Intermittent Fasting Using a Fasting-Mimicking Diet to Improve Prostate Cancer Control and Metabolic Outcomes

Phase 2

Recruiting

• Conditions: Prostate Adenocarcinoma
• Interventions: Behavioral: Standard Anti-Cancer Diet; Behavioral: Fasting Mimicking Diet (FMD)

• Registration Number: NCT05832086
• Lead Sponsor: Stephen Freedland

Brief Summary

This is a Phase 2, randomized two-armed, multi-site study of 138 patients with metastatic castrate sensitive prostate adenocarcinoma. Patients will be randomized 1:1 to receive the fasting mimicking diet, or usual diet. All patients will receive standard of care treatment for their prostate cancer. The fasting mimicking diet will be consumed for 5 days per month for a total of 6 months and will be monitored by trained research dietitians.

This study aims to examine the effects of a fasting mimicking diet (5 days per month eating L-Nutra products only for 6 months) vs. usual diet on response to cancer treatment of metastatic castrate sensitive prostate adenocarcinoma.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2023-04-03
• Study First Submitted QC: 2023-04-14
• Study First Posted: 2023-04-27
• Study Start: 2023-09-13
• Status Verified: 2025-04
• Last Update Submitted: 2025-04-01
• Last Update Posted: 2025-04-03
• Primary Completion: 2028-09-30
• Study Completion: 2029-03-30

Recruitment & Eligibility

• Status: RECRUITING
• Sex: Male
• Target Recruitment: 138

Inclusion Criteria

• Metastatic castrate sensitive prostate adenocarcinoma (Adenocarcinoma prostate histologically confirmed by biopsy AND Metastatic disease confirmed biopsy, or MRI scan)
• Men receiving or planning to start first-line intensified ADT (within 30 days of registration) with abiraterone, apalutamide, enzalutamide, or darolutamide with or without current or prior chemotherapy
• Reads, writes, and understands English or Spanish and has telephone access for remote contact with the study dietitian.
• Written informed consent obtained from subject and ability for subject to comply with the requirements of the study.

Exclusion Criteria

• Allergies to any ingredients listed on the Xentigen Ingredient List
• Men with diabetes who are not on stable doses of antihyperglycemic medication for at least 6 months and without physician consent that they may safely hold antihyperglycemic medication during the 5 days of FMD
• Regularly practicing a fasting diet that in the opinion of the study physician would impact study participation
• Significant co-morbidities (i.e., cardiac, pulmonary, liver disease, ongoing alcohol/drug abuse) that in the opinion of the study physician would preclude enrollment in this study.
• Body Mass Index (BMI) <20kg/m2
• Men actively trying to lose weight OR on weight loss medications (including but not limited to Contrave, Saxenda, Xenical) or planning to receive weight loss surgery in the next six months
• Self-reported weight loss ≥ 10% in the last 6 months

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Standard Anti-Cancer Diet	Standard Anti-Cancer Diet	Standard Anti-Cancer Diet
Fasting Mimicking Diet	Fasting Mimicking Diet (FMD)	Intermittent fasting using a fasting mimicking diet

Primary Outcome Measures

Name	Time	Method
Response to cancer treatment	6 Month visit	Will be measured by the proportion of patients who achieved PSA nadir ≤0.2 ng/dL at any time point within the 6-month study and absolute PSA nadir.

Secondary Outcome Measures

Name	Time	Method
Metabolic Toxicity 3	Change from Baseline to 6 Month visit	Will be measured by the changes in fat mass (assessed via bioelectrical expedience)
Self-reported energy levels	Change from Baseline to 6 Month visit	will be measured in changes in the scores calculated from the Godin leisure-time physical activity questionnaire. Scores can range from 0 and above, with a higher score indicating a better physical activity outcome.
Castration resistance 1	6 Month visit	will be measured by Testosterone (ng/dl)
Castration resistance 2	6 Month visit	will be measured by PSA levels (ng/mL)
Metabolic Toxicity 1	Change from Baseline to 6 Month visit	Will be measured by the changes in HbA1c
Metabolic Toxicity 4	Change from Baseline to 6 Month visit	Will be measured by the changes in body weight
Self-reported overall well-being	Change from Baseline to 6 Month visit	will be measured in changes in the scores calculated from the Medical Outcomes Study Short Form Health Survey (SF-12) questionnaire. Scores can range from 12-56 with a higher score indicating a better outcome.
Metabolic Toxicity 2	Change from Baseline to 6 Month visit	Will be measured by the changes in waist circumference

Trial Locations

Locations (3)

Beckman Research Institute of the City of Hope; 🇺🇸 Duarte, California, United States

Cedars-Sinai Medical Center; 🇺🇸 Los Angeles, California, United States

Duke University; 🇺🇸 Durham, North Carolina, United States