The subsidization by the government of horrible monoculture agriculture is a huge factor as well.

If wheat farmers that are spraying their crops with roundup at harvest time weren't getting subsidies they would be growing what the market actually wanted- like grass fed beef.

If the products that "should be regulated" weren't so artificially cheap (and engineered to be addictive) they wouldn't have as much market share.

Cutting off foodstamp access to processed foods would also help IMO

Pharma is another huge factor- you're right. They get customers for life and never cure anything