I don't really like articles like "True cost of X" where X is some type of activity, behavior, etc. I think it's just trying to find someone (or group of people) to blame.
How about we all look at the 'true cost' of our modern lives. Having electricity and water on demand. The ability to see our bodily 'waste' and household 'waste' disappear. The ability to go to the store and purchase food in cans, boxes, or fresh fruits and vegetables out of season any time of the year. The ability to purchase all sorts of what I think of as 'junk' to 'enrich' our lives. To strap ourselves into a complicated piece of metal and plastic and drive around on concrete and asphalt at high speeds.
The list goes on.
I'd rather look at what obesity does to a person on a personal level and attempt to help that individual (if they want it) rather than look at what it supposedly does to the rest of the world.
Do what you want as long as it harms no one else.