NCT06091163

Brief Summary

Depression is a debilitating chronic illness affecting 1 in 6 adults in the United Kingdom (UK) at any one time. Antidepressants and psychological therapy are the main treatments, but some people do not respond to these. Neurons and signals in the brain are greatly disrupted in people with severe depression. A ketogenic diet, a high-fat and very low-carbohydrate diet, supplies a form of energy that appears to help brain cells communicate and may improve the treatment of depression. Our goal is to find out whether a ketogenic diet could be an additional effective treatment for patients with depression for which antidepressants do not work. Using social media advertising, 100 patients, ages 18-65, who have previously tried at least two different antidepressant medications within the current depressive episode will be recruited. Enrolment, consent, and data collection will be collected online using self-report questionnaires. Participants will be allocated by minimisation 1:1 to the KD group or control group based on depressive severity (moderately severe vs. severe) and body mass index (\<30kg/m2 vs. 30+ kg/m2). The intervention group will receive 6-weeks of prepared ketogenic diet meals (3 meals with snacks per day) and weekly ketogenic diet-focused nutrition counselling. The control group will be asked to follow a diet to reduce their saturated fat intake and increase vegetable consumption by one portion a day. The control group will receive vouchers to assist with purchases and will be provided with weekly nutritional counselling. Existing treatment for depression will remain in both groups. The primary outcome is the change in depression symptoms at six weeks. All participants will complete assessments of depression and anxiety every two weeks, starting before treatment to post-intervention (week 6), and again at week 12. Additional outcomes include participants' ability to experience pleasure, quality of life, ability to socialise and work, cognitive processing, morning cortisol, and gut microbiome. At all stages of the study, adults with lived experience of depression will advise the research team to take into account the needs and views of patients. This study will provide evidence of whether following a ketogenic diet leads to a short-term improvement in depression in people whose depression cannot be relieved by antidepressants.

Trial Health

87
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
88

participants targeted

Target at P50-P75 for not_applicable

Timeline
Completed

Started Feb 2024

Shorter than P25 for not_applicable

Geographic Reach
1 country

1 active site

Status
completed

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

First Submitted

Initial submission to the registry

October 13, 2023

Completed
6 days until next milestone

First Posted

Study publicly available on registry

October 19, 2023

Completed
4 months until next milestone

Study Start

First participant enrolled

February 22, 2024

Completed
4 months until next milestone

Primary Completion

Last participant's last visit for primary outcome

June 15, 2024

Completed
4 months until next milestone

Study Completion

Last participant's last visit for all outcomes

September 30, 2024

Completed
Last Updated

February 12, 2025

Status Verified

November 1, 2024

Enrollment Period

4 months

First QC Date

October 13, 2023

Last Update Submit

February 10, 2025

Conditions

Keywords

Ketogenic DietKeto DietKetoMetabolic KetosisRandomised Controlled Trial

Outcome Measures

Primary Outcomes (1)

  • Patient Health Questionnaire (PHQ-9)

    The PHQ-9 is a previously validated and reliably self-administered 9-item questionnaire of depression severity corresponding to Diagnostic Statistical Manual 5th Edition (DSM-V) criteria for major depressive disorder. Items are scored on a 4-point scale from "0" = not at all to "3" = nearly every day. Total scores range from 0 to 27 with higher scores reflecting increased depression severity. PHQ-9 scores of 5, 10, 15, and 20 represent mild, moderate, moderately severe, and severe depression, respectively.

    Baseline, 2 weeks, 4 weeks, 6 weeks (post-intervention), 12 weeks (follow-up)

Secondary Outcomes (8)

  • General Anxiety Disorder Scale (GAD-7)

    Baseline, 2 weeks, 4 weeks, 6 weeks (post-intervention), 12 weeks (follow-up)

  • Snaith-Hamilton Pleasure Scale (SHAPS)

    Baseline, 6 weeks (post-intervention), 12 weeks (follow-up)

  • Perceived deficits questionnaire-5-item (PDQ-5)

    Baseline, 6 weeks (post-intervention), 12 weeks (follow-up)

  • The Medical Outcomes Study (MOS) 12-item Short-Form Health Survey (SF-12)

    Baseline, 6 weeks (post-intervention), 12 weeks (follow-up)

  • Work and Social Adjustment Scale (WSAS)

    Baseline, 6 weeks (post-intervention), 12 weeks (follow-up)

  • +3 more secondary outcomes

Other Outcomes (1)

  • Weight

    Baseline, 6 weeks (post-intervention), 12 weeks (follow-up)

Study Arms (2)

Ketogenic Diet (KD)

EXPERIMENTAL

Participants allocated to this condition will receive 6-weeks of home-delivered pre-prepared ketogenic diet (KD) meals (3 meals/day, snacks) from a vetted ketogenic diet food supplier. The 6-week intervention includes a weekly 30-minute dietary counselling call with a registered dietitian to support following a ketogenic diet. Participants receive educational materials with information about foods that are compatible with the diet, common symptoms and how to manage them, and strategies to help maintain the diet during and after the 6-week intervention period.

Behavioral: Ketogenic Diet

Phytonutrient Diet (PD)

PLACEBO COMPARATOR

Participants in the control group will receive weekly 30-minute dietary counselling with a registered dietitian and be asked to increase vegetable consumption and reduce saturated fat intake as part of a phytonutrient diet (PD). Participants will receive food vouchers every 2-weeks to help purchase food items or replacements that support high vegetable, low saturated fat intake. This aims to be a plausible placebo dietary treatment for depression. There is no clear evidence that these manipulations will change depression severity. The dietitian will provide materials to explain the diet and suggest foods by colour with supporting recipe suggestions.

Behavioral: Phytonutrient Diet

Interventions

Ketogenic DietBEHAVIORAL

A Ketogenic Diet (KD) is a high-fat and very low-carbohydrate intake. Participants will follow a modified KD (estimated 20-50g carbohydrates/day based on a 2000 kcal diet) without energy restriction. Participants will test for ketosis in their morning urine at least twice a week to monitor adherence. To support adherence in people with depression, delivered pre-prepared KD meals (3 meals per day) and additional ketogenic snacks will be sent to participants. A registered dietitian will provide weekly 30-minute nutritional counselling sessions. The dietitian will schedule appointments and assess the participants' experience with adhering to the KD diet, troubleshoot as required, give guidance on how to prevent or overcome side effects of KD diets, and keep record of participants' ketosis level and suicide risk.

Also known as: Keto Diet
Ketogenic Diet (KD)

Participants in the control group will receive the same degree of dietetic input and be told that their diet is a modified fat and phytonutrient diet. The photo diet aims to increase vegetable consumption, reduce saturated fat intake and increase poly- and mono-unsaturated fat intake. Participants in the control group will receive food vouchers (£20 every two weeks) to help purchase these items. This aims to be a plausible placebo dietary treatment for depression. There is no clear evidence that these manipulations will change depression severity. The dietitian will create written materials to explain the diet and suggest foods by colour with supporting recipe suggestions.

Also known as: Phyto Diet
Phytonutrient Diet (PD)

Eligibility Criteria

Age18 Years - 65 Years
Sexall
Healthy VolunteersNo
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

  • Aged 18-65 years
  • Have been diagnosed with depression
  • Currently on an antidepressant medication for a period of 4-weeks or longer
  • Have tried 2 or more antidepressant treatment trials of adequate dose and duration within the current depressive episode to which they did not fully respond. An adequate treatment trial is defined as at least 4 weeks of a medication at a minimum National Institute for Health and Care Excellence (NICE) approved dose
  • With a Patient Health Questionnaire-9 (PHQ-9) total score greater than or equal to 15 at baseline
  • Able to understand and be willing to adhere to the demands of the study
  • Provision of written informed consent
  • Have access to a tablet/computer for online assessments, follow-ups with the registered dietitian, and able to attend appointments for assessments and treatment and adhere to study procedures
  • Have both a fridge and a freezer at home
  • Complete all baseline assessments

You may not qualify if:

  • Currently following a low carbohydrate or ketogenic diet
  • Currently following a vegan or vegetarian diet as these diets are more challenging to accommodate in a Ketogenic Diet and adding vegetables in the control group is unlikely to be seen as helpful.
  • Currently receiving, or have received, in-patient psychiatric treatment or electroconvulsive therapy (electric shock to the brain under brief general anaesthetic) within the past year, or scheduled to receive such treatment during the study
  • Currently using St John's wort or other remedies for depression that were bought without a doctor's prescription
  • Currently have suicidal ideation with intent\* or attempted suicide within the past two months
  • Ever had an eating disorder, bipolar disorder, schizophrenia, or psychosis
  • Have substance use or alcohol dependence
  • Have epilepsy
  • Have serious food allergies (experiencing food hypersensitivity that leads to anaphylaxis or other severe symptoms, which may require hospitalisation or are life-threatening) or otherwise require a special diet that cannot be accommodated within a KD such as phenylketonuria or lactose intolerance
  • Treated with insulin, sulfonylureas, Glucagon-like peptide-1 (GLP-1) agonists, or Sodium-glucose co-transporter-2 (SGLT2) inhibitors
  • Women who are pregnant, planning pregnancy in the next three months, or breastfeeding
  • Have a body mass index (BMI) of \<18.5 kg/m2
  • Have unstable or severe medical conditions (e.g., cancer, cardiovascular, renal, lung, psychiatric, or bleeding disorders, diabetes, etc.), currently receiving cancer treatment except hormonal treatment for breast cancer or non-melanoma skin cancer treatment
  • Have gallstones, renal tubular acidosis, kidney stones, small bowel malabsorption or a history of pancreatitis
  • Have scheduled a major surgery in the next 3 months
  • +5 more criteria

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

University of Oxford

Oxford, OX2 6GG, United Kingdom

Location

Related Publications (40)

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MeSH Terms

Conditions

Depressive Disorder, Treatment-ResistantDepressionMental DisordersDepressive DisorderKetosis

Interventions

Diet, Ketogenic

Condition Hierarchy (Ancestors)

Mood DisordersBehavioral SymptomsBehaviorAcidosisAcid-Base ImbalanceMetabolic DiseasesNutritional and Metabolic Diseases

Intervention Hierarchy (Ancestors)

Diet, Carbohydrate-RestrictedDiet TherapyNutrition TherapyTherapeuticsDietNutritional Physiological PhenomenaDiet, Food, and NutritionPhysiological Phenomena

Study Officials

  • Min Gao, PhD

    University of Oxford

    PRINCIPAL INVESTIGATOR
  • Megan Kirk Chang, PhD

    University of Oxford

    PRINCIPAL INVESTIGATOR
  • Paul Aveyard, PhD, FRCGP

    University of Oxford

    STUDY DIRECTOR

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
SINGLE
Who Masked
OUTCOMES ASSESSOR
Purpose
TREATMENT
Intervention Model
PARALLEL
Sponsor Type
OTHER
Responsible Party
SPONSOR

Study Record Dates

First Submitted

October 13, 2023

First Posted

October 19, 2023

Study Start

February 22, 2024

Primary Completion

June 15, 2024

Study Completion

September 30, 2024

Last Updated

February 12, 2025

Record last verified: 2024-11

Data Sharing

IPD Sharing
Will share

We plan to share the study protocol, statistical analysis plan, and individual participant data (IPD) that underlie the results in a publication.

Shared Documents
STUDY PROTOCOL, SAP
Time Frame
Data will be available after publication in a peer-reviewed journal for a period of up to 12-months.
Access Criteria
Please contact the primary investigators listed on this trial registration for access.

Locations