hospital
  2. Male or female
  3. Age at least 18 years
  4. Have a BMI >25 kg/m2
  5. Ability and willingness to participate in all components of the study
  6. A willingness to follow a plant-based diet for the duration of the study
  7. A willingness to attend weekly classes for the duration of the study
  8. A willingness to keep physical activity level consistent throughout the duration of the study

Exclusion criteria

Exclusion Criteria:

  1. Diabetes mellitus type 1 or history of any endocrine condition that would affect body weight, such as a pituitary abnormality or Cushing's syndrome
  2. Smoking during the past six months
  3. Alcohol consumption of more than 2 drinks per day or the equivalent, episodic increased drinking (e.g., more than 2 drinks per day on weekends), or a history of alcohol abuse or dependency followed by any current use
  4. Current or unresolved past drug abuse
  5. Pregnancy or plans to become pregnant in the next 12 weeks
  6. Intention to leave hospital employment in the next 12 weeks
  7. Unstable medical or psychiatric status
  8. Evidence of an eating disorder
  9. Lack of English fluency
  10. Inability to maintain current medication regimen
05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
22 participants (actual)

Study arms

  • Active comparator
    Plant-based diet

    The diet group will be asked to follow a low-fat, vegan diet for 12 weeks

    Other: Plant-based diet

  • Active comparator
    Control diet

    Half of the participants will be asked to continue their usual diets for the 12-week study period.

    Other: Control Diet

Interventions

  • OtherPlant-based diet

    Weekly instructions will be given to the participants in the intervention group about following vegan diet.

    Also known as: Vegan diet

  • OtherControl Diet

    Participants will be asked to continue their usual diets for the 12-week study period.

06

What researchers measure

Primary outcomes

  1. Body Weight

    Anticipated weight-loss for intervention group compared with control group

    Time frame: 12 weeks

  2. Blood Pressure

    Anticipated changes in blood pressure (systolic and diastolic) for intervention group compared with control group

    Time frame: 12 weeks

  3. Plasma Lipids

    Anticipated changes in plasma lipid concentrations for intervention group compared with control group

    Time frame: 12 weeks

Secondary outcomes

  1. Hemoglobin A1c

    HbA1c will be measured as an index of glycemic control.

    Time frame: 12 weeks

  2. Fasting Plasma Glucose

    Fasting Plasma Glucose will be measured as an index of glycemic control.

    Time frame: 12 weeks

  3. Absenteeism

    Absenteeism from work will be assessed by self-report at baseline and final assessments.

    Time frame: 12 weeks

  4. Quality of Life: SF-36

    Quality of life will be assessed using the SF-36, which is a brief health survey with 36 questions. The SF-36 provides an 8-scale profile of functional health and well-being scores, as well as psychometrically-based physical and mental health summary measures. The SF-36 is a general measure that has been administered across various age groups, disease spectra, and treatment regimens. Items on the SF-36 are scored on a scale of 0-100, with a higher score indicating better health-related quality of life.

    Time frame: 12 weeks

  5. Dietary Restraint, Disinhibition, Hunger

    Participants will complete an Eating Inventory form, a highly reliable 51 item questionnaire providing quantitative measures of dietary restraint (21 questions), disinhibition (16 items), and hunger (14 questions). Scores for each sub-scale are calculated by summing respective items. The scale consists of 36 true=false items and 15 forced-choice format questions. Higher scores are indicative of greater dietary restraint, disinhibition and hunger. Its principal use in the current study will be as a gauge of ease in adapting to the intervention diet, which is indicated by changes in restraint and hunger scores.

    Time frame: 12 weeks

  6. Food Acceptability: The Food Acceptability Questionnaire

    The Food Acceptability Questionnaire will measure attitudes about the intervention diet, including desire to adhere, likelihood to adhere in the future, and attitudes about accessibility of sustaining the diet. Items on the FAQ are scored on a scale of 1-7. Higher scores indicate greater food acceptability.

    Time frame: 12 weeks

07

Study locations

1 site
  • Sibley Memorial Hospital
    Washington, District of Columbia 20016, United States
08

References and documents

Publications

  • Flegal KM, Carroll MD, Ogden CL, Johnson CL. Prevalence and trends in obesity among US adults, 1999-2000. JAMA. 2002 Oct 9;288(14):1723-7. doi: 10.1001/jama.288.14.1723. PubMed 12365955 ↗
  • Hedley AA, Ogden CL, Johnson CL, Carroll MD, Curtin LR, Flegal KM. Prevalence of overweight and obesity among US children, adolescents, and adults, 1999-2002. JAMA. 2004 Jun 16;291(23):2847-50. doi: 10.1001/jama.291.23.2847. PubMed 15199035 ↗
  • Luckhaupt SE, Cohen MA, Li J, Calvert GM. Prevalence of obesity among U.S. workers and associations with occupational factors. Am J Prev Med. 2014 Mar;46(3):237-48. doi: 10.1016/j.amepre.2013.11.002. PubMed 24512862 ↗
  • Dayoub E, Jena AB. Chronic Disease Prevalence and Healthy Lifestyle Behaviors Among US Health Care Professionals. Mayo Clin Proc. 2015 Dec;90(12):1659-62. doi: 10.1016/j.mayocp.2015.08.002. Epub 2015 Oct 5. PubMed 26422242 ↗
  • Vibhute NA, Baad R, Belgaumi U, Kadashetti V, Bommanavar S, Kamate W. Dietary habits amongst medical students: An institution-based study. J Family Med Prim Care. 2018 Nov-Dec;7(6):1464-1466. doi: 10.4103/jfmpc.jfmpc_154_18. PubMed 30613543 ↗
  • Bergeron N, Al-Saiegh S, Ip EJ. An Analysis of California Pharmacy and Medical Students' Dietary and Lifestyle Practices. Am J Pharm Educ. 2017 Oct;81(8):5956. doi: 10.5688/ajpe5956. PubMed 29200450 ↗
  • Bleich SN, Bennett WL, Gudzune KA, Cooper LA. Impact of physician BMI on obesity care and beliefs. Obesity (Silver Spring). 2012 May;20(5):999-1005. doi: 10.1038/oby.2011.402. Epub 2012 Jan 19. PubMed 22262162 ↗
  • Barnard ND, Scialli AR, Bertron P, Hurlock D, Edmonds K, Talev L. Effectiveness of a low-fat vegetarian diet in altering serum lipids in healthy premenopausal women. Am J Cardiol. 2000 Apr 15;85(8):969-72. doi: 10.1016/s0002-9149(99)00911-x. PubMed 10760336 ↗
  • Yokoyama Y, Nishimura K, Barnard ND, Takegami M, Watanabe M, Sekikawa A, Okamura T, Miyamoto Y. Vegetarian diets and blood pressure: a meta-analysis. JAMA Intern Med. 2014 Apr;174(4):577-87. doi: 10.1001/jamainternmed.2013.14547. PubMed 24566947 ↗
  • Barnard ND, Cohen J, Jenkins DJ, Turner-McGrievy G, Gloede L, Jaster B, Seidl K, Green AA, Talpers S. A low-fat vegan diet improves glycemic control and cardiovascular risk factors in a randomized clinical trial in individuals with type 2 diabetes. Diabetes Care. 2006 Aug;29(8):1777-83. doi: 10.2337/dc06-0606. PubMed 16873779 ↗
  • Esselstyn CB Jr. Updating a 12-year experience with arrest and reversal therapy for coronary heart disease (an overdue requiem for palliative cardiology). Am J Cardiol. 1999 Aug 1;84(3):339-41, A8. doi: 10.1016/s0002-9149(99)00290-8. PubMed 10496449 ↗
  • Esselstyn CB Jr, Ellis SG, Medendorp SV, Crowe TD. A strategy to arrest and reverse coronary artery disease: a 5-year longitudinal study of a single physician's practice. J Fam Pract. 1995 Dec;41(6):560-8. PubMed 7500065 ↗
  • Ornish D, Brown SE, Scherwitz LW, Billings JH, Armstrong WT, Ports TA, McLanahan SM, Kirkeeide RL, Brand RJ, Gould KL. Can lifestyle changes reverse coronary heart disease? The Lifestyle Heart Trial. Lancet. 1990 Jul 21;336(8708):129-33. doi: 10.1016/0140-6736(90)91656-u. PubMed 1973470 ↗
  • Craig WJ, Mangels AR; American Dietetic Association. Position of the American Dietetic Association: vegetarian diets. J Am Diet Assoc. 2009 Jul;109(7):1266-82. doi: 10.1016/j.jada.2009.05.027. PubMed 19562864 ↗
  • Friedewald WT, Levy RI, Fredrickson DS. Estimation of the concentration of low-density lipoprotein cholesterol in plasma, without use of the preparative ultracentrifuge. Clin Chem. 1972 Jun;18(6):499-502. No abstract available. PubMed 4337382 ↗
  • Loffler A, Luck T, Then FS, Sikorski C, Kovacs P, Bottcher Y, Breitfeld J, Tonjes A, Horstmann A, Loffler M, Engel C, Thiery J, Villringer A, Stumvoll M, Riedel-Heller SG. Eating Behaviour in the General Population: An Analysis of the Factor Structure of the German Version of the Three-Factor-Eating-Questionnaire (TFEQ) and Its Association with the Body Mass Index. PLoS One. 2015 Jul 31;10(7):e0133977. doi: 10.1371/journal.pone.0133977. eCollection 2015. PubMed 26230264 ↗

Individual participant data

Plan to share: Undecided

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Apr 19, 2022, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04222894
Lead sponsor
Physicians Committee for Responsible Medicine
Collaborators
Sibley Memorial Hospital
Responsible party
Sponsor
First posted
Jan 10, 2020
Start date
Jun 26, 2020
Primary completion
Sep 30, 2021
Completion
Sep 30, 2021
Last update
Apr 19, 2022

Study contacts

Neal D Barnard, MD
principal investigator · President

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Apr 2022. You cannot join it, but the record below documents what was studied.

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