Tolerability/Palatability of TalityTM Synthetic Meal Replacement in Prostate Cancer

Primary Objective: Determine the appeal/tolerability/palatability of a diet consisting solely of TalityTM synthetic meal replacement in participants with prostate cancer Secondary Objective: Evaluate the effect of TalityTM on safety parameters including laboratory tests, nutritional status and adverse effects

Inclusion criteria

• Biopsy-proven prostate cancer with stable or rising PSA levels, defined as three consecutive PSA levels, each value greater than 1 week apart, with fluctuation between the three values no more than 10% downward. The third PSA needs to be within 30 days prior to enrollment and >= 0.1.
• Patients may previously have been on any regimen of chemotherapy completed at least one month prior. Patients may be on any stable form of anti-androgen therapy.
• Males >= age 18.
• All patients must have a life expectancy of > 6 months.
• Patients must have an ECOG Performance Status of <= 1
• Patients must have no clinically significant abnormalities of organ or bone marrow function
• Patients must have the ability to understand and the willingness to sign a written informed consent document, and the willingness/ability to comply with the protocol activities.

Exclusion criteria

• Chemotherapy within one month prior to enrollment or plans to receive chemotherapy within one month after enrollment. Patients who are expected to require new or modified anti-androgen therapy during the course of the study are also excluded.
• Patients may not be receiving any other Investigational Agents during the course of the study.
• Patients who experience frequent symptoms of a gastrointestinal nature (e.g., diarrhea, abdominal bloating, constipation or pain) are excluded.
• Known CNS metastases.
• Patients who, in the opinion of the Principal Investigator, have a clinically significant co-morbid disease that is likely to affect the ability of the patient to complete the trial, interfere with their ability with measurement of self-reported outcomes or result in adverse events unrelated to TalityTM are excluded.
• Patients with a history of food allergy are excluded.
• Concomitant medications necessary to treat baseline disorders are allowed (e.g., hypertension, diabetes, and hyperlipidemia).
• Patients requiring concomitant medications that, in the opinion of the Principal Investigator, have an unacceptable risk of adverse effects due to their nature (e.g., anti-coagulant therapy, immuno-modulatory agents for autoimmune disease) must be excluded.
• Pregnant or nursing patients will not be enrolled since prostate cancer is limited to males.
• HIV-positive patients with active infections, HIV related cancer or poorly controlled viral loads must be excluded. HIV-positive patients who are stable on anti-viral therapy may be enrolled.