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CompletedNCT03935854Updated Dec 17, 2024

Impact of a Ketogenic Diet on Metabolic and Psychiatric Health in Patients With Bipolar or Schizophrenia Illness

An interventional study of LCHF, Ketogenic Diet in Obesity, Ketogenic Dieting and Metabolic Syndrome, sponsored by Stanford University. Completed at 1 site in United States. Open to participants aged 18 Years to 75 Years. Per ClinicalTrials.gov, last updated 2024-12-17.

Sponsored by Stanford University · Not applicable, Interventional, and Treatment

Phase
Not applicable
Study type
Interventional
Enrollment
23
Allocation
Not applicable
Ages
18 Years to 75 Years
Sex
All
01

Study summary

To initiate a low-carbohydrate, high-fat (LCHF) or ketogenic dietary (KD) intervention among a cohort of outpatients with either schizophrenia or bipolar illness who also have metabolic abnormalities, overweight/obesity, and/or are currently taking psychotropic medications experiencing metabolic side effects.

Read the detailed description

Adults with mental illness represent a high-risk, marginalized group in the current metabolic and obesity epidemic. Among US adults with severe mental illness, metabolic syndrome are highly prevalent conditions having severe consequences, with patients estimated to die on average 25 years earlier than the general population largely of premature cardiovascular disease. Many psychiatric medications, particularly neuroleptics and mood stabilizers, may, in addition, contribute to metabolic side effects and weight gain. Low-carbohydrate high-fat (LCHF) or ketogenic diets (KD) have been shown to reduce cardiovascular risk in those with insulin resistance. Recent findings support the idea that bipolar disorder, along with other psychiatric diseases schizophrenia, may have roots of metabolic dysfunction: cerebral glucose hypometabolism, oxidative stress, as well as mitochondrial and neurotransmitter dysfunction which has downstream effects on synapse connections. A KD diet provides alternative fuel to the brain aside from glucose and is believed to contain beneficial neuroprotective effects, including stabilization of brain networks, reduction of inflammation and oxidative stress. The purpose of this study is to evaluate both the metabolic and psychiatric outcomes with a KD diet in this psychiatric population.

02

Conditions studied

  • Obesity
  • Ketogenic Dieting
  • Metabolic Syndrome
  • Bipolar Disorder
  • Schizophrenia
  • Weight Gain
  • Psychotropic Agents Causing Adverse Effects in Therapeutic Use
  • Brain Metabolic Disorder
03

In context

Obesity

6,296 studies on the registry are indexed under Obesity; 1,692 are open to participants now.

This study's enrollment of 23 is below the median of 78 across 4,878 interventional studies indexed under Obesity.

Browse Obesity studies →

Lead sponsor

Stanford University is the lead sponsor of 2,117 studies on the registry; 425 are open to participants now.

Of its 259 completed or terminated interventional studies of FDA-regulated products, 197 (76%) have results posted.

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

04

Who can participate

Ages eligible
18 Years to 75 Years
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  1. Age 18-75 years old
  2. Meet DSM V criteria for schizophrenia or bipolar disorder, any subtype, for > 1 year and clinically stable (with no hospitalization for past 3 months)
  3. Currently taking psychotropic medication and gained at least 5% weight since starting medication or have a BMI greater than or equal to 26 kg/m2 or presence of at least one metabolic abnormality (hypertriglyceridemia, insulin resistance, dyslipidemia, impaired glucose tolerance)
  4. Willing to consent to all study procedures and attend follow-up appointments and motivated to follow the dietary program.
  5. Sufficient control over their food intake to adhere to study diets.
  6. Willingness to regularly monitor blood pressure, glucose, dietary intake, and body weight over the 4-month trial

Exclusion criteria

Exclusion Criteria:

  1. Any subject pregnant or nursing
  2. Comorbidity of developmental delay
  3. Active substance abuse with illicit drugs or alcohol
  4. In a current severe mood or psychotic state when entering the study that would prohibit compliance with study visits or dietary program.
  5. Anyone who has been hospitalized or taken clozapine over the past 3 months
  6. Inability to complete baseline measurements
  7. Severe renal or hepatic insufficiency
  8. Cardiovascular dysfunction, including diagnosis of:

    1. Congestive heart failure
    2. Angina
    3. Arrhythmias
    4. Cardiomyopathy
    5. Valvular heart disease
  9. Any other medical condition that may make either diet dangerous as determined by the study medical team (e.g. anorexia nervosa)
05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
23 participants (actual)

Study arms

  • Experimental
    Ketogenic Diet 16 Week Group

    Patients follow ketogenic diet for 16 weeks, with monitoring of physical and psychological health and coaching support

    Other: LCHF, Ketogenic Diet

Interventions

  • OtherLCHF, Ketogenic Diet

    Low Carbohydrate, Moderate Protein, High Fat Ketogenic Dietary Intervention 16 weeks

06

What researchers measure

Primary outcomes

  1. Change in heart rate from baseline

    Heart rate recorded at 9 visits during study

    Time frame: Baseline, 16 weeks

  2. Change in blood pressure from baseline

    Blood pressure recorded at 9 visits during study

    Time frame: Baseline, 16 weeks

  3. Change in weight from baseline

    Weight recorded at 9 visits during study

    Time frame: Baseline, 16 weeks

  4. Change in waist circumference from baseline

    waist circumference measured at 9 visits during study

    Time frame: Baseline, 16 weeks

  5. Change in visceral fat mass from baseline

    Body composition (SECA) recorded at 5 visits during study

    Time frame: Baseline, 16 weeks

  6. Change in body fat mass from baseline

    Body composition (SECA) recorded at 5 visits during study

    Time frame: Baseline, 16 weeks

  7. Percent Change in Hemoglobin A1c from baseline

    Hemoglobin A1c recorded at initial and final visits

    Time frame: Baseline, 16 weeks

  8. Change in insulin resistance measure (HOMA-IR) from baseline

    HOMA-IR measured at initial and final visits

    Time frame: Baseline, 16 weeks

  9. Change in inflammatory marker (hsCRP) from baseline

    hsCRP measured at initial and final visits

    Time frame: Baseline, 16 weeks

  10. Change in lipid profile TG (triglycerides) from baseline

    Lipid profile TG measured at initial and final visits

    Time frame: Baseline, 16 weeks

  11. Change in lipid profile small LDL (small dense LDL) from baseline

    Lipid profile small LDL measured at initial and final visits

    Time frame: Baseline, 16 weeks

  12. Change in lipid profile (HDL) from baseline

    Lipid profile HDL measured at initial and final visits

    Time frame: Baseline,16 weeks

Secondary outcomes

  1. Psychiatric Indices - Mood

    Change in Mood Qualitative Score (Clinical Mood Monitoring) from baseline

    Time frame: Baseline, 16 weeks

  2. Psychiatric Indices- Clinical Global Impression

    Change in Clinical Global Impression Scales (CGI) from baseline 1-7 scale. 1= not at all ill, 7= among the most extremely ill patients)

    Time frame: Baseline, 16 weeks

  3. Generalized Anxiety Disorder - GAD-7 Anxiety

    Change in Generalized Anxiety Symptom (GAD-7) scale from baseline. 0-15+ scale. (0= no anxiety, 15+= severe anxiety)

    Time frame: Baseline, 16 weeks

  4. Patient Health Questionnaire - PHQ-9 Depression

    Change in Patient Health Questionnaire (PHQ-9) from baseline. Score range 0-27 (0= no depression, 27= severe depression)

    Time frame: Baseline, 16 weeks

  5. Psychiatric Indices- Global Assessment of Functioning

    Change in Global Assessment of Functioning (GAF) Scale from baseline. 1-100 scale (1= persistent danger of hurting self or others, 100= superior functioning)

    Time frame: Baseline, 16 weeks

  6. Psychiatric Indices- Quality of Life

    Change in Manchester Quality of Life Scale (MANSA) from baseline. Range 12-84 (each of 12 outcomes rated from 1= could not be worse to 7= could not be better; \<4= dissatisfied with QoL, \>4= satisfied with QoL)

    Time frame: Baseline, 16 weeks

  7. Psychiatric Indices- BPRS

    Change in Brief Psychiatric Rating Scale (BPRS) from baseline. Score range 18-126. (For each of 18 symptoms, 1=symptom not present, 7= extremely severe)

    Time frame: Baseline, 16 weeks

  8. Pittsburgh Sleep Quality Index - PSQI

    Change in Pittsburgh Sleep Quality Index from baseline. 0-21 scale (\<5=good sleeper; 5+= meaningfully disturbed sleep or poor sleeper)

    Time frame: Baseline, 16 weeks

07

Study locations

1 site
  • Stanford University Department of Psychiatry & Behavioral Sciences
    Stanford, California 94305, United States
08

References and documents

Publications

  • Sethi S, Sinha A, Gearhardt AN. Low carbohydrate ketogenic therapy as a metabolic treatment for binge eating and ultraprocessed food addiction. Curr Opin Endocrinol Diabetes Obes. 2020 Oct;27(5):275-282. doi: 10.1097/MED.0000000000000571. PubMed 32773576 ↗
  • Carmen M, Safer DL, Saslow LR, Kalayjian T, Mason AE, Westman EC, Sethi S. Treating binge eating and food addiction symptoms with low-carbohydrate Ketogenic diets: a case series. J Eat Disord. 2020 Jan 29;8:2. doi: 10.1186/s40337-020-0278-7. eCollection 2020. Erratum In: J Eat Disord. 2023 Sep 29;11(1):171. doi: 10.1186/s40337-023-00881-1. PubMed 32010444 ↗
  • Norwitz NG, Sethi S, Palmer CM. Ketogenic diet as a metabolic treatment for mental illness. Curr Opin Endocrinol Diabetes Obes. 2020 Oct;27(5):269-274. doi: 10.1097/MED.0000000000000564. PubMed 32773571 ↗
  • Yu B, Ozveren R, Sethi Dalai S. Ketogenic diet as a metabolic therapy for bipolar disorder: Clinical developments. Submitted to Journal of Affective Disorders. Research Square preprint March 2020: DOI is: 10.21203/rs.3.rs-334453/v1
  • Brietzke E, Mansur RB, Subramaniapillai M, Balanza-Martinez V, Vinberg M, Gonzalez-Pinto A, Rosenblat JD, Ho R, McIntyre RS. Ketogenic diet as a metabolic therapy for mood disorders: Evidence and developments. Neurosci Biobehav Rev. 2018 Nov;94:11-16. doi: 10.1016/j.neubiorev.2018.07.020. Epub 2018 Jul 31. PubMed 30075165 ↗
  • Sarnyai Z, Kraeuter AK, Palmer CM. Ketogenic diet for schizophrenia: clinical implication. Curr Opin Psychiatry. 2019 Sep;32(5):394-401. doi: 10.1097/YCO.0000000000000535. PubMed 31192814 ↗
  • Sethi S, Wakeham D, Ketter T, Hooshmand F, Bjornstad J, Richards B, Westman E, Krauss RM, Saslow L. Ketogenic Diet Intervention on Metabolic and Psychiatric Health in Bipolar and Schizophrenia: A Pilot Trial. Psychiatry Res. 2024 May;335:115866. doi: 10.1016/j.psychres.2024.115866. Epub 2024 Mar 20. PubMed 38547601 ↗

Study documents

  • Informed consent form · Dec 15, 2021

Documents are hosted by the registry — open the source record to download them.

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 Dec 17, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT03935854
Lead sponsor
Stanford University
Responsible party
Shebani Sethi (Clinical Assistant Professor, Stanford University) — Principal investigator
First posted
May 2, 2019
Start date
Feb 13, 2019
Primary completion
Aug 11, 2022
Completion
Aug 11, 2022
Last update
Dec 17, 2024

Study contacts

Shebani Sethi, MD
principal investigator · Stanford University

Oversight

Data monitoring committee
No
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 Dec 2024. You cannot join it, but the record below documents what was studied.

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