Do you eat anything?

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Got a question... all MFP tells you are about the remaining cals ... and some detailed list... but in general... do you eat anything even white rice, white bread?... i mean...everything got calories right? so can i eat just everything to cover the calorie goal?... I know that people says, dont eat rice, dont eat white bread(just examples), because they are not good!... but i think they say that just because it doesnt give to your body, any nutrient, but still, is good for our body since it is fuel right?... and if you exercise, there wont be any problem at all... am i missing something?