Things that damage the economy indirectly.
For example I feel that fast food and an unhealthy lifestyle leads chronic health problems that probably affects the economy not just monetarily.
Of course we can't just deny these people care, just promote a healthier lifestyle.
What are other things that we can change that will affect the economy in a positive way?
I totally agree that not eating right can indirectly contribute to economic problems. Other things people hardly take notice of is negativity especially negative news. Avoid negative news as much as you can. Put your mind on positive things that matter.
You could check the news headlines once in a while but don't dwell on the contents. If you must read news, read those that do not cause you to hate things you do not understand. Read news that have balanced reportage... not those pretending to be balanced. Hate and Bitterness blind people from truth. When you're told somebody is evil by media, hear from that person before jumping into conclusion. Do thorough investigation. Your investigations will always surprise you. When most people on earth begin to investigate news before believing, we will probably experience some peace in this world.
If you can handle negative news that's fine.