First of all, I hope everyone has a good Christmas and enjoys themselves as much as they can. I know it is a time for much thanksgiving for many of us.
It is also a time when food and drink gets consumed in greater quantities than normal (and sometimes at less frequent intervals, or in richer, sweeter forms). It is worth remembering that many of us do not actually have the option of having those days off from our diet regime that weight-reducing dieters might be tempted to enjoy. So, much as we like the things we can no longer cope with, our digestive system does not recognise special occasions. Do not forget to take it steady!
For those not at home, it is sometimes worth trying to explain to generous hosts that eating small quantities of their food, or eating a small snack in between the big meal times, is not a reflection of your enjoyment of their hospitality. Other people do have great difficulty in understanding what we can cope with - we have enough difficulty ourselves! But a little bit of advance planning and explanation can make all the difference!
Have a good time!