bah, theres no excuse that you have to eat fast food.
while i was in college i worked 3 jobs -- weeknights at an auto body shop, weekends unloading trucks at purolator courier, and extreme late tuesday and thursday nights driving cars back from the auction for a car dealer friend of mine. on sunday evening i cooked huge pots of chili, stews, etc. i froze them in serving size tupperware, and when i was heading out i grabbed one, chucked it in a little lunchbox-sized soft cooler with some drinks and fruit and off i went. it would keep everything cool during the day and when i had time for lunch id pop em in the microwave and have a hearty yet healthy meal.
you could do the same by making sandwiches the night before, or hell even if you pick up some of those stouffers's or michelina's or whatever frozen entrees you are still better off then eating big macs and whoppers :)

...and knowing i wasnt eating any partially defatted beef fatty tissue, mechanically separated chicken, pork by-product, beef tripe, or any of today's charming ingredients was a bonus :)