True, that's also the case with me. Especially when i get home late and have been at the gym. I'm like FOOD!! I NEED FOOD!! NOW!!! and i end up grabbing whatever is available.
What i'll do though when i do cook is i'll cook a whole big pot of something and then freeze/refrigerate it in portion sized containers and then i dont have to cook for a while, and just take the container along for lunch or grab it for dinner. The downside of that though is that my lunches and dinners end up being the same thing for a few days (unless i make a bunch of different dishes in a big cooking spree). It usually tastes so good that i dont mind that much, but it does get boring after a while...