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MAC1954 said on 04 September 2012

I've had IBS for a number of years and never had any major problems. I exercise regularly, swimming, running and cycling and have done for a number of years. I am competing in a 80 mile cycling sportive in October and have been trying to increase my mileage in preparation, but find that I am 'running out of steam' after about 35 miles - no strength in my legs. I've trained at 50 miles plus per ride in the past without any problems. The only thing I can put it down to is my IBS, that I am not retaining food in my system to 'feed off' on my longer rides. I am eating plenty of food before rides and during. Any advice please?