What is the proper diet and regimen the day of high-dose radiation?

Define "high dose radiation " please.

@big17781
I assume by high dose radiation you are talking about the high dose 5 day (usual) high dose radiation treatment instead of the low dose long term plan of 20-30 days of radiation treatments or even more.

Your medical provider should have given you dietary guidance on what to eat and not eat. I know one thing to avoid is beans and soy. They cause gas in colon which can move your colon around. I pass this on to you as was given a list of foods to avoid and one was soy. I was doing a protein drink one day and did not think anything of it.

When I got to UFHPTI and laid on table (use a low dose xray to line you up) they came in and said see gas in colon and have moved your prostate so far away from program we need to adjust the bed. They asked what I had ate or drank as causing it. I did not know. But when I got home I looked at the protein powder and saw Soy. And my techs said yep that will cause it.

So asked your medical providers what you should eat not eat, drink not drink, as they have your medical history and aware of any other medical concerns. Wish I could help more but my diet restrictions were specifically designed for me.

@jc76 THANKS!

I was given this by my cancer center:

Follow these guidelines to lower your risk of bloating during radiation therapy. It’s best to start 2 to 3 days before your simulation and keep following them until you finish radiation therapy.

Eat slowly and chew your food well. This will help you avoid swallowing air.

Avoid using drinking straws and drinking directly from bottles and cans. This will also help you avoid swallowing air.

Limit or avoid foods that release gas when they’re digested, such as:
Asparagus
Beer
Broccoli
Brussels sprouts
Cabbage
Cauliflower
Corn
Dried beans, peas, and other legumes
Garlic
Leeks
Milk and other dairy products with lactose, if you’re lactose-intolerant
Onions
Prunes
Avoid carbonated (fizzy) drinks, such as sodas and sparkling waters.
Limit or avoid sugar alcohols, such as xylitol, sorbitol, and mannitol. Sugar-free foods often have sugar alcohols. Check the ingredients list on the food’s Nutrition Facts label if you’re not sure.
Choose cooked vegetables instead of raw vegetables.
Your healthcare provider may tell you to eat more or less fiber, depending on your symptoms. Follow their instructions.

I generally drank a protein shake first thing in the morning (6-6:30) and 25 oz. of water. 2-3 hours later another 25 as the first one gets absorbed into your system. My apt. was at noon so would evacuate and then reload with 28 oz 30 minutes before my appointment. I always tried to have a bowel movement to ensure my rectum was clear. Carried a small enema with me just in case, I had to get off the table twice and use it. Glad I had it with me. RO didn't like the idea and I told him I didn't care and was giving him information. If you have a prostate get the gel. I also recommend getting Oxybutynin for bladder stadiums before you start. Apparently you are doing HBRT 5(?) sessions? I did 25 sessions of EBRT so your sides might not show up until after you are done at the center but you will have it if you need it.

I recently received the 5X SBRT treatment and was asked to treat myself to an enema each morning prior to treatment. Quite honestly, those were the most uncomfortable part so I chose fasting to lessen the outcome. Empty bowel and full bladder was my goal and this worked well for me. Best of luck with your treatment - and peace to all.

My treatments were at 9am. Eating was difficult at the start, and became nearly impossible later. I eventually found it best to have a plain chicken sandwich within an hour after treatment, and that was food for the day. Working with food lists from my cancer center proved difficult with inconsistent results. The regular timing and same food allowed me to focus on getting my body ready for the next session. Fridays and Saturdays were the time to break the food monotony; Sunday it was back to the routine to prepare for Monday.

I had the same advice from my radiologist as @billkmed for 5 times SBRT treatment. Enema an hour before my appointment and drink 3 big glasses of water to fill my bladder. My instructions did not have any dietary advice so they must figure that the enema would empty my bowel sufficiently.

@bigl7781, did your cancer center also give you instructions of how to prep for radiation? How is treatment going? How are you feeling?