Even so, that can be reduced to twice a day if you cook in batches (i.e. have leftovers for lunch). That seems more optimal to me without compromising the healthy aspect.
I'll have my wok cleaned and put away for next time before the frozen pizza chefs have their oven preheated. Or I'll be half done eating my lunch salad before the frozen burrito comes out of the microwave.
I'm not sure that "open bag, dump salad on plate" even counts as cooking, but that's like 1/3 of my meals and the "cooking" process takes about 10 seconds.