Just a quick data point … I had planned a 24-hour fast (not a big deal - skip meals between the last dinner and the next). In a moment of weakness last night I downed a bit of chips. Processed carbs - not the best choice. Not the worst, but … ok, fine - probably the worst.
At any rate, at about the 18-hour mark, though I had not yet felt hunger or anything else, my eyesight started going wonky.
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