Episodes of diarrhoea can be short and transient or they can go on for a considerable period of time. There could have been a sudden onset after an overseas holiday or it may have just been getting gradually worse. I see many clients with persistent diarrhoea and the treatment plan is never the same. Each client may have a different trigger(s) for the diarrhoea. Some of the causes of diarrhoea include:


  • Alcohol abuse. Alcohol is damaging to the gut lining and can encourage diarrhoea. If you are drinking every night and getting diarrhoea every morning there is an obvious fix.
  • Food allergies and intolerances. If you consume foods that you react to it causes an inflammatory response in the gut, which may lead to diarrhoea.
  • Inflammatory Bowel Disease such as Crohn’s Disease or ulcerative colitis.
  • Bacterial infections. These can involve common bacteria such as e.coli, Salmonella etc., but they can also involve some not so common types as well. The testing I do for pathogenic bacteria is very comprehensive (a comprehensive digestive food analysis), and is much more likely to find the culprit.
  • Dysbiosis. Diarrhoea can also be caused by dysfunction in the bacteria that is housed in our own gut. This is known as dysbiosis. When I work with my gut clients I always have the gut bacteria at the forefront of my treatments and investigations. If they are not doing well, there is a good chance that you aren’t either!
  • Parasites. Common gut parasites such as Giardia, Entamoeba, Ascaris etc can be big drivers of diarrhoea. The Comprehensive Stool Analysis (x 3 = 3 different samples) tests for a big range of parasites and because you are testing over 3 different stools the chance of catching the little blighter is 80% compared to 30% in tests using one stool.
  • Laxative abuse. A common habit in eating disorders.
  • Medications. There are very few medically prescribed medications that do not have gut upset on their list of side effects. One of a few of your medications may be causing the problem.
  • Hyperthyroidism. An overactive thyroid speeds up everything in the body including gut transit time which can lead to diarrhoea.
  • Running. Runner’s gut is real and can be a major cause of persistent diarrhoea.
  • Cancers. Including cancer of the stomach or bowel.
  • Radiation therapy. Diarrhoea is an unfortunate side effect.


Diarrhoea can be very uncomfortable but it can also become life threatening. Persistent runny stools can lead to dehydration from a loss of essential electrolytes, malnutrition and weight loss, and if there is blood in your stool you should definitely seek medical help.

There are lots of ways we can help to eradicate diarrhoea. In the first instance there a few diets that may provide instant relief. Taking common gut irritants like gluten and dairy out of the diet can often solve the problem (you may not have reacted to them before gut inflammation can cause you to react to foods that were ok before). The FODMAPs exclusion diet can also provide instant relief. Some other gut irritants such as sulphites, oxalates, histamines, phytates, lectins could also be common culprits. We would make the decision which way to go based on the information you provide during your consultation.

If a more prolonged investigation is required, I would recommend food allergy and intolerance testing. If all of the signs were there I would suggest a trip to your GP for coeliac testing and a check for the more common pathogenic bacteria and parasites. We could also go straight to a comprehensive stool analysis with parasitology and or microbiome mapping.

Diarrhoea can be uncomfortable, embarrassing and can seriously affect your quality of life. There are many ways we can help you get to the bottom of your diarrhoea and make it go away.


Fiona is one of my all time favourite people. After high school, I weighed in at 99kg. At 174cm, I have been overweight by 15-20 kgs for all my adult life. Until, at age 53, I met Fiona. She immediately diagnosed my primary problem and by following her dietary coaching, I lost 16 kgs in 5 months. More importantly, I have maintained this for more than a year now. Now, well into the second half of my life, life is good, very good. As I said, Fiona will always be one of my all time favourite people. Thank you Fiona.

Fiona ran a course at work and it was fantastic – I learned so much and she tailored the programs to each individual which worked really well. I reached my weight loss and health goals and it really wasn’t too hard and I still have treats!  More importantly, I feel much better in myself for making food changes and continued to see her independently when the course at work finished.
Charlotte Carlish
Indigestion, stomach pain and abdominal cramps, were an every day occurrence for me. I was quite desperate by the time I found Fiona. With the help of some supplements and allergy testing, Fiona Took me on a journey of discovery. Thanks to her professional and kind guidance, I now  know which foods to avoid and which ones will help my gut to stay healthy.  For the very first time in a long time, my tummy now feels quite normal and I no longer suffer any of the above conditions. To say Fiona has change my life may sound rather dramatic but it is completely true and I will be forever grateful to her.

Feeling Great, Losing Weight!

I have been working with Fiona at Physical Nutrition for about 10 weeks through a corporate program run my employer.  Losing weight and making some real changes to my dietary lifestyle has been a game changer for me.  Through her weekly tutorials, Fiona has taught me about the food I eat, what is best for my body and to gauge how I feel after each meal.  Combined with a sensible exercise routine of walking and cycling, I have managed to drop my weight by 7kgs during this period.  My energy levels are up, I’m feeling fitter and I’m eating much more balanced meals and now know which foods to avoid and which to eat more of!  It’s been a great experience and I would highly recommend Fiona’s program.

I have recently completed the Physical Nutrition 10kg in 20 weeks program and I couldn’t be more thrilled with the support and guidance Fiona has provided.
The 10 in 20 program not only helped me change my habits by giving me a coach that kept me accountable but also helped to educate me to make better nutrition choices in the future.
Thank you again Fiona & this is just the beginning, I’m not going anywhere ☺️
Paris Doran
Fiona has been working with the City of South Perth over the last year.  She has developed a customised 10 week health coaching and nutrition program with us which the City now offers as part of its suite of health and wellbeing benefits.  All of the participants were overwhelmingly positive about the program.  They rated the program highly on the aspects of Fiona’s professionalism, approachability and knowledge, as well as the results they had achieved.
I would recommend Physical Nutrition to any organisation looking to develop staff benefits.
Gillean Sharp
Physical Nutrition/Fiona Murray has really helped my husband and I to achieve our weight loss and lifestyle goals. Her advice, support and knowledge during the 20 week challenge has set us up to lead a healthier and balanced life style. We thought we had enough food and exercise knowledge before meeting Fiona but she has kept us on track, motivated us and through her group classes has kept us entertained and true to our goals! Thanks Fiona!
Alison Thair
My son is 21 and has been ill for years and part of it was Diet, and we have been to many nutritionalist’s but FIONA MAKES SENSE and TELLS YOU WHY you should be careful what you eat. She changed my sons life so I sent my Daughter who had auto immune issues and she has helped her. It is now my turn so I will keep you updated. Highly recommend her she is also very understanding.
Lisa Mann
I have been with Fiona at Physical Nutrition for several months in relation to skin and gut problems and for weight loss. Fiona is knowledgeable and supportive. I am slowly losing weight and my skin and gut issues are improving. Fiona works in conjunction with my integrative medical practitioner which is a very helpful. First time I have had any positive results, a slow but worthwhile approach.
Lynne Besant


If you have any questions or issues you’d like to discuss, please don’t hesitate to contact us.