'Big business' are mostly concerned about money.
Food, in terms of health benefits, has been left behind because most of the research and innovation is focused on being profitable.
The current system also fuels the pharmaceutical industry with so many clients. The need for the two best selling drugs, cholesterol, and diabetic medication is due to the foods we eat.
I don't think these industries set out to kill humanity, though. I do, however, feel, that, the deterioration of our health is a side effect of big business.
RE: Why People Were Skinnier 40 Years Ago, Part 1 (Video)