Couple of weeks back, I went through a very bad cramping phase over 4 days, totally unlike I have ever had before, usually I only cramp on the right leg but this was both legs and I did not have an immediate answer as I always take plenty of drink wih electrolyte added to the bottles and also in my preride drink. Even short rides I suffered, I only had to stop or ease off pedalling and that was it, severe cramps
The answer when it came hit me in the face like a wet fish tail and I should have twigged sooner and lesson well learnt.
On my rest day, first thing in the morning, I went to toilet for a number 2, one of many that I was having at that time in succession, and rather than waste time looking at the door I took a book on training with me (cycle trainining, not potty training) and usually I start reading from the page it opens on, which by a very strange coincidence opened up on a page about dehydration and cramps, and then it hit me what was wrong, I had a bad dose of the galloping foxtrots for that whole period but only in a morning, where I was having to go for about 3 or 4 no 2's within about an hour. Despite drinking plenty over that period as normal, I never accounted for loosing fluids through a good solid number 2. If I had a proper, through the eye of a needle stuff like after a good night down town, then I would have twigged, but not when it was normal solid poo.
That day I drunk loads of water and the next day on my ride, never suffered a bit of cramp.