This website is a composite of many "no sugar, no flour" diets. The white stuff is definitely not good. You could make your own "Rice-a-Roni" with brown rice. Yes, all potatos are good....the serving size is 1/2 or 4 oz. I would think that air-popped popcorn would be fine depending on how it impacts you....some view it as a trigger food and avoid it.....I can't eat it myself....but that doesn't mean that it's all bad.
Have a great party!