Maximum profit for Healthcare companies comes from people being chronically sick as soon as possible and remaining in that state (so, alive and uncured) for as long as possible.

As it so happens, American food quality (in terms of nutrition) is horrible, the regulatory environment when it comes to approving substances for contact with humans and even human consumption is appalling (it follows the "accepted until proven dangerous" principle rather than the precautionary principle followed in Europe) and pretty much anything goes when it comes to car pollution, so people end up with cardiovascular diseases and/or type II diabetes and/or all manner of cancers of the digestive and respiratory tracts quite early, so all the Healthcare sector needs to do is keep them alive as long as possible to extract the maximum amount of money from them.