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The defect of the definition of tCalories, as presented, is that, if you decide to use instance variables for gram content—fGrams, cGrams, and pGrams—instead of for calorie content, then you have to rewrite the tCalories definition, and perhaps many others, to use the new instance variables:

Food method definition • instance 
  ^ fGrams * 9 + cGrams * 4 + pGrams * 4