I'm not really sure any more about my original point, but I'm still of the opinion that we as western citizens should reduce exploiting both nature and other people in order to protect our outrageous wealth and become even more obese and unhappy.
I question the whole notion of happiness as the ultimate goal of humanity.
Meanwhile, our obesity is caused by evolutionary maladapation. We now live in a world of extremely rich nutrient, but our body still carve fats, sugar, and carbohydrate to the detriment of our health.
As the world become more prosperous, we will face widespread obesity.