That's a tricky one...personally I wouldn't weigh myself, I would however make a promise to myself not to overindulge. Anything in excess isn't good. But that doesn't mean you can't enjoy a piece of cake on your b-day! Just make sure whatever it is that you eat is portioned and try to substitute for healthier choices. Remember eliminate the word diet from your vocabulary this is a lifestyle. Just do what you would do on any other day. Hope my opinion is helpful to you.