Free market capitalism works really efficiently, except when externalities are present, at which point it efficiently exploits them to everyone's detriment. Your health is an externality to the corporations that make your food.
Brilliant. But completely incomprehensible to almost everyone.
"Sometimes it IS more profitable to poison your customers, even in the long-run."
Something like: Food is being deliberately engineered to be addictive, and that's causing obesity and illness.
Food companies spend a significant amount on R&D to maximize the taste and attractiveness, but not necessarily the nutrition, of their pre-packaged foods.