ENGL 1A College Class - Thesis for Fast Food Trends

Hey EssayForum, I am writing up a research paper for past trends in the fast food industry. The directions for a research paper are pretty simple.

My current thesis is:
Since the spark of the fast food industry, there have been three significant trends: a health, up scaling, and advertising trend.

Any suggestions for revision? The three trends are health and nutrition, upscale and casual dining, and marketing and advertisement trends. My paper will cover these three trends.

Well, one thing is for sure that when one fast food chain develops a hot new menu item, the others are sure to follow with a bigger, better, 6 cent cheaper one! It is interesting and somewhat amusing that with diabetes and obesity in Americans of all ages on the rise, the greasy giants have attempted to create "healthy alternatives" such as apple slices instead of fries. (My son laughed in my face quite maniacally when I suggested he opt for the apples in his happy meal one day.) Did you know that the psychology of strategically marketing, advertising and keeping customers is so deep that at least 2 of the largest chains have a "trademark scent" that they use in their establishments? And since smell is the sense most closely tied to memory, it is no wonder that stepping foot into a certain Golden Arch, no matter the level of cynicism or shame I feel upon doing so, I am filled nostalgic feelings and fond chilhood flashbacks. So these are the first things that came to mind for me, you are obviously welcome to any of these ideas. As far as structure goes, your best bet would be to crank out a rough draft and then send it to me in a reply, we'll go from there if you like. I hope this is helpful!