So true. And once you start eating healthily, you lose your tolerance for the junk food! Both in taste and in how your body reacts to it. Things that I used to love as treats now no longer taste that good; on occasions where I've eaten out too much (I almost never eat out, so this came up years ago when I'd go to a weekend convention with friends, or when I traveled to a friend's wedding), my body has NOT been happy with me. At least when I went on the wedding trip, I had learned my lesson and was sure to at least bring the makings of my daily protein shake that keeps my blood sugar happy and is my daily breakfast, so I had a good start to my day even if lunch and dinner were less than optimal.
I wasn't sure if TSA was going to let me through with ziploc baggies of powder, since I mix my own protein shake from scratch ingredients, lol - but they did! I even went out and bought the Starbucks instant coffee because it comes in individual sealed packets (I mix it up with coffee), but the other ingredients were home-mixed, lol.