Why isn't the richest country in the world the healthiest country in the world?

A new study found that Americans are sicker than the English.

The study, appearing in Wednesday's Journal of the American Medical Association, adds context to the already-known fact that the United States spends more on health care than any other industrialized nation, yet trails in rankings of life expectancy.

The United States spends about $5,200 per person on health care while England spends about half that in adjusted dollars.
...
The upper crust in both countries was healthier than middle-class and low-income people in the same country. But richer Americans' health status resembled the health of the low-income British.

I've seen what they eat, how is that possible?