What does a bonk feel like?

Bonked many times over the years but the worst resulted in loss of colour vision (which I only noticed when it returned), loss of feeling in face and lips, confusion and irrational thoughts. That particular episode was brought about by not preparing my nutrition properly for 100 mile MTB race (Kielder 100) and assuming I would be ok with the event provided feed stations. This was a very very bad idea. 68 miles in and I was in a whole world of hurt. Fortunately I made it to a big feed station and just sat there eating non stop for about 90 minutes. Did not finish that race but it was a big lesson learned.

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