If you mean, “Should I continue an existing diet/healthy habits I had for several weeks or months prior to vacation?” by all means, continue!
If you mean, “Will crash dieting and exercising like a maniac make me look lean for vacation?” then the answer is probably not.
Here’s why: A one or two week diet before vacation will cause you to shed mostly water weight and MAYBE a pound or two of actual body mass. You’ll look lean for your first day of vacation and by day two, after you’ve traveled, eaten a burger and poured back a margarita, you’ll be wondering why you’re bloated again. It’s just a given with extra salt and carbs in your diet and the change in your routine.
Personally I don’t think two weeks of starving and crazy workouts are worth it for one day of results and no long-term benefit. I wouldn’t do a two-week diet for the sole purpose of going on vacation.
If I happened to start a diet shortly before but unrelated to vacation, I would ease my way in and keep in mind that my results would be delayed because of my vacation.
When you return from vacation and notice bloating or a higher weight on the scale, don’t panic, don’t starve yourself, and don’t spend hours doing cardio. Your best bet is to drink a lot of water and get back to a healthy routine.
How do you prepare for vacation?