Nutrition Tips After Bowel Cancer Surgery

Practical, dietitian-led advice on managing bowel changes, hydration, fibre and diet after surgery and when to seek specialist support.

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Nutrition tips after bowel cancer surgery
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How Long Do Side Effects Last? Reducing Side Effects Should You See a Dietitian? What Diets May Be Advised? Healthy Diet & Lifestyle Eating Well on Low Fibre What Else Can Help?
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I may have just missed bowel cancer awareness month, but for people affected by it, knowing what to expect around treatment is important at any time. So here are my support tips if you have had treatment for bowel cancer.

If you have bowel cancer and have had surgery, you may be still struggling with side effects, even a long time after.

In short: After bowel cancer surgery, it typically takes around two weeks for bowel action to settle into a new pattern, but ongoing diarrhoea, urgency or stoma output problems are common. Adjusting fluids, fibre, fat and meal timing — with support from a registered dietitian — can significantly improve symptoms and prevent dehydration or malnutrition.

How Long Will You Have Side Effects From Bowel Surgery?

Everyone is different. Depending on the type of operation, your bowel action will be affected in various ways.

Typically it takes around 2 weeks for your bowel action to get to its new pattern; however, there are some things to look out for after this time.

Your dietitian, doctor, surgeon or specialist nurse can advise and support you if you continue to have problems after treatment. Adaptations to your diet can really make a big difference.

Seek medical help if: you have diarrhoea every hour or so, or are emptying your stoma bag too often, and your urine is getting darker and less — please seek help from your doctor, as you could be getting dehydrated.

Resolving this may not be as simple as just drinking more — for some people, adaptations in the composition of drinks are needed, such as electrolyte drinks, always under the direction of your healthcare professional.

Further hydration information is available from NHS Inform.

What Can Be Done to Reduce These Side Effects?

With careful assessment of your symptoms, taking into consideration the type of surgery, medication, and your diet, a professional can help develop a plan to alleviate or better manage your symptoms.

Should You Seek Advice From a Registered Dietitian?

You may need to speak to a registered dietitian if you are losing weight, are following a restrictive diet, or if you feel that your diet is making your symptoms worse.

You may also be confused about advice found online about the best diet — NHS or freelance dietitians, suitably qualified in cancer rehabilitation and the consequences of cancer treatment, can help you decide on what's right for you, and avoid following wrong advice.

What Type of Diets May Be Advised?

This again depends on the assessment — if you have a stoma for example, or have had your bowel re-joined, the advice may be different. The advice for rectal cancer may differ substantially from the one given for anterior resection.

Some common things a dietitian will consider:

  • The types of fluids you are drinking and when you're having them.
  • The type and timing of fibre and carbohydrates you are eating.
  • Your intake of fat, and if you have any problems with bile acids following your operation.
  • The impact your individual eating habits may have on the health of your friendly gut bacteria.
  • If you need any extra vitamins and minerals — some types of treatment reduce your gut's ability to absorb those, or you may be losing some if you have diarrhoea or high stoma losses.
  • Quantity and timing of your food intake.

Ground Flaxseeds (Linseeds)

Some foods are known to be especially good for bowel health, depending on individual circumstances, for example, ground flaxseeds (linseeds).

Best to start off with a small portion, 1 teaspoon a day, and gradually increase to 1 tablespoon spread out through the day.

It can help keep stools formed, and improve control over bowel action in many cases.

Although often useful, this does not help everyone, and if you have problems with bile and fats, seeds in too high quantities may cause you problems. Speak to a professional if you are unsure.

For those trying them, I have found the best way to take flaxseeds is with a Greek style high protein yoghurt, sprinkled on top and adding soft peeled or stewed fruit or compote for flavour.

This may also help stoma thickening — everyone is different though, so try it in small amounts first and then see how you get on.

Healthy Diet and Lifestyle After Bowel Cancer Treatment

So you have had all of your cancer removed — that's amazing. The other good news is, a healthy diet and lifestyle can greatly improve your chances of staying well.

Other tips if you can:

  • Stop smoking and minimise alcohol.
  • Take regular exercise.
  • Eat a varied, healthy diet which includes different fruits and vegetables, and calcium-containing dairy foods, found to reduce bowel cancer risk.
  • Minimise red meat.
  • Include sustainably sourced oily fish.
  • Don't forget some wholegrains, unless you're unable to have them.
  • Take 10mcg of vitamin D daily.

How to Eat Better If You Have to Have a Low Fibre Diet

Especially if you're also choosing to eat plant-based foods:

  • Remove skins from fruits and vegetables and have them cooked.
  • Start with smaller portions.
  • Chew your foods well and eat slowly.
  • Always make sure you maintain your hydration through the day — we need both fibre and fluid to maintain bowel action and health.
  • Foods like oats, flaxseeds, soft fruits and root vegetables tend to be well tolerated, so start with these.
  • It may help to time certain medications with eating — however this should be discussed with your GP, specialist nurse or suitably trained registered dietitian.

Is There Anything Else You Can Do to Support Your Health After Bowel Cancer Surgery?

Yes, lots.

Keep your mind and body in good shape generally — start exercise to suit your ability.

If you've just had surgery, discuss with your surgical team if it is safe to exercise.

Keep your mind active, and make sure you take time to relax in whatever way you find works best for you.

I like to go for a walk in the woods or along the coast, and pottering in the garden.

For further advice, see these recommended sites:

If you have any more questions, please get in touch via my website or email ginag@therehabdietitian.com. I am a cancer specialist dietitian and personal trainer providing private telehealth consultations within the UK and internationally.

References

  • Foods and beverages and colorectal cancer risk: a systematic review and meta-analysis of cohort studies, an update of the evidence of the WCRF-AICR Continuous Update Project. Vieira AR, Abar L, Chan DSM, Vingeliene S, Polemiti E, Stevens C, Greenwood D, Norat T. Ann Oncol. 2017 Aug 1;28(8):1788-1802.
  • Recent Evidence for Colorectal Cancer Prevention Through Healthy Food, Nutrition, and Physical Activity: Implications for Recommendations. Perera PS, Thompson RL & Wiseman MJ. Curr Nutr Rep. 2012 DOI 10.1007/s13668-011-0006-7
  • Dairy products and colorectal cancer risk: a systematic review and meta-analysis of cohort studies. Aune D, Lau R, Chan DS, Vieira R, Greenwood DC, Kampman E & Norat T. Ann Oncol. 2012 (1); 23: 37-45
  • Meta-analyses of vitamin D intake, 25-hydroxyvitamin D status, vitamin D receptor polymorphisms and colorectal cancer risk. Touvier M, Chan DS, Lau R, Aune D, Vieira R, Greenwood DC, Kampman E, Riboli E, Hercberg S & Norat T. Cancer Epidemiol Biomarkers Prev. 2011; 20: 1003-16.
Gina Giebner
Written & Reviewed by Gina Giebner
HCPC Registered Dietitian · Cancer Specialist & Personal Trainer

Gina combines dietetic expertise with rehabilitation training to support people living with and beyond bowel cancer — from managing stoma output and bowel urgency to rebuilding strength after surgery. She practises as a specialist cancer dietitian, offering private telehealth consultations across the UK and internationally.

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