> Daily/weekly needle injections is the only defense?

No, just the most effective one once you've got an obese population. (Nicotine patches aren't the solution to cigarette smoking. But they are a great tool for cigarette smokers.)

Barring changing one's own diet and activity-level? Seems so. Sadly, only one of these options takes 30 seconds and the US is quite the "Now, please" culture. [1]

1: Am an American. I want it now.