This research is looking at whether daily, long-term intermittent fasting can help prevent a rise in PSA levels in men who have been treated for prostate cancer. PSA is a protein made by the prostate, and high levels might mean the cancer is coming back. The study involves eating during an 8-hour window each day (like 1 PM to 9 PM) and fasting the other 16 hours. This routine lasts up to 1 year or until other treatments are needed.

Key Points:

• The study lasts for up to 1 year.
• Participants need to follow the daily fasting schedule.
• Men should have had prostate surgery and a PSA level of 0.1 ng/mL or higher within 24 months of surgery.

Men who want to join should have had surgery for localized prostate cancer, not received certain treatments before surgery (like hormone therapy), and must be able to fast. This study is not suitable for those with diabetes or on hormone therapy.