I'm from the U.K. originally and I regard US portions as typically about 3 or 4 meals.
Further, I've just managed to drop my weight from 188 to 168 lbs just by regarding this as a hard rule, and just generally eating a bit less than I need.
I do love the flavors and variety available in Texas - we seem to pull from a wide variety of cultures, at least in the big cities.
Flip-side, is that I can put more effort into having good food. I eat enough bread that I like to bake a loaf every week, and having fresh home-made wholewheat bread available is pretty nice.
I do enjoy 1/2 a banh mi, for lunch, a couple times a week, but otherwise I've had to pretty much stop eating Thai curry, as it's just too many calories, esp. when you consider a regular lunch special of soup and (small) dessert in addition.