Maintaining a diet on the road is difficult, but it can be done. Later this week, I'll share some of the things I do to try to contain the damage of eating out for 3 meals a day. Dining while traveling is worse. There's rarely time for a sit-down meal and, unless you get a first-class bump, getting anything substantial on a plane is virtually impossible.
For me the net result is that I'm typically hungry until we do dinner and I scavenge for the rest of the day (as evidenced in my diet log, above). I pack high-calorie bars. Clif Builder Bars are awesome, but I've lately been traveling with the available-at-Costco Clif bars (the old school ones), Kashi CRUNCH bars, and Zone bars. One of those and a bottle of water usually quiet my stomach for a while.
It's still never enough and the lack of proper nutrition certainly doesn't play nicely with the stress of travel, running on little sleep, and being in a giant petri dish for a significant portion of the day. The problem with eating healthy is that it's hard to find 3000 healthy Kcal in a day when for a significant portion of that time, you don't realistically have easy access to ANY food.
The result is that when dinner rolls around I'm hungry and my body is strongly craving everything (fat, carbs, protein) and my body wants to play catch-up. ...and more often than not, I let it. Right or wrong, I know that tomorrow is back on the work-out bandwagon for another 6 days and I'm going to need the energy! So get the food in, rehydrate, go to bed, get a good night's sleep, and get up ready to roll in the morning. Giddy-up.