For example what do I have for breakfast? Oh let's boil and egg amd grab a carrot and corn on the cob. Or whatever.
What do I do in the supermarket? Meats, veg, bit of fruit maybe bit of dairy. Am I obessing over avacado vs. pear. Nope. Chicken vs. beef? No. Chocolate bar vs carrot? easy choice.
Now probably once you get thay square you can do harder stuff like food reaction / allergy testing and so on.