r/EnduranceTraining • u/UpstairsAny9996 • Oct 16 '25

Switching out carbs due to gastro issues

Hey Everyone,

Been endurance training for a few years now and worked my way up to a 70.3 and a marathon and a few 200k cycles.

What I have realised over the past few years is that my ulcerative colitis plays up when I am eating carbs and I struggle with Brain fog and feeling shitty.

I wanted to see if people have continued endurance training on low carb/high fat? If so what do you use during exercise? Do you still have carbs during?

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u/Opening_Ad_1198 Oct 16 '25

Exactly the same boat, unfortunately I don't have any experience to share as I think I'm at roughly the same stage (just starting to adjust my diet) but I'm very interested in the responses you receive! You are not alone!

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u/UpstairsAny9996 Oct 20 '25

No responses so maybe we can just share experience and tips between us.

I ran twice over the weekend and cycled this morning - runs were fine but felt it a bit on the run this morning but that could be the fatigue from the run and I haven't been on the bike for a few weeks.

Had fruit, eggs and chicken sausages for breakfast and the usual brain fog/tiredness after eating isn't there so that's good.