There is zero sugar in Grape-Nuts.
Also zero in Ezekial 4:9
Not wanting it to seem like an argument, but grape nuts does have sugar.
7 grams per half up. Look it up.
Just to mention the quinoa again for a moment. You can make up a big batch, it stays good for a few days. If you eat it you will be full for hours. It has a low glycemic index so you dont' have that spike.
An even better idea might be lentils. I love them any time. I like the red ones, they just have more eye appeal. They are extremely easy to make.
That's another food that you can make and eat over a few days.
You can mix yogurt with it, or some brown rice and you won't want any food until lunch. (I like curried lentils)
If I eat dried cereal, I do it as a snack at some time other than breakfast.
If I eat cereal for breakfast, I'm hungry in an hour, starving in 2.
I say stop buying processed foods in boxes and just cook up some legumes and have with wheat bread/toast. Complete protein.