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Something that gets in your bloodstream faster might make it feel better?
Digesting oats for the full workout has got to pull lots of resources/blood away from your legs and lungs?
Of course grand tour riders eat on the bike, but tend to go for gels when the effort ramps up.
Large Coffee with about 25-30g sugar/carbs about 5:40 for a 6am turbo works ok for me, followed by porridge or ham, eggs, toast.
I can only do mornings now and probably going forward. Means a 0530 wake-up, porridge and caffeine straightaway for a 0615 start. The warm up is horrible every time but actually got used to the sessions now it's a routine.