1) I don't. Personally, I don't handle fasting well. With my work schedule mixed with CrossFit, I need to eat.

2) I don't think so, as long as your metabolism is repaired from eating SAD. I think (ahem) that with a damaged metabolism used to SAD, it's important to go through a repairing process by eating paleo. After which, I think fasting can provide some benfits, but before, I'm not so sure.

3) That's probably made up of waste and water. It will most likely come back.

I don't keep a schedule. I do it when it comes naturally, that is, when I don't feel like eating a meal or two. I don't notice any difference in my metabolism. In fact, I often feel quite good and alert during IF. As for weight lost, when I first started paleo, it would take the weight off. I'm now approaching my equilibrium weight, so it doesn't shave off noticeable pounds.

What, exactly, is intermittent fasting? Is it skipping one meal? Two? A day? Is there a minimum/maximum? If you don't eat breakfast before you CrossFit, does that count as fasted training if you ate dinner the night before? I tend to get dizzy and rather cranky with lack of food. I don't mean pre-crossfit, but if I didn't eat after, or if I fasted for 24 hours or something. I'm not sure it's a great idea to try and CrossFit on an empty stomach... I have often done 24 hour fasts (religious fun!).

I don't really fast, unless you count a late breakfast. 24 hours? Might kill me. Going without fat and protein for very long makes me feel like utter crap (often triggers a migraine). Plus, I need to gain weight, and I can get in the most calories if I eat 2-4 large meals per day.

my fasting is usually up to 18 hours only and I do it naturally after a afternoon snack to breakfast the next day. I do this regularly but if I can't I don't worry about it.

I feel good doing it this way, it works for me without effort or thought. I don't actually do it for weight loss, I like feeling lighter and helps my poor digestion.

I notice more loss when I've eaten more calories (good ones), I may go up or down a few pounds but generally I don't really worry about it. I'm at my goal weight.

I typically do a 24 hour fast once or twice a month, BUT I do mini fast almost daily just by skipping breakfast and eating a late lunch. I do regular 15 to 18 hour fast weekly sometimes multiple times a week.

You're metabolism will not slow down, it doesn't until after 36 hours I believe. It is not counterproductive.

Weight fluctuates yes, so stop using a scale and start looking in the mirror. Make sure you drink lots of water while you fast. Some days I weigh 167 and other times I am up to 180, but when I look in the mirror I am getting leaner.

Are you working out too. Muscle weighs more...

1) I usually fast a couple times a month. I will usually fast when it comes naturally, either I'm too busy at work to eat or not somewhere with decent food. Occasionally, I will use it as a "reset" after a particularly off period. I have to be careful with this one to make sure that I'm not falling into a restriction pattern to "punish" myself though.

2) During all of my weight loss I have occasionally fasted, it has always helped, not hurt.

3) If I stayed strictly to my protocol after the fast and didn't use it as an excuse to over indulge when it was over I kept the weight off, every time.

Every night when I go to sleep.

Fasting beyond that seems extremely catabolic and in direct conflict with all of my goals. I simply can't fathom why I would want to do controlled starvation experiments. Insulin sensitivity can be improved extremely well via fructose removal and various types of exercise.

I fast everyday. Since it's rutine I wouldnt call it intermittent fasting although I do IF as well. I have a eating window from 9 am until 2 pm everyday, then I do not eat any more after that. I also add in some 36 hour fasts once or twice a month.