Hi susieb
I think there is always a reason to hold off on these things – an upcoming holiday/birthday/family get together etc. ect. ect. – tomorrow never comes! Better to start now and drop a few pounds and I think you will find that in the three weeks, your eating habits and appetite will be altered, so that you will automatically eat differently while you are away.
I am three weeks in (almost), have two meals out happening this w/e, a celebration for my daughter’s birthday next w/e and I go on holiday early April. However, as this is not just a diet, but is also about changing your eating habits from here on in, there was no good reason to postpone starting the diet when I did. Already, I find I don’t have the appetite I did before, I don’t get desperately hungry and need snacks, I don’t want sweet stuff anymore and 800 of the right calories is quite sustaining. So in three weeks time, you too could be looking at this transformation for yourself and be several pounds lighter too.
So go for it – take the bull by the horns and make that change!