You've just had an extensive brunch at your parents' house, when your mother-in-law puts all kinds of tasty snacks on the table. You almost feel obliged to socialize, but really:saying no is allowed.
Cosiness
Food is often associated with conviviality and conviviality is the main ingredient of Christmas. Let your (in-law) family notice that you can also have a lot of fun without eating along.
Pranksters
Maybe a family member starts making silly jokes if you skip a round of appetizers. Don't worry about it. There are probably plenty of people who wish they had the discipline to refuse tasty things.
Servings
Watch the portions you take. For example, scoop up a little less. Eat slowly and enjoy the taste.
Enjoy
You really don't have to refuse all snacks if you watch the line. Enjoyment is more important. You can always plan a balance day after Christmas. Tips for planning a balance day.
Be persuasive
No is no. People want the company to eat with them. Be resolute:you don't have to, but it's fine with everyone else eating.
Do you think about the leash at Christmas?