I travel a lot. Just to give you an example of how I maintain healthy habits when on the road: While I was cooking breakfast and checking morning email before a trip, I cooked a double meal (steamed frozen wild Salmon; frozen collard greens nuked in a covered bowl with a TEAspoon olive oil, dried basil, nonsalt seasoning, and basalmic vinegar (not vinagreETTE); brown rice). I ate 1/2 for lunch before I left, and the rest for dinner shortly before the plane landed. The folk on the plane were jealous – and I wasn’t tempted by chips and cookies on the plane.
Oh, and I had my bags of green tea as well.
BTW, be sure to stay hydrated and get up and move around on long flights. Overweight and obese people are more likely to have blood clots on long flights – that appears to be what killed rapper Heavy D.