My experience of MFP is that not all the foods listed have their vitamins and minerals listed in full - it's useful for counting cals and macros (I found it really helpful when I started and was learning how much food I needed to eat to get enough protein), but it's incomplete re micronutrients.
You absolutely do not suffer from excluding cornflakes:
Paleo vs. Standard American Diet
Kids, Paleo and Nutrient Density
Mathieu Lalonde, PhD