Hi ladygonz,
Remember, if you just wanted to diet then it wouldn't matter if you held off until after your trip to get 'started'.
However, with a "lifestyle change" there's no better time like the present to get started.
Simply because no matter what, you need to learn how to make better choices throughout your life - including trips and holidays.
Enjoy yourself while in Mexico - but know that all that fun isn't necessarily caloric![]()