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How athletes can overcome digestive issues

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Gastrointestinal (GI) complaints are common among athletes, particularly those who compete in endurance sports.

Causes of GI complaints among athletes vary from blood flow and gut permeability to the posture of the athlete or the repetition of high-impact mechanics (such as those suffered by marathon runners). Nutritional causes also have a major role to play.

Likewise, the effects and severity of complaints are highly individualised and range from nausea and belching to more serious symptoms. One thing is clear, however: GI complaints have the potential to, and do have, a negative impact on performance.

Avoiding GI complaints - nutritional interventions


It may seem like common sense, but you must start your race or training well hydrated. If you are not well hydrated, your digestive system will not function properly, and this can aggravate GI symptoms.

Reduce your fibre intake

Fibre plays an important role in keeping you regular, but in the run-up to race day, and indeed during an endurance event, it is advisable to avoid foods that are high in fibre. High fibre intake in the run-up to endurance events can increase bowel movements, which leads to fluid loss, and has been linked to a higher prevalence of GI complaints.

Friendly bacteria

The digestive tract is home to trillions of bacteria, and it is important to maintain a healthy balance of good or 'friendly' bacteria. Probiotics help to repopulate friendly bacteria, which in turn help to aid digestion and nutrient absorption. Probiotic yoghurts are well known for containing probiotic cultures, but they can prove to be expensive. At Team Sky we instead choose to use Healthspan Elite's Pro20 Biotic, which provides 20 billion friendly bacteria per capsule.

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Fruit and vegetables

Everyone knows that achieving five portions of fruit and vegetables a day is important to ensure that you are getting all the nutrients that you need from your diet.

What is less well known is the role that alkaline-forming fruit and vegetables have in reducing acidity in the gut. Blood pH has a slightly alkaline range of 7.35-7.45, and when more alkaline-forming foods are introduced into the diet, urine becomes slightly more alkaline, indicating that less acid needs to be removed from the blood.

Smoothies are a great way to increase your intake of fruit and vegetables. The riders on the Grand Tours will also take Healthspan Elite Performance Greens, which contain an abundance of alkaline-forming ingredients.

Understand what works for you

The last thing you want is to be caught out on race day. During training, experiment with different pre-race meals, supplements and fuelling strategies to find out what works best for you.

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