I don't think it matters here because rice doesn't really have 'nutritional value'. :p
I mean, the claim isn't about the speed of microwave cooking, but the method. When you heat something normally, heat hits the outside surface by radiation and convection of the surrounding gas, and the heat is conducted deeper into the item at a fairly slow rate.
When you microwave an item, microwaves travel straight through it from outside to inside, and as they do so they cause resonance in water molecules, which are taken from room temp to boiling or even superheated in moments when the surrounding matter is still cold and hasn't enough time to expand. This (is claimed) to be much more violent heating and consequently much more damaging than ordinary cooking.
Also, cooking does more than destroy heat sensitive vitamins - otherwise there wouldn't be any point in doing it if that was all it did. It changes enzymes and proteins and chemical bonds and all sorts. Of course there are people claiming much of this is less than healthy - and no you aren't going to eat raw rice as an alternative, so why would you eat cooked rice? Why not eat something you can eat raw instead?
I mean, the claim isn't about the speed of microwave cooking, but the method. When you heat something normally, heat hits the outside surface by radiation and convection of the surrounding gas, and the heat is conducted deeper into the item at a fairly slow rate.
When you microwave an item, microwaves travel straight through it from outside to inside, and as they do so they cause resonance in water molecules, which are taken from room temp to boiling or even superheated in moments when the surrounding matter is still cold and hasn't enough time to expand. This (is claimed) to be much more violent heating and consequently much more damaging than ordinary cooking.
Also, cooking does more than destroy heat sensitive vitamins - otherwise there wouldn't be any point in doing it if that was all it did. It changes enzymes and proteins and chemical bonds and all sorts. Of course there are people claiming much of this is less than healthy - and no you aren't going to eat raw rice as an alternative, so why would you eat cooked rice? Why not eat something you can eat raw instead?