Bowel Cancer Awareness: How Nutrition Can Help Reduce Your Risk
June is Bowel Cancer Awareness Month, a timely reminder to talk about one of Australia’s most common cancers — and the everyday steps we can take to support bowel health.
While not all cases of bowel cancer are preventable, research shows that diet and lifestyle can influence risk. As dietitians, we often talk with clients about gut health, fibre, bowel habits, weight management and long-term disease prevention. When it comes to bowel cancer, these conversations matter.
This blog explains how nutrition may impact bowel cancer risk and the practical changes you can make to support your health.
What is bowel cancer?
Bowel cancer, also known as colorectal cancer, can affect the colon or rectum. It often starts from small growths called polyps, which can sometimes develop into cancer over time.
Bowel cancer can affect both men and women, and although risk increases with age, younger adults can also be diagnosed. This is why awareness, screening and paying attention to symptoms are so important.
Common symptoms may include:
Blood in the stool or rectal bleeding
A persistent change in bowel habits, such as diarrhoea, constipation or narrower stools
Unexplained weight loss
Ongoing abdominal pain, bloating or cramping
Unexplained fatigue or low iron levels
If you notice any of these symptoms, it is important to speak with your GP. Do not assume symptoms are “just diet”, “just IBS” or “just haemorrhoids” without medical review.
Can nutrition reduce bowel cancer risk?
Nutrition is not a guarantee against bowel cancer, but it can play a meaningful role in lowering risk and supporting overall bowel health.
The strongest nutrition-related areas to focus on include:
Eating enough dietary fibre
Choosing mostly wholegrains
Eating plenty of vegetables, fruit and legumes
Limiting processed meat
Keeping red meat intake moderate
Limiting alcohol
Supporting a healthy body weight
Staying physically active
Small daily changes can add up over time.
1. Eat more fibre for bowel health
Fibre is one of the most important nutrients for bowel health. It helps keep bowel motions regular, supports a healthy gut microbiome and may reduce bowel cancer risk.
Many Australians do not eat enough fibre each day. A good place to start is by adding more plant-based foods across your meals and snacks.
High-fibre foods include:
Wholegrain bread, wraps and cereals
Oats, barley, brown rice and wholemeal pasta
Lentils, chickpeas, kidney beans and baked beans
Vegetables, especially with the skin left on where appropriate
Fruit such as apples, pears, berries and oranges
Nuts and seeds
A simple goal is to include a fibre-rich food at each meal.
For example:
Breakfast: oats with berries and chia seeds
Lunch: wholegrain wrap with salad and lean protein
Dinner: stir-fry with vegetables, brown rice and tofu, chicken or fish
Snack: fruit, yoghurt, nuts or wholegrain crackers
If you currently eat a low-fibre diet, increase fibre gradually and drink enough fluid to help avoid bloating or constipation.
2. Choose wholegrains more often
Wholegrains contain fibre, vitamins, minerals and protective plant compounds. They are also more filling than refined grains and can support better blood glucose and cholesterol management.
Easy wholegrain swaps include:
White bread → wholegrain or high-fibre bread
White rice → brown rice, quinoa or barley
Regular pasta → wholemeal or pulse-based pasta
Low-fibre cereal → oats, Weet-Bix, bran-based cereal or muesli
You do not need to be perfect. Even swapping one or two grain choices per day can make a difference.
3. Limit processed meat
Processed meats are meats that have been preserved by smoking, curing, salting or adding preservatives.
Examples include:
Bacon
Ham
Salami
Prosciutto
Some sausages
Hot dogs
Deli meats
Regular intake of processed meat is linked with a higher risk of bowel cancer. From a dietitian perspective, this does not mean you need to panic about the occasional slice of ham or bacon at a café breakfast. However, it is worth reducing how often processed meats appear in your usual weekly routine.
Try swapping processed meat for:
Chicken, turkey or tuna
Eggs
Hummus
Cheese and salad
Leftover roast meat
Tofu or tempeh
Legume-based fillings
For lunchboxes, this might look like a chicken and salad wrap instead of a ham sandwich, or egg and avocado on wholegrain toast instead of bacon.
4. Keep red meat intake moderate
Red meat, such as beef, lamb and pork, can provide important nutrients including iron, zinc and protein. However, eating large amounts of red meat regularly may increase bowel cancer risk.
A practical approach is to keep red meat moderate and vary your protein choices across the week.
Include a mix of:
Fish and seafood
Chicken or turkey
Eggs
Legumes and beans
Tofu or tempeh
Nuts and seeds
Lean red meat in moderate portions
You might also try a few meat-free meals each week, such as lentil bolognese, chickpea curry, bean tacos or tofu stir-fry.
5. Eat more vegetables, legumes and fruit
Vegetables, legumes and fruit provide fibre, antioxidants, vitamins and minerals that support long-term health.
A simple guide is to aim for:
5 serves of vegetables per day
2 serves of fruit per day
Legumes several times per week
One serve of vegetables is about ½ cup cooked vegetables or 1 cup salad. One serve of fruit is about one medium piece of fruit or two smaller pieces.
Ways to increase your intake include:
Add spinach, tomato or mushrooms to eggs
Include salad on sandwiches and wraps
Add frozen vegetables to pasta, curries and stir-fries
Snack on fruit with yoghurt or nuts
Add lentils or beans to mince dishes, soups and casseroles
You do not need fancy “superfoods”. Consistency with everyday whole foods matters most.
6. Limit alcohol
Alcohol is linked with an increased risk of several cancers, including bowel cancer. Reducing alcohol intake is one of the most practical steps you can take to support long-term health.
Helpful strategies include:
Include alcohol-free days each week
Alternate alcoholic drinks with water or sparkling water
Choose smaller serving sizes
Avoid using alcohol as your main stress-management strategy
Keep alcohol out of the house during the week if it is hard to limit
If you drink regularly and want to cut back, start with a realistic goal and build from there.
7. Support a healthy body weight without extreme dieting
Excess body fat is linked with increased bowel cancer risk. However, this does not mean you need to follow a restrictive diet or chase rapid weight loss.
A dietitian can help you focus on sustainable habits, such as:
Eating regular balanced meals
Increasing fibre and protein for fullness
Reducing large portions of energy-dense snack foods
Planning meals to reduce takeaway reliance
Improving sleep and routine
Building physical activity gradually
The goal is not perfection. The goal is a realistic pattern of eating that you can maintain.
8. Look after your gut symptoms
Many people live with bloating, constipation, diarrhoea or irregular bowel habits for years before seeking help. Sometimes these symptoms are related to IBS, food intolerances, low fibre intake, stress, medications or other gut conditions.
However, ongoing or changing bowel symptoms should always be discussed with your GP, especially if there is blood in the stool, unexplained weight loss, anaemia, night-time symptoms or a family history of bowel cancer.
Once serious causes have been ruled out, a dietitian can help you manage symptoms while still keeping your diet balanced and nutritionally adequate.
Don’t forget screening
Nutrition is important, but screening saves lives.
In Australia, eligible people aged 45–74 can complete a free bowel cancer screening test every two years. People aged 50–74 are generally sent a kit automatically, while people aged 45–49 can request their first free kit.
If you have symptoms, a family history of bowel cancer or a personal history of bowel polyps or inflammatory bowel disease, speak with your GP about the most appropriate screening and testing for you.
A dietitian’s practical bowel health checklist
To support bowel health and reduce bowel cancer risk, start with these steps:
Choose wholegrain breads, cereals, rice and pasta more often
Aim for vegetables at lunch and dinner
Include fruit daily
Add legumes such as lentils, chickpeas or beans several times per week
Reduce processed meats such as bacon, ham and salami
Keep red meat portions moderate
Drink enough water, especially when increasing fibre
Limit alcohol
Move your body regularly
Complete bowel cancer screening when eligible
Speak to your GP about any bowel changes or concerning symptoms
Need help improving your diet for bowel health?
At Health Management Dietitians, we help people make practical nutrition changes that support gut health, bowel regularity, weight management and long-term disease prevention.
Whether you are increasing fibre, managing IBS-type symptoms, reducing cancer risk factors, or wanting a more balanced eating routine, our Accredited Practising Dietitians can help you create a plan that suits your lifestyle.
Book an appointment with Health Management Dietitians today to take a proactive step towards better bowel health.
Important: This article provides general nutrition information only and should not replace personalised medical advice. If you have bowel symptoms, blood in your stool, unexplained weight loss, persistent abdominal pain, low iron or a family history of bowel cancer, please speak with your GP.
We understand that nutrition isn’t one-size-fits-all. Our Cairns, Atherton and Mareeba dietitians provide personalised, practical nutrition advice to help you reach your goals while still enjoying food.