Oh dear, definitely not a good idea. Eat something snack-y and then finish your grocery list and dinner list. But gosh, you're so organized! Whenever I go to the supermarket I'm like, "Hmm, what do we need?" And then I have to go back within a day because I forget the very thing that I went out to get. And dinner menu? Pssh, forget it. I tend to eat cereal for dinner at like eight-o-clock because I just forget to cook anything. Or because we have nothing to cook as a result of my forgetfulness at the grocery store.