Is exercise causing distress for your gut?

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Beverley Gibbs

Is exercise causing distress for your gut?

Posted by Beverley Gibbs 1141 Days Ago

Digestive Health

We all like to feel the fitness and health benefits that exercise brings, but for some of us there are unwelcome side effects. The digestive system has to put up with a lot of disruption when we exercise (think of all that pounding up and down when running, being bent over when cycling, or swallowing water when swimming). In some cases, this can lead to an uncomfortable condition called gastro-intestinal or GI distress.

Sporty individuals (particularly endurance athletes) commonly experience GI distress, but it is little talked about. It can be embarrassing to admit to bloating, cramping, wind and loose bowel movements, but studies have shown that between 30%-65% of runners will suffer at some point. This means most people are suffering in silence and simply try to put up with it.

What causes GI distress?

It’s believed there are three main causes of GI problems:

·         physiological (caused by reduced blood flow to the gut during exercise)

·         mechanical (bouncing effect of running, for example)

·         nutritional (such as excess ingestion of carbohydrate/sugary drinks).

Other contributors include alcohol consumption, anti-inflammatory medications (commonly taken for sore muscles and joints), emotional stress and nerves before a race, disease-causing bacteria in lakes and rivers and excess pressure on the abdominal wall through all that exertion.

What can you do about it?

Ultimately, these symptoms can impair performance and possibly prevent athletes from winning or even finishing a race. However, many nutritional steps can be taken to support the problem. These include:

Reducing the fibre content of the diet at key points in the training programme to ease the burden on the gut

Adding in probiotics (“friendly” bacteria) and prebiotics such as (foods that these bacteria love), such as garlic, onions and asparagus

Using drinks containing different forms of carbohydrates (gentler on the gut) as fuel - look for those that are a mix of glucose and fructose, not glucose on its own.

Need more help?

If you want to learn how to avoid GI distress, or to help your current symptoms, then I can support you. I specialise in Sports Nutrition and can help you be your best!


de Oliviera E, Burini R (2014), Carbohydrate-Dependent, Exercise-Induced Gastrointestinal Distress, Nutrients, 6:4191-4199.

Simons S, Kennedy R (2004), Gastrointestinal Problems in Runners, Current Sports Medicine Reports, DOI: 10.1249/00149619-200404000-00011.

Casey E, Mistry D, Macknight J (2005), Training Room Management of Medical Conditions: Sports Gastroenterology, Clinics in Sports Medicine, 24:4191-4199.

Jeukendrup A (2010). Carbohydrate and exercise performance: the role of multiple transportable carbohydrates. Current Opinion in Clinical Nutrition and Metabolic Care, 4:452-457.