Inverted Relationship Fast Food and Age

Why does it seem that the older you get the less fast food you eat? I've noticed over the years that in each year that I get the older, the less I'm able to stand the taste of fast food. Its at a point now that I'd almost rather come home and eat crackers than stop and pickup one of those combos.....

Possible theories on this phenomenon....

1. I'm sick of getting my orders screwed up and begging for extra ketchup.

2. Foods are more processed than ever before and they taste terrible.

3. In the age of information, I've been exposed to too much "behind the scenes" info on what really goes on in restaurant kitchens...thanks Anthony Bourdain! thanks Food Inc.! thanks Super-Size Me!

4. The older I get, the more I'm aware of my mortality, thus making me more health conscience and focused on taking care of my body.

5. Times are tough, save the $6 bucks on a combo meal and sack lunch a ham "sammich"...hey it adds up!

Any suggestions? What do you think?