I never said wealth == sickness. It's the primary driver for a nation's obesity. Africa isn't skinny because of a lack of processed food. It's because of a lack of *any* food. Given increased wealth, a large segment of the population will overeat. This doesn't mean avoiding processed food is bad, but if you eat a truckload of unprocessed food you will still get fat.

Among individuals, the wealthiest are usually more intelligent and there is a weak negative association between intelligence and obesity.