I suspect food preservatives are enzyme blockers. This if true would sabotage absorbing anything but sugars and fats from your food. If you ate a high processed food diet, you could easily find yourself in a high calorie / low nutrition spiral to obesity.
You literally starve while over eating... You are full while craving more nutrients.
Excellent point.
You are not getting the nutrition you need when you fill up with processed foods, no matter how *fortified* it is.