Is it true that microwaving food takes all of the nutrition away? Is that true? If it is true, does "nutrition" just mean all of the good stuff for you? Does it take away calories or other bad stuff?
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I don't believe it is true at all that microwaving food takes away all of the nutrients. I read in a book called 1001 Health Tips that microwave cooking actually conserves nutrients.

There are a lot of different opinions about microwaving food... Some people believe that microwaving food does so much damage to the food that your body can't even recognize it as food and thus doesn't absorb anything healthy from it. Others say that microwaving food properly actually preserves the nutrients better. Others say it is no better or worse that baking, boiling or any other type of cooking the food.

I am in the mindset that microwaving food isn't the worst thing you could do in your diet and to pick and choose your battles. If you want to take away something about cooking in a microwave (or any other cooking for that matter) is that the less you have to cook your food the better*.

*Of course you must cook certain foods completely to eliminate the bad things like E coli and Salmonella.

I would argue that more nutrients are lost to cooking on the stove top than are lost inside a microwave.

In the microwave, things are usually covered using plastic wrap or some similar air-tight seal. Because of this, nutrients aren't able to be carried away through evaporation and steam as easily as they are on a stove top. Evaporation and steam are the only ways I can think of for anything being lost.

Microwaves work using a process called dielectric heating, which put simply is where the molecules a piece of food is made up of rapidly rotate to align themselves to an alternating electromagnetic field which causes internal friction and heat. Imagine taking a compass and flipping it into the air as if you were flipping a coin, and what that would do to the needle inside the compass as it flipped through the air.

I'd think if anything, microwaves would work to break food down into the components it's made of and make it a tiny, though probably negligible, bit easier for the body to digest.

I agree. The only thing that I make sure I do when microwaving food is to not use plastic. I'm not sure if it is really true or not, but I've heard many times that when you microwave plastic in the microwave it releases cancer-causing agents into your food. I don't want to take the chance to get cancer if it is true, so I make sure I avoid using plastic.