Which foods should be avoided during proton treatment

@jeffmarc Your post on foods to avoid during radiation is very helpful. I planned to ask you if the diet restrictions are only "during radiation." That's what I thought, but I asked my oncologist weeks ago and the answer was, "as long as you're on ADT."
I still had doubts. But in @daveinflorida 's experience, he had diarrhea on the third week of his 28-fraction radiation treatment after he ate pizza. I am on my third week post-radiation, so I still follow my diet restrictions. And just now, it clicked to my mind: It was the pharmacist who first communicated to me the diet restrictions, before dispensing my Orgovyx, two weeks before my radiation treatment started. Now it makes sense that my oncologist who wrote the prescription says before and long after the last day of radiation, the diet applies. Does it?
Hopefully, I will be off Orgovyx after 8 or 12 months. Would it be better to wait until then before eating whatever and everything I want. I suggest the more replies we get, the better informed we'll be in this regard.

From CaliforniaProtons

Foods to Avoid During Proton Radiation for Prostate Cancer
Key foods and ingredients to limit or avoid:
• High-fiber foods: Whole grains, nuts, seeds, and raw vegetables can worsen diarrhea and gas, which are common side effects during radiation.
• Fatty and fried foods: Fried foods, fast food, processed meats (sausages, bacon, hot dogs, salami), and high-fat dairy (ice cream, whole milk, cream) may increase digestive upset and inflammation.
• Spicy foods: These can irritate the digestive tract, especially if you already have gastrointestinal symptoms.
• Highly processed foods and sugars: Minimize refined sugars, pastries, and foods with hydrogenated oils, as they can increase inflammation and are generally less nutritious.
• Gas-producing foods: Beans, cruciferous vegetables (broccoli, cabbage), and excess simple carbohydrates can cause gas and bloating, which may interfere with treatment accuracy.
• Caffeinated drinks: These can worsen dehydration and digestive symptoms.
• Unpasteurized or raw foods: To reduce infection risk, avoid raw fish, unpasteurized cheeses, and undercooked eggs.
• Excess alcohol and salt: Both can worsen side effects and overall health during treatment.

if you remove everything you listed what is left to eat?
Zzotte

Your treatment center should have guidelines. I treated at UFHPTI in Jacksonville, FL a year ago. As I recall, I stayed away from sugars, salads. fruits, etc. I stayed away from spicy foods. I would take Culturelle(R) every day, sometimes twice a day to eliminate gut issues that might lead to gas or worse. I made sure to have some anti-gas pills like Di-Gel handy. I recall one requirement was to have a bowel movement every day. They didn't seem to care when, just daily. The diet recommended by UFHPTI can be downloaded here: https://drive.google.com/file/d/1p9hS9wzL6QlW3kZ4LDCPRlFWdi0D67x2/view?usp=sharing

@lifutang Did your SpaceOAR placement proceed on schedule (on May 23)? You asked in particular advise about which foods and fruits are gas-producing and should be avoided"during treatment." You received helpful responses for "during treatment." Tangentially, there were also comments about foods to avoid before/after treatment.
I noted that there were some in our group who were not advised on foods to avoid before and after radiation, or even during treatment.
I was advised March 26th (start of my ADT-Orgovyx) on what to avoid prior to my first treatment on April 9. You were injected Eligard on March 18, and not told "about foods to avoid issues" until the end of April, at which time you received a guidance about foods to avoid. Therefore you'll be on diet for about 5 weeks prior to your treatment beginning in early June, longer than my 2-week pre-radiation diet restriction.
I would like to address the post-treatment diet restriction. @daveinflorida was on track to finish his 28-dose radiation as of mid-May and was hopeful that maybe by then he could be back to a normal diet. I look forward to hearing Dave's update, as I would want to compare notes with him.
My wife and I went on a cruise on week 4 after my last SBRT. I mostly observed my diet restriction as advised by my pharmacist and oncologist, but by the second to the last day of the cruise, I started tasting a bit of the foods that I avoided until then (though scraping the outside of the meat for example, to remove some of the spices but inside still tasted spicy). I am continuing my "experimentation" a little at a time at home, but I am not yet at my full pre-treatment diet (still no fried foods, caffeinated drinks, salads/uncooked veggies). I'm encouraged by @jeffmarc 's experience of never "before-during-after" salvage radiation was he advised to avoid certain foods [though he had cut back on some that he believed aren't good for him (unrelated to ADT)], and @heavyphil 's assurance that "dietary restrictions are ONLY for radiation. Once completed, you can eat anything you like!" Echoed by @northoftheborder .
Ultimately, we each individually will how much liberty we'ill exercise in what we eat post-radiation/while still on ADT; our individual tolerances vary person-to-person. The closest material I found so far regarding "after SBRT treatment" is shown below, with the caveat that "AI responses may include mistakes." But this is not yet a concern for you until probably mid-July when your 28-fraction treatment ends. I wish you the best! - Vir

Hey vircet, If you look at those recs. They include precautions for foods eaten for oral/throat cancer as well.
As with most AI responses, these are all snippets culled from thousands of sources and condensed into a simple universal format that can pertain to any type of cancer radiation.
You can certainly go back to your usual diet after SBRT - IF you are asymptomatic for diarrhea, gas, etc. If not it would be wise to follow a bland diet until your symptoms subside, as you would with any GI disturbance.
I clearly remember my PA at Sloan telling me after my last session that I could go back to my regular diet but ‘don’t go out tonight and eat a whole pizza’! …So I only ate half😁

@lifutang Did your SpaceOAR placement proceed on schedule (on May 23)? You asked in particular advise about which foods and fruits are gas-producing and should be avoided"during treatment." You received helpful responses for "during treatment." Tangentially, there were also comments about foods to avoid before/after treatment.
I noted that there were some in our group who were not advised on foods to avoid before and after radiation, or even during treatment.
I was advised March 26th (start of my ADT-Orgovyx) on what to avoid prior to my first treatment on April 9. You were injected Eligard on March 18, and not told "about foods to avoid issues" until the end of April, at which time you received a guidance about foods to avoid. Therefore you'll be on diet for about 5 weeks prior to your treatment beginning in early June, longer than my 2-week pre-radiation diet restriction.
I would like to address the post-treatment diet restriction. @daveinflorida was on track to finish his 28-dose radiation as of mid-May and was hopeful that maybe by then he could be back to a normal diet. I look forward to hearing Dave's update, as I would want to compare notes with him.
My wife and I went on a cruise on week 4 after my last SBRT. I mostly observed my diet restriction as advised by my pharmacist and oncologist, but by the second to the last day of the cruise, I started tasting a bit of the foods that I avoided until then (though scraping the outside of the meat for example, to remove some of the spices but inside still tasted spicy). I am continuing my "experimentation" a little at a time at home, but I am not yet at my full pre-treatment diet (still no fried foods, caffeinated drinks, salads/uncooked veggies). I'm encouraged by @jeffmarc 's experience of never "before-during-after" salvage radiation was he advised to avoid certain foods [though he had cut back on some that he believed aren't good for him (unrelated to ADT)], and @heavyphil 's assurance that "dietary restrictions are ONLY for radiation. Once completed, you can eat anything you like!" Echoed by @northoftheborder .
Ultimately, we each individually will how much liberty we'ill exercise in what we eat post-radiation/while still on ADT; our individual tolerances vary person-to-person. The closest material I found so far regarding "after SBRT treatment" is shown below, with the caveat that "AI responses may include mistakes." But this is not yet a concern for you until probably mid-July when your 28-fraction treatment ends. I wish you the best! - Vir