This article has some data that one doctor-nutritionist gave to me. I remember mentioning an aspect of this in the Lounge and someone said it wasn't true. But this is the first I've seen it in writing in the same way.
The higher the power creates the most destruction naturally. But most cook in a MV at high power. Still, the less you cook your food the better off you are. Even if carrots have more nutrition heated, you try to have some raw too.
I have another one but you have to be registered and it's has a reference to a peer reviewed paper.