Peter Greenberg, self-proclaimed "travel detective", has a new book. "The Traveler's Diet" has tips and tricks for healthy living out of a suitcase. Here are a few:

At The Airport
Eat before you go
Get there early/do laps
Choose healthier fast food

Healthiest Airports
#1 Chicago O'Hare
#2 Detroit Metropolitan
#3 San Francisco

The Flight: Airplane Food
High in fat & calories
Drenched in mystery sauce
Easier to reheat
Makes people tired

At The Hotel
Ask that the mini bar to be locked/removed
Request a small fridge
Stay at hotels with healthy menus

Exercising on The Road
Call ahead and ask for gym/trainer
Meet trainer at check in
Workout right upon arrival

By the way, if you remember what Greenberg used to look like, compare it with his picture on the dust jacket. I think he's earned a lot of credibility!