I know what you're talking about with the leg pain. I was surprised to see no one mentioned it could very well be (and most likely is) a side effect of dehydration (potassium loss). Those leg pains and cramps can get unbearable. Next time you fast drink lots and lots of water. Or you can use the Sea Salt approach, there is a website the watercure.com that has all that info on it. As well how much water to drink each day according to your weight. Drinking enough water when fasting or dieting makes a HUGE difference! Ive seen it with myself first hand. Because dehydration can have such nasty side effects (horrible headaches, muscle aches, spasms, irritable, heartburn etc) it can certainly derail a fast plan.