Nutrition is much more than calories, fat and protein.  It is the combination of all those plus the pesticides, toxic metals and most importantly the full spectrum of nutrients provided by the food and diet.  The higher the nutrient density of the food the lower will be the pesticide residue and toxic metals.  The higher the nutrient density, the better will be the taste and shelf life of the food, naturally.
        When buying foods, note how they look, smell, feel and store in the fridge.  The better the nutrient quality, the better they will cook and smell.  Ultimately how they taste and make you feel after eating them (not being hungry immediately after consuming) are the more important parameters of food quality.  Keep a tab on the foods you buy, noting these characteristics and demand better from your produce department.