It is not that the world is unhealthy per se...But there is lots of unhealthy temptation around as well as unhealthy environments. There are many ways to eat better, exercise, avoid unhealthy places, and take care of yourself in simple ways.
The food situation is a big one. Must one purchase everything organic to be healthy? What are the most important products to purchase organic? Dairy products take front and center. Purchasing organic dairy products you are avoiding many unhealthy hormones.
When dining out stay away from the smoking areas, soon that won't even be an issue as everyplace will be smoke free soon. Make wise selections and give some thought to making those splurges. My favorite rule is always eat what you love or don't waste the calories.
Do some studying into supplements and vitamins and research what might be best for you in for any lacks you may have. Also talk with your health provider before embarking on a new regime.