Several times a day. I do the bulk cook-and-freeze-then-reheat method. Microwaving food has both positives and negatives, just like conventional cooking vs. eating things raw. I haven't found any convincing evidence that microwaving is better or worse overall compared to other forms of heating and cooking.

Wikipedia lists some good studies that show both positive and negative effects of microwaving. http://en.wikipedia.org/wiki/Microwave_oven#Effects_on_food_and_nutrients

Never microwave anything in plastic. Including wrappers. In fact, if your food comes in "wrappers," stop that. (I'm referring to seriously "packaged" food, not literally everything wrapped.)

"Re-heat" is an odd term. In general you don't want to be cooking and re-cooking your food. Cook once, consume. If you're large quantities and reheating portions sequentially, I'll just say that's not my approach.

Oh, and for what it's worth. I don't recommend standing next to an active microwave. Something like common sense, it would seem.

never, ever use it. We had one years ago, got rid of it and have not missed it at all.

Never and never - microwaved food just does not taste right to me.

Don't use a microwave at all, don't miss it in the kitchen. Our kitchen is too small for one anyway. Most meals are cooked fresh and leftovers are reheated on the stovetop or baked in the oven.

I'm with Paul Jaminet: "microwave warming is a central part of [my] lifestyle." Science FTW!

Microwaved bacon is legit.

I never cook food in a microwave. I do use it for reheating meals 2-3 nights a week. And I always use glass containers.

I probably use my microwave three times a week - twice to reheat food (usually not for me) and once to thaw some meat for the dog or I in a hurry.

I keep thinking I'll get rid of it, but I have such a crummy stove/oven - it's horribly inefficient to reheat food that way. One of these days I'll get a countertop convection oven...

I make big batches of meals and reheat them in the microwave; I'm in college so that works best with my schedule. Usually I use it 1-2 times a day. I also cook sweet potatoes in the microwave and steam broccoli in a glass container. I never microwave in plastic containers, only glass and ceramic.

Don't own one, don't use one.

I cannot bring myself to ever use a microwave oven. From what I have read, it does some kind of damage to the food or water that it treats. Unhealthy methinks.

Oy, are folks still freaking out about microwaved food being "hazardous"?

I cook on the stovetop or oven 3-4 times per week, the rest of the time I'm simply rewarming in the microwave.

The only thing I cook in a microwave are those steam-in-bag veggies. I reheat stuff often. Everything from coffee to leftovers.

Water still boils at 100 degrees C in a microwave. That's what cooks your food. I've yet to see any evidence of microwaves altering food in any sort of meaningful way, though I remain open to the possibility (show me the money!).

I hardly ever use it to warm or cook foods but it makes a super safe place to thaw meats with 4 dogs in the house!

I mostly just use my microwave for the timer (while I cook on the stove).

I used a microwave for the first time in probably 5 years last night.

It's very very rare for me use the MW. That's not a conscience decision to avoid it, it just turned out I didn't need it after going paleo. My MW has become a giant boxy clock that takes up a lot of space.

I never had one and I'll never have a microwave.

I am trying to use mine less and less. I'm just not convinced it's all that good for you. Also, food reheated in the microwave doesn't stay warm for as long as when it's reheated on the stove. I'm not making that up, I read the science about it somewhere.

Less than once a week, if I am in a real hurry. I prefer to rehead food in the oven or a pan.

If there are leftovers to eat, I definitely reheat in the microwave. I think it is a superior way to warm leftovers. I also occasionally cook sweat potatoes and other tubers in the microwave.

I don't like old food in general, so I usually cook my food right before I eat it. My microwave, however, still gets extensively used as I bake potatoes in it. Every. Every. Day. I really don't notice a taste difference between microwaved and oven-baked potatoes, and I like to have my potatoes within ten minutes time as opposed to one or more hours. I've noticed almost as a rule that microwaved red meat is nasty. I'll occasionally do salmon and chicken in it though, because I'm either too hungry to wait for oven baked food or it's too hot to turn on the oven.

Once in a while I have to heat water when I'm at work so I can have some tea. I'm toying with the idea of bringing in an electric tea kettle, but I may be hard pressed to have anywhere to plug it in. Sad!

Got rid of the microwave about a year ago. I don't miss it. You just have to plan ahead for thawing meat and other items. Everything else I use the oven. Just a simple change in lifestyle, if I'm in a hurry, I eat it cold.

Never. I gave away to a friend of mine before paleo in exchange for a large freezer.

i use a microwave at work to boil distilled water for tea...my coworkers pollute the kettle with tap water :(

I boil coffee water in the morning, one o them little single-cup drip funnels. Then sometimes I give the slow-cooker a head start by boiling the water. Other than that, I rarely use it anymore. If I decide to reintroduce rice to my diet (I got tons in the pantry), I'll use the microwave a lot then. But that's still just basically boiling water, isn't it? Microwaves are good for that, at least.

Once per day, I heat a little water so I can dissolve rapadura sugar for making water kefir.

Once per week, I heat white sugar and water to make syrup for hummingbird feeders.