It sucks to say it, but the default is overweight, dumb, and broke.
You don't live in a world where you have to hunt for your food and figure out how to survive.
You live in a world where - unless you decide to endlessly practice self-education, because schools do not teach you how to live a good life - you will automatically choose hyperpalatable foods, sit on your couch all day, and get the job that pays enough to survive because that's just what you were supposed to do.