People fall off such programs quite often or find they can t live with a crash plan and regain whatever they lose. Please don t interpret this as advise not to improve your eating, activity, and weight. I do urge you to make sensible changes but ones you can live with long after the reunion. People you like will like you back, so the reunion can be fun no matter what you weigh. It can be a stimulus to get started with lifestyle change, but should not be a signal to be crazed with dieting.
People lose weight in different ways.
There is no best way to lose weight, rather we strive for the best match between people and approaches. You might consider shopping around to find a program that matches your needs and personality. If you feel you can do it on your own, there are helpful resources available for eating healthy and controlling weight. This site provides nutrition tips but also explains how to get an excellent guide for healthy eating a book called The American Dietetic Association s Food and Nutrition Guide. The good news is that modest amounts of activity can be a real help.