What Should You Eat During and After Prostate Cancer Treatment?

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Medically Approved by Dr Aqua Asif (May 1st 2025) and Mr Marc Laniado Consultant Urologist GMC: 3343931. (24/3/2026)

Written by FTC Medical team 

At a Glance 

No single diet cures or prevents prostate cancer, but eating well supports your body through treatment and recovery. A balanced, whole-food diet — rich in vegetables, wholegrains, and healthy fats — can help manage side effects, maintain energy, and support long-term wellbeing. At The Focal Therapy Clinic, our team advises patients on nutrition before and after focal therapy, with most men returning to a normal diet within a week of treatment.

Balanced whole foods – Emphasise cruciferous vegetables, cooked tomatoes (lycopene), wholegrains, lean protein, and healthy fats like olive oil
Treatment-stage nutrition – Light, low-fibre meals before focal therapy; soft foods and clear fluids immediately after; normal diet within about a week
Side effect management – Small, frequent meals and nutrient-dense drinks help with nausea, fatigue, and appetite changes during treatment
Alcohol and smoking – Limit alcohol to NHS guidelines (≤14 units/week) and quit smoking to support recovery and reduce health risks
No miracle foods – Supplements and “cancer-fighting” foods lack strong evidence; focus on overall dietary pattern and always discuss supplements with your clinician

Each year, over 55,000 men in the UK are diagnosed with prostate cancer (Cancer Research UK), making it the most common cancer affecting men. While no diet can cure prostate cancer, good nutrition plays a valuable supporting role — helping manage treatment side effects, maintaining energy levels, and contributing to overall wellbeing throughout diagnosis, treatment, and recovery.

Whether you’re preparing for focal therapy, undergoing active surveillance, or recovering from a radical prostatectomy or radiotherapy , making thoughtful dietary choices can make a real difference. At The Focal Therapy Clinic, our team advises patients on nutrition at every stage.

Read: stages of prostate cancer

What is a healthy diet for men with prostate cancer?

There is no single “prostate cancer diet,” but a balanced, whole-food eating pattern provides the nutrients your body needs to support your immune system, maintain energy, and manage a healthy weight during and after treatment. The NHS Eatwell Guide recommends building meals around vegetables, wholegrains, and lean protein — principles that form an excellent foundation for men living with prostate cancer.

While there’s no single “prostate cancer diet,” general healthy eating principles apply and form a great foundation:

At The Focal Therapy Clinic, we advise patients to focus on nutrient-rich whole foods as part of their treatment preparation and recovery. The key dietary principles include:

• Eat plenty of fruit and vegetables: Aim for at least five portions a day, incorporating a variety of colours. Vegetables like broccoli, cauliflower, kale (cruciferous vegetables), and cooked tomatoes (rich in lycopene) are often highlighted in research, but variety is key.
• Choose wholegrains and high-fibre starchy foods: Opt for oats, brown rice, wholemeal bread, and quinoa over refined grains.
• Include protein-rich foods: Fish (especially oily fish like salmon or mackerel, rich in omega-3), poultry, beans, lentils, nuts, and tofu are good choices.
• Limit processed and red meat: Reduce intake of sausages, bacon, ham, beef, pork, and lamb.
• Choose healthy fats: Use unsaturated fats like olive oil or rapeseed oil instead of saturated fats found in butter, lard, and fatty meats. Nuts, seeds, and avocados are also good sources of healthy fats.
• Dairy and calcium: Dairy foods (milk, yoghurt, cheese) are good sources of calcium, important for bone health. Choose lower-fat options where possible. Men on hormone therapy need extra calcium (around 1200-1500mg daily) to counteract bone thinning, but generally, avoid consuming excessive amounts (over 1500mg daily) from supplements or diet. Good non-dairy sources include calcium-fortified plant milks/yoghurts, leafy greens, and tinned fish with bones (like sardines). Speak to your doctor if you’re concerned about your calcium intake or bone health, especially if on hormone therapy.
• Reduce added sugar and salt: Be mindful of sugar in drinks and processed foods, and limit salt intake.
• Stay hydrated: Drink plenty of fluids throughout the day, primarily water.

How can prostate cancer and its treatment affect diet?

Most prostate cancer treatments can temporarily affect appetite and eating habits, though the extent varies by treatment type. Focal therapies like typically cause fewer dietary disruptions than surgery, radiotherapy, or chemotherapy — with most men returning to normal eating within a week. More intensive treatments may require longer dietary adjustment.

Common side effects that can affect diet include:

• Nausea or taste changes: Often associated with chemotherapy or sometimes hormone therapy.
• Fatigue: Can reduce motivation to shop, cook, or eat.
• Bowel problems: Constipation or diarrhoea can result from radiotherapy, certain medications, or stress. Adjusting fibre intake (sometimes needing more, sometimes less, depending on the problem) and fluid intake is often helpful.
• Loss of appetite or unintentional weight loss: Can occur due to the cancer itself or treatment side effects.

Eating smaller, more frequent meals, choosing softer foods, or opting for nutrient-dense drinks (like smoothies or soups) can sometimes help manage these issues.

Emotional wellbeing also plays a significant role. Feeling anxious, low, or overwhelmed can naturally reduce interest in food. Support from partners, family, friends, or referral to a registered dietitian can make a positive difference in maintaining good nutrition during challenging times.

How do Alcohol and smoking affect prostate cancer recovery?

Both alcohol and smoking can affect recovery from prostate cancer treatment. The NHS recommends limiting alcohol to no more than 14 units per week, spread over several days — roughly six pints of beer or six medium glasses of wine. At The Focal Therapy Clinic, we advise patients to avoid alcohol entirely for at least one week after focal therapy to support bladder healing.

Smoking is linked to numerous health problems and may increase the risk of cancer recurrence or other complications after treatment. Quitting smoking is one of the best things you can do for your overall health. Free support for quitting smoking is available through GPs, local clinics, and trusted online services.

Diet considerations for different stages and treatments

Nutritional needs might shift depending on the stage of prostate cancer and the specific treatment plan.

• Early stages: The focus is usually on maintaining a healthy, balanced diet to support overall wellbeing and potentially reduce the risk of progression, although strong evidence for specific diets preventing progression is limited.
• During/after Treatment: The emphasis might shift towards managing side effects, maintaining energy levels, and supporting recovery. Meals should ideally be easy to digest and nutrient-dense.

Following a healthy eating pattern is part of a broader care pathway that supports both physical and emotional health throughout the prostate cancer journey.

Diet before focal therapy for prostate cancer

In the immediate days leading up to a focal therapy procedure such as NanoKnife, specific dietary instructions might be given, often involving a focus on light and easily digestible meals to ensure the bowel is clear. Always follow the specific advice provided by your clinical team. General tips may include:

• Focusing on low-fibre foods for a day or two beforehand (check with your team).
• Avoiding large, heavy meals the day before.
• Ensuring good hydration with clear fluids.

It is essential to follow the precise dietary preparation instructions given by the clinic performing your procedure.

Diet after focal therapy treatment

Immediately after focal therapy, the advice is usually to start with fluids and gradually reintroduce soft, easily digestible foods. The aim is to support healing and avoid irritating the bladder or bowel during recovery.

• Initial phase: Often clear fluids, then progressing to soups, yoghurts, smoothies, mashed vegetables, porridge.
• Avoid irritants: It’s generally recommended to avoid caffeine, alcohol, spicy foods, and highly acidic foods for several days to a week, as these can irritate the bladder or bowel.
• Fibre: Reintroduce fibre gradually to avoid constipation or bloating. Cooked vegetables and soft fruits are good starting points.
• Hydration: Drinking plenty of water is important for urinary health and bowel function.

Most men can return to their normal healthy diet within a week or so, but listen to your body and follow any specific advice from your clinical team. Many choose to maintain a healthy, balanced diet long-term for overall wellbeing.

“We often schedule procedures for the late afternoon, and even if treated late, most patients can still go home that evening. Recovery is quick — most men are back to normal eating within a few days.”
Mr Tim Dudderidge.  Consultant urologist GMC: 4505451

FAQs

What is a good diet for prostate cancer?

There isn’t one specific “prostate cancer diet,” but a generally healthy, balanced diet is recommended. This typically involves plenty of fruits and vegetables (aim for variety), wholegrains (like brown rice, oats, wholemeal bread), lean proteins (fish, poultry, beans, lentils), and healthy fats (like olive oil, nuts, seeds). Limiting red meat, processed meats, sugary foods and drinks, and saturated fats is also advised. Some studies suggest potential benefits from specific foods like cooked tomatoes (lycopene) and cruciferous vegetables (broccoli, kale), but the overall dietary pattern is more important than individual foods.

Can prostate cancer be reversed by diet?

There is currently no strong evidence to suggest that diet alone can reverse or cure prostate cancer. A healthy diet can support your overall health, help manage treatment side effects, and may play a role alongside medical treatment in managing the disease, but it cannot replace conventional medical therapies like surgery, radiotherapy, hormone therapy, or focal therapy. Be wary of claims suggesting otherwise.

Can diet prevent prostate cancer?

While no diet can guarantee prevention, maintaining a healthy lifestyle, including a balanced diet low in red/processed meat and saturated fat, and rich in fruits and vegetables, along with regular exercise and maintaining a healthy weight, may help reduce the overall risk of developing prostate cancer, particularly aggressive forms. However, other factors like age, ethnicity, and family history play a significant role.

What foods ‘kill’ prostate cancer cells naturally?

This is a common misconception. No specific food has been scientifically proven to “kill” prostate cancer cells in the human body. Some laboratory studies on cells or animals suggest compounds in certain foods (like lycopene in tomatoes, sulforaphane in broccoli, or curcumin in turmeric) might affect cancer cell growth, but this doesn’t translate directly to humans eating those foods. Focus on a varied, balanced diet rather than relying on specific “cancer-fighting” foods or high-dose supplements, which can sometimes be harmful or interfere with treatment. Always discuss supplement use with your doctor.

What diet should you be on during and after focal therapy treatment?

Immediately before focal therapy, you’ll likely need to follow specific instructions from your clinic, often involving clear fluids or light foods. Immediately after, the focus is on fluids and soft, easily digestible foods, avoiding irritants like caffeine, alcohol, and spicy food for several days. Gradually reintroduce fibre. Most men return to their normal healthy diet within about a week, but always follow your clinical team’s specific advice.

References

NHS. (n.d.). The Eatwell Guide. Retrieved from https://www.nhs.uk/live-well/eat-well/food-guidelines-and-food-labels/the-eatwell-guide/

Cancer Research UK. (n.d.). Prostate cancer statistics. Retrieved from https://www.cancerresearchuk.org/health-professional/cancer-statistics/statistics-by-cancer-type/prostate-cancer

World Cancer Research Fund/American Institute for Cancer Research. (2018). Diet, Nutrition, Physical Activity and Cancer: a Global Perspective. Continuous Update Project Expert Report 2018. Retrieved from https://www.wcrf.org/diet-activity-and-cancer/cancer-prevention-recommendations/

Cancer Research UK. (n.d.). Prostate cancer risks and causes. Retrieved from https://www.cancerresearchuk.org/about-cancer/prostate-cancer/risks-causes#Lifestylefactors0

Prostate Cancer UK. (n.d.). Diet and prostate cancer. Retrieved from https://prostatecanceruk.org/prostate-information-and-support/living-with-prostate-cancer/your-diet-and-physical-activity

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