I didn't do great at this myself when I use to travel for work, it's hard! But a few things that did help: on travel days, pack food or go to the grocery store before traveling, on the road/airport food is never worth the calories. I have even brought a salad with dressing on the side on the plane with no problems. Bring some healthy snacks that travel well for during the days ( granola bars, nuts) especially if you are in meetings or conferences where not-good-for-you-food is around. Start the day well with a healthy breakfast or workout, that way if you have a lunch or dinner where you have less control, you still had a good morning. I know when I traveled there were almost always drinks at night, so if I didn't work out first thing it didn't happen. There are some good workout clips on youtube if you are stuck somewhere without a gym, and a resistance band is easy to pack. I have found with this process that forcing myself to log food even if it is just 2 of 3 meals helps me stay mostly on track, even when I am not planning to eat healthy all day. Hope that helps!