If you want to avoid gaining weight on a cruise, call the cruise line and ask them to send you a menu — or go online and print it out before your trip.
Create your own menu for the week from the existing cruise menu and stick to it when you go on your cruise. If you know what you’re planning on eating before you go on your trip, you’re less likely to eat foods that you normally try and stay away from. Sticking to your diet will stop you from feeling guilty about eating too much and help you relax.